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{{Use dmy dates|date=October 2019}}
{{DISPLAYTITLE:{{mp|(48639) 1995 TL|8}}}}
{{DISPLAYTITLE:{{mp|(48639) 1995 TL|8}}}}
{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
| background = #FFFFC0
| name = {{mp|(48639) 1995 TL|8}}
| name = {{mp|(48639) 1995 TL|8}}
| background = #C2E0FF
| image = 1995TL8-satellite-discovery.jpg
| discoverer = [[Arianna E. Gleason|A. Gleason]] ([[Spacewatch]])
| image_scale =
| discovered = 15 October 1995 and<br>9 November 2002 (''moon'')
| mp_name = {{mp|(48639) 1995 TL|8}}
| caption = {{mp|1995 TL|8}} and its satellite (unresolved) imaged by the [[Hubble Space Telescope]]
| discovery_ref = <ref name="jpldata" /><ref name="MPC-object" />
| alt_names = ''none''
| discoverer = A. Gleason {{small|([[Spacewatch]])}}
| mp_category = [[Classical Kuiper belt object|Classical]] ([[Deep Ecliptic Survey|DES]])<ref name="Buie" />
| discovery_site = {{nowrap|[[Kitt Peak National Observatory|Kitt Peak National Obs.]]}}
| orbit_ref =  <ref name="jpldata" />
| discovered = 15 October 1995
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5)
| semimajor = {{Convert|52.358|AU|Tm|abbr=on}}
| mpc_name = {{mp|(48639) 1995 TL|8}}
| perihelion = {{Convert|40.085|AU|Tm|abbr=on}}
| alt_names = {{mp|1995 TL|8}}
| pronounced =
| aphelion = {{Convert|64.631|AU|Tm|abbr=on|lk=on}}
| named_after = <!-- [[xafter]]<br />{{small|(descr.)}} -->
| eccentricity = 0.23441
| mp_category = [[Trans-Neptunian object|TNO]]<ref name="jpldata" />{{·}}Other TNO<ref name="johnstonsarchive-TNO-list" /><br />[[Detached objects|detached]]<ref name="Buie" />{{·}}[[Distant minor planet|distant]]<ref name="MPC-object" />
| period = 378.86 [[Julian year (astronomy)|yr]] (138378 [[Julian year (astronomy)|d]])
| inclination = 0.24457°
| orbit_ref = <ref name="jpldata" />
| asc_node = 260.76°
| epoch = 17 December 2020 ([[Julian day|JD]] 2459200.5)
| arg_peri = 83.906°
| uncertainty = 2
| observation_arc = 25.26 yr (9,225 days)
| mean_anomaly = 42.652[[Degree (angle)|°]]
| avg_speed = 4.06 km/s
| aphelion = 65.218 [[Astronomical unit|AU]]
| satellites = 1
| perihelion = 39.937 AU
| semimajor = 52.578 AU
| dimensions = ≈ 350 (primary)<br>and ≈160 km (secondary)
| mass =
| eccentricity = 0.2404
| period = 381.25 [[Julian year (astronomy)|yr]] (139,251 days)
| density =
| mean_anomaly = 46.972[[Degree (angle)|°]]
| surface_grav =
| mean_motion = {{Deg2DMS|0.0026|sup=ms}} / day
| escape_velocity =
| sidereal_day =
| inclination = 0.2499°
| spectral_type =
| asc_node = 260.007°
| abs_magnitude = 5.4
| arg_peri = 84.397°
| albedo = 0.09 (assumed)
| satellites = 1 (D: 80 km)<ref name="johnstonsarchive" />
| dimensions = 176 km<ref name="johnstonsarchive" /><br />420.27 km {{small|(calculated)}}<ref name="lcdb" /><br />495 km {{small|(estimated)}}<ref name="Brown-dplist" />
| single_temperature= ≈ 38 [[kelvin|K]]
| mean_motion = {{Deg2DMS|0.0026016|sup=ms}} / day
| rotation =
| albedo = 0.07 {{small|(estimated)}}<ref name="Brown-dplist" /><br />0.10 {{small|(assumed)}}<ref name="lcdb" /><br />0.369<ref name="johnstonsarchive" />
| observation_arc = 4702 days (12.87 yr)
| spectral_type = [[Trans-Neptunian object#Colours|RR]]<ref name="Belskaya-2015" />{{·}}[[C-type asteroid|C]] {{small|(assumed)}}<ref name="lcdb" />
| uncertainty = 4
| abs_magnitude = {{val|4.667|0.091}} {{small|(R)}}<ref name="Peixinho-2012" />{{·}}4.8<ref name="jpldata" /><ref name="lcdb" />{{·}}5.1<ref name="Brown-dplist" />{{·}}{{val|5.290|0.060}}{{efn|name=lcdb-Lellouch-2013}}
| moid = {{Convert|39.0755|AU|Tm|abbr=on}}
| jupiter_moid = {{Convert|35.0968|AU|Tm|abbr=on}}
}}
}}


'''{{mp|(48639) 1995 TL|8}}''' is a binary [[trans-Neptunian object]] from the [[scattered disc]] in the outermost regions of the [[Solar System]]. It was discovered by Arianna Gleason in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer [[minor-planet moon]], provisionally designated {{mp|S/2002 (48639) 1}}, was discovered on 9 November 2002.<ref name="johnstonsarchive" />
'''{{mp|(48639) 1995 TL|8}}''' (also written '''(48639) 1995 TL8''') is a [[classical Kuiper belt object]] possessing a relatively large satellite.

The assumed diameter of {{convert|352|km|mi}} is derived from an [[albedo]] guess of 0.09, being typical for [[trans-Neptunian object]]s.<ref name="johnston" />


== Discovery ==
== Discovery ==


{{mp|1995 TL|8}} was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of [[University of Arizona|UA]]'s [[Spacewatch]] survey at [[Kitt Peak National Observatory]], near Tucson, Arizona.<ref name="MPC-object" />
Discovered in 1995 by Arianna Gleason as part of the [[Spacewatch]] project, it was the first of the bodies presently classified as a [[scattered disc|scattered-disc object]] (SDO) to be discovered, preceding the SDO prototype {{mpl|(15874) 1996 TL|66}} by almost a year.


It was the first of the bodies presently classified as a [[scattered-disc object]] (SDO)<ref name="johnstonsarchive-TNO-list"/>{{failed verification|date=March 2021}} to be discovered, preceding the SDO prototype {{mpl|(15874) 1996 TL|66}} by almost a year.{{citation needed|date=November 2017}}
==Satellite==
[[Image:1995 TL8 binary-earth comparison.jpg|thumb|800px|none|A relative size and distance comparison of the '''(48639) 1995 TL<sub>8</sub>''' system with the [[Earth]]–[[Moon]] system. The scale of the Earth–Moon system has been reduced so Earth appears the same size as the '''(48639) 1995 TL<sub>8</sub>''' primary.]]


== Satellite ==
A companion was discovered by [[Denise C. Stephens]] and [[Keith S. Noll]], from observations with the [[Hubble Space Telescope]] taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated '''S/2002 (48639) 1''', is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about {{convert|420|km|mi}} to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of {{convert|161|km|mi}}.<ref name="TL8" />
[[File:1995TL8.gif|thumb|left|Animation of two Hubble images of {{mp|1995 TL|8}}'s satellite in August 2001]]
A companion was discovered by [[Denise Stephens|Denise C. Stephens]] and Keith S. Noll, from observations with the [[Hubble Space Telescope]] taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated {{mp|S/2002 (48639) 1}}, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about {{convert|420|km|mi}} to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of {{convert|161|km|mi}}.<ref name="johnstonsarchive" />

{{clear|left}}
[[File:1995 TL8 binary-earth comparison.jpg|thumb|900px|none|A relative size and distance comparison of the {{mp|1995 TL|8}} system with the [[Earth]]–[[Moon]] system. The scale of the Earth–Moon system has been reduced so Earth appears the same size as the {{mp|1995 TL|8}} primary.]]
{{clear|left}}


== Scattered–extended object ==
== Scattered–extended object ==


{{mp|(48639) 1995 TL|8}} is classified as [[Detached object|scattered–extended]] by the [[Deep Ecliptic Survey]] (DES), since its orbit appears to be beyond significant gravitational [[Perturbation (astronomy)|interactions]] with [[Neptune]]'s current orbit.<ref name="Buie" /> However, if Neptune [[Formation and evolution of the Solar System#Planetary migration|migrated outward]], there would have been a period when Neptune had a higher eccentricity.
{{mp|1995 TL|8}} is classified as [[detached object]] (scattered–extended) by the [[Deep Ecliptic Survey]], since its orbit appears to be beyond significant gravitational [[Perturbation (astronomy)|interactions]] with [[Neptune]]'s current orbit.<ref name="Buie" /> However, if Neptune [[Formation and evolution of the Solar System#Planetary migration|migrated outward]], there would have been a period when Neptune had a higher eccentricity.


Simulations made in 2007 show that {{mp|1995 TL|8}} appears to have less than a 1% chance of being in a 3:7 [[Resonant trans-Neptunian object|resonance]] with Neptune, but it does [[Orbital resonance#Coincidental 'near' ratios of mean motion|execute circulations near this resonance]].<ref name="Emel'Yanenko-2008" />
[[Image:1995 TL8 AnimLong.gif|350px|thumb|none|The [[Orbital resonance#Coincidental 'near' ratios of mean motion|near]] 3:7 resonance pattern of {{mp|1995 TL|8}} with [[Neptune]] only moves clockwise. It never halts and reverses course (i.e. [[(131696) 2001 XT254|librates]]).]]


{{multiple image
Simulations by Emel’yanenko and Kiseleva in 2007 show that {{mp|(48639) 1995 TL|8}} appears to have less than a 1% chance of being in a 3:7 [[Resonant trans-Neptunian object|resonance]] with Neptune, but it does [[Orbital resonance#Coincidental 'near' ratios of mean motion|execute circulations near this resonance]].<ref name="Emel2008" />
|direction = horizontal
|align = left
|width1 = 190
|width2 = 280
|image1 = 1995 TL8 AnimLong.gif
|image2 = 1995TL8 Orbital Period.jpg
|footer = ''Left:'' The [[Orbital resonance#Coincidental 'near' ratios of mean motion|near]] 3:7 resonance pattern of {{mp|1995 TL|8}} with [[Neptune]] only moves clockwise. It never halts and reverses course (i.e. [[(131696) 2001 XT254|librates]]).<br />''Right'': The orbital period of {{mp|1995 TL|8}} missing the 7:3 (2.333) resonance of Neptune
}}
{{clear|left}}


== Numbering and naming ==
It has been observed 48 times and has an orbit quality code of 4 (0 being best; 9 being worst).<ref name="jpldata" />


This [[minor planet]] was [[Minor planet designation|numbered]] by the [[Minor Planet Center]] on 20 November 2002.<ref name="MPC-Circulars-Archive" /> As of 2018, it has not been [[List of named minor planets (alphabetical)|named]].<ref name="MPC-object" />
[[Image:1995TL8 Orbital Period.jpg|400px|thumb|none|The orbital period of 1995 TL<sub>8</sub> missing the 7:3 (2.333) resonance of Neptune.]]


== See also ==
== See also ==
* [[3753 Cruithne]] (orbital circulations due to near resonant perturbations with [[Earth]])
* [[3753 Cruithne]] (orbital circulations due to near resonant perturbations with [[Earth]])
* {{mpl|(131696) 2001 XT|254}} - to see a proper 3:7 resonance with [[Neptune]]
* {{mpl|(131696) 2001 XT|254}} – to see a proper 3:7 resonance with [[Neptune]]

== Notes ==
{{notelist|refs=

{{efn|name=lcdb-Lellouch-2013|1=Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of {{val|5.290|0.060}}. Summary figures for (48639) at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=48639%7C LCDB] not found at ADS ([http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...557...60L 2013A&A...557...60L])}}

}} <!-- end of notelist -->


== References ==
== References ==
{{reflist
{{reflist|30em|refs=

|refs=
<ref name="jpldata">{{cite web
|type = 2021-01-16 last obs.
|title = JPL Small-Body Database Browser: 48639 (1995 TL8)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2048639
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 14 March 2021}}</ref>

<ref name="MPC-object">{{cite web
|title = 48639 (1995 TL8)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=48639
|accessdate = 16 November 2017}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 24 February 2018}}</ref>

<ref name="johnstonsarchive">{{cite web
|title = Asteroids with Satellites Database – (48639) 1995 TL8
|work = Johnston's Archive
|date = 21 September 2014
|author = Johnston, Wm. Robert
|url = http://www.johnstonsarchive.net/astro/astmoons/am-48639.html
|accessdate = 16 November 2017}}</ref>

<ref name="johnstonsarchive-TNO-list">{{cite web
|title = List of Known Trans-Neptunian Objects
|work = Johnston's Archive
|date = 15 October 2017
|author = Johnston, Wm. Robert
|url = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 16 November 2017}}</ref>

<ref name="Brown-dplist">{{cite web
|title = How many dwarf planets are there in the outer solar system?
|publisher = [[California Institute of Technology]]
|author = Michael E. Brown
|url = http://web.gps.caltech.edu/~mbrown/dps.html
|accessdate = 16 November 2017}}</ref>


<ref name="Buie">{{cite web
<ref name="Buie">{{cite web
Line 81: Line 141:
|accessdate=2009-01-26}}</ref>
|accessdate=2009-01-26}}</ref>


<ref name="jpldata">{{cite web
<ref name="Emel'Yanenko-2008">{{Cite journal
|first1 = V. V. |last1 = Emel'Yanenko
|date=2008-08-29 |type=last obs
|first2 = E. L. |last2 = Kiseleva
|title=JPL Small-Body Database Browser: 48639 (1995 TL8)
|date = April 2008
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48639
|title = Resonant motion of trans-Neptunian objects in high-eccentricity orbits
|accessdate=6 April 2016}}</ref>
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008AstL...34..271E
|journal = Astronomy Letters
|volume = 34
|issue = 4
|pages = 271–279
|bibcode = 2008AstL...34..271E
|doi = 10.1134/S1063773708040075
|s2cid = 122634598
|access-date= 16 November 2017}}</ref>


<ref name="johnston">{{cite web
<ref name="lcdb">{{cite web
|title = LCDB Data for (48639)
|date=22 August 2008
|publisher = Asteroid Lightcurve Database (LCDB)
|title=List of Known Trans-Neptunian Objects
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=48639%7C
|publisher=Johnston's Archive
|accessdate = 16 November 2017}}</ref>
|author=Wm. Robert Johnston
|url=http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate=2009-01-26|archiveurl=https://web.archive.org/web/20090213132019/http://johnstonsarchive.net/astro/tnoslist.html|archivedate=13 February 2009<!--Added by DASHBot-->}}</ref>


<ref name="TL8">{{cite web
<ref name="Peixinho-2012">{{cite journal
|first1 = N. |last1 = Peixinho
|date=2005-10-09
|first2 = A. |last2 = Delsanti
|title=(48639) 1995 TL8
|first3 = A. |last3 = Guilbert-Lepoutre
|publisher=Johnston's Archive
|first4 = R. |last4 = Gafeira
|author=Wm. Robert Johnston
|first5 = P. |last5 = Lacerda
|url=http://www.johnstonsarchive.net/astro/astmoons/am-48639.html
|date = October 2012
|accessdate=2006-02-07|archiveurl=https://web.archive.org/web/20051210221537/http://www.johnstonsarchive.net/astro/astmoons/am-48639.html|archivedate=10 December 2005<!--Added by DASHBot-->}}</ref>
|title = The bimodal colors of Centaurs and small Kuiper belt objects
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A..86P
|journal = Astronomy and Astrophysics
|volume = 546
|page = 12
|bibcode = 2012A&A...546A..86P
|doi = 10.1051/0004-6361/201219057
|arxiv = 1206.3153
|s2cid = 55876118
|access-date= 16 November 2017}}</ref>


<ref name="Emel2008">{{cite journal
<ref name="Belskaya-2015">{{Cite journal
|first1 = Irina N. |last1 = Belskaya
|last=Emel’yanenko|first=V. V|author2=Kiseleva, E. L.
|first2 = Maria A. |last2 = Barucci
|title=Resonant motion of trans-Neptunian objects in high-eccentricity orbits
|first3 = Marcello |last3 = Fulchignoni
|journal=Astronomy Letters
|first4 = Anatolij N. |last4 = Dovgopol
|volume=34|pages=271–279|date=2008
|date = April 2015
|doi=10.1134/S1063773708040075
|title = Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo
|bibcode=2008AstL...34..271E
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..250..482B
|issue=4}}</ref>
|journal = Icarus
|volume = 250
|pages = 482–491
|bibcode = 2015Icar..250..482B
|doi = 10.1016/j.icarus.2014.12.004
|access-date= 16 November 2016}}</ref>


}} <!-- end of reflist -->
}} <!-- end of reflist -->


== External links ==
== External links ==
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48639;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=48639 Horizons Ephemeris]
* [http://www.cfa.harvard.edu/iau/mpec/J99/J99L24.html 1999 MPEC listing]
* [http://www.cfa.harvard.edu/iau/mpec/J99/J99L24.html 1999 MPEC listing]
* [http://www.cfa.harvard.edu/iau/mpec/K00/K00Q15.html 2000 MPEC listing]
* [http://www.cfa.harvard.edu/iau/mpec/K00/K00Q15.html 2000 MPEC listing]
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
* [http://www.cfa.harvard.edu/iau/lists/MPLists.html IAU minor planet lists]
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs045001.html Discovery Circumstances: Numbered Minor Planets (45001)-(50000)] – Minor Planet Center
* {{JPL small body|id=48639}}
* {{AstDys|48639}}
* {{JPL small body}}


{{Minor planets navigator|(48638) 1995 TB|PageName={{mp|(48639) 1995 TL|8}}|(48640) 1995 UD}}
{{Trans-Neptunian objects}}
{{Trans-Neptunian objects}}
{{Minor planets navigator | |number=48639 |PageName={{mp|(48639) 1995 TL|8}} | }}
{{Small Solar System bodies}}
{{Small Solar System bodies}}
{{Dwarf planets}}
{{Authority control}}


{{DEFAULTSORT:048639}}
{{DEFAULTSORT:1995 TL8}}
[[Category:Scattered disc and detached objects]]
[[Category:Scattered disc and detached objects|048639]]
[[Category:Binary trans-Neptunian objects]]
[[Category:Discoveries by Arianna E. Gleason]]
[[Category:Possible dwarf planets]]
[[Category:Binary trans-Neptunian objects|048639]]
[[Category:Astronomical objects discovered in 1995|19951015]]
[[Category:Astronomical objects discovered in 1995|19951015]]
[[Category:Astronomical objects discovered in 2002|20021109]]
[[Category:Astronomical objects discovered in 2002|20021109]]
[[Category:Numbered minor planets]]
[[Category:Discoveries by Denise C. Stephens|1995 TL8]]

Revision as of 02:08, 6 March 2024

(48639) 1995 TL8
1995 TL8 and its satellite (unresolved) imaged by the Hubble Space Telescope
Discovery[1][2]
Discovered byA. Gleason (Spacewatch)
Discovery siteKitt Peak National Obs.
Discovery date15 October 1995
Designations
(48639) 1995 TL8
1995 TL8
TNO[1] · Other TNO[3]
detached[4] · distant[2]
Orbital characteristics[1]
Epoch 17 December 2020 (JD 2459200.5)
Uncertainty parameter 2
Observation arc25.26 yr (9,225 days)
Aphelion65.218 AU
Perihelion39.937 AU
52.578 AU
Eccentricity0.2404
381.25 yr (139,251 days)
46.972°
0° 0m 9.36s / day
Inclination0.2499°
260.007°
84.397°
Known satellites1 (D: 80 km)[5]
Physical characteristics
Dimensions176 km[5]
420.27 km (calculated)[6]
495 km (estimated)[7]
0.07 (estimated)[7]
0.10 (assumed)[6]
0.369[5]
RR[8] · C (assumed)[6]
4.667±0.091 (R)[9] · 4.8[1][6] · 5.1[7] · 5.290±0.060[a]

(48639) 1995 TL8 is a binary trans-Neptunian object from the scattered disc in the outermost regions of the Solar System. It was discovered by Arianna Gleason in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer minor-planet moon, provisionally designated S/2002 (48639) 1, was discovered on 9 November 2002.[5]

Discovery

1995 TL8 was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of UA's Spacewatch survey at Kitt Peak National Observatory, near Tucson, Arizona.[2]

It was the first of the bodies presently classified as a scattered-disc object (SDO)[3][failed verification] to be discovered, preceding the SDO prototype (15874) 1996 TL66 by almost a year.[citation needed]

Satellite

Animation of two Hubble images of 1995 TL8's satellite in August 2001

A companion was discovered by Denise C. Stephens and Keith S. Noll, from observations with the Hubble Space Telescope taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated S/2002 (48639) 1, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about 420 kilometres (260 mi) to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of 161 kilometres (100 mi).[5]

A relative size and distance comparison of the 1995 TL8 system with the Earth–Moon system. The scale of the Earth–Moon system has been reduced so Earth appears the same size as the 1995 TL8 primary.

Scattered–extended object

1995 TL8 is classified as detached object (scattered–extended) by the Deep Ecliptic Survey, since its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.[4] However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.

Simulations made in 2007 show that 1995 TL8 appears to have less than a 1% chance of being in a 3:7 resonance with Neptune, but it does execute circulations near this resonance.[10]

Left: The near 3:7 resonance pattern of 1995 TL8 with Neptune only moves clockwise. It never halts and reverses course (i.e. librates).
Right: The orbital period of 1995 TL8 missing the 7:3 (2.333) resonance of Neptune

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 20 November 2002.[11] As of 2018, it has not been named.[2]

See also

Notes

  1. ^ Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of 5.290±0.060. Summary figures for (48639) at LCDB not found at ADS (2013A&A...557...60L)

References

  1. ^ a b c d "JPL Small-Body Database Browser: 48639 (1995 TL8)" (2021-01-16 last obs.). Jet Propulsion Laboratory. Retrieved 14 March 2021.
  2. ^ a b c d "48639 (1995 TL8)". Minor Planet Center. Retrieved 16 November 2017.
  3. ^ a b Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 16 November 2017.
  4. ^ a b Marc W. Buie (22 October 2003). "Orbit Fit and Astrometric record for 48639". SwRI (Space Science Department). Retrieved 26 January 2009.
  5. ^ a b c d e Johnston, Wm. Robert (21 September 2014). "Asteroids with Satellites Database – (48639) 1995 TL8". Johnston's Archive. Retrieved 16 November 2017.
  6. ^ a b c d "LCDB Data for (48639)". Asteroid Lightcurve Database (LCDB). Retrieved 16 November 2017.
  7. ^ a b c Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 16 November 2017.
  8. ^ Belskaya, Irina N.; Barucci, Maria A.; Fulchignoni, Marcello; Dovgopol, Anatolij N. (April 2015). "Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo". Icarus. 250: 482–491. Bibcode:2015Icar..250..482B. doi:10.1016/j.icarus.2014.12.004. Retrieved 16 November 2016.
  9. ^ Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects". Astronomy and Astrophysics. 546: 12. arXiv:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. S2CID 55876118. Retrieved 16 November 2017.
  10. ^ Emel'Yanenko, V. V.; Kiseleva, E. L. (April 2008). "Resonant motion of trans-Neptunian objects in high-eccentricity orbits". Astronomy Letters. 34 (4): 271–279. Bibcode:2008AstL...34..271E. doi:10.1134/S1063773708040075. S2CID 122634598. Retrieved 16 November 2017.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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