(48639) 1995 TL8

Trans-Neptunian binary October 2019 yes (48639) 1995 TL 8 #C2E0FF 1995TL8-satellite-discovery.jpg 1995 TL 8 and its satellite (unresolved) imaged by the Hubble Space Telescope A. Gleason (Spacewatch) Kitt Peak National Obs. 15 October 1995 (48639) 1995 TL 8 TNOOther TNOdetacheddistant 17 December 2020 (JD 2459200.5) 2 25.26 yr (9,225 days) 65.218 AU 39.937 AU 52.578 AU 0.2404 381.25 yr (139,251 days) 46.972° 0.0026 ms / day 0.2499° 260.007° 84.397° 1 (D: 80 km) 176 km420.27 km (calculated)495 km (estimated) 0.07 (estimated)0.10 (assumed)0.369 Spectrally prominent organics, organics-type ("Cliff type TNO")RRC (assumed) 42.6 K (perihelion)10 4.667 0.091 (R)4.85.15.290 0.060lcdb-Lellouch-2013 (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 was discovered on 9 November 2002. Discovery 1995 TL 8 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. It was the first of the bodies presently classified as a scattered-disc object (SDO)March 2021 to be discovered, preceding the SDO prototype (15874) 1996 TL 66 by almost a year.1996 TO66 -- ANOTHER LARGE TRANSNEPTUNIAN OBJECT http://www.cbat.eps.harvard.edu/pressinfo/1996TO66.html 2024-10-17 www.cbat.eps.harvard.edu Satellite thumb|left|Animation of two Hubble images of 1995 TL 8's satellite in August 2001 thumb|left|Comparison of mean separation distances and diameters of trans-Neptunian close binaries, including 1995 TL 8 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 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 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 161 km mi. left thumb|900px|none|A relative size and distance comparison of the 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 1995 TL 8 primary. left Scattered–extended object 1995 TL 8 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. However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity. Simulations made in 2007 show that 1995 TL 8 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. horizontal left 190 280 1995 TL8 AnimLong.gif 1995TL8 Orbital Period.jpg Left: The near 3:7 resonance pattern of 1995 TL 8 with Neptune only moves clockwise. It never halts and reverses course (i.e. librates).Right: The orbital period of 1995 TL 8 missing the 7:3 (2.333) resonance of Neptune left Numbering and naming This minor planet was numbered by the Minor Planet Center on 20 November 2002. As of 2025, it has not been named. See also 3753 Cruithne (orbital circulations due to near resonant perturbations with Earth) Resonant trans-Neptunian object – to see examples of objects with a proper 3:7 resonance with Neptune Notes lcdb-Lellouch-2013 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 30em 2021-01-16 last obs. JPL Small-Body Database Browser: 48639 (1995 TL8) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2048639 Jet Propulsion Laboratory 14 March 2021 48639 (1995 TL8) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=48639 16 November 2017 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Asteroids with Satellites Database – (48639) 1995 TL8 Johnston's Archive 21 September 2014 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/astmoons/am-48639.html 16 November 2017 List of Known Trans-Neptunian Objects Johnston's Archive 15 October 2017 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/tnoslist.html 16 November 2017 How many dwarf planets are there in the outer solar system? California Institute of Technology Michael E. Brown http://web.gps.caltech.edu/~mbrown/dps.html 16 November 2017 Marc W. Buie Marc W. Buie 2003-10-22 Orbit Fit and Astrometric record for 48639 SwRI (Space Science Department) http://www.boulder.swri.edu/~buie/kbo/astrom/48639.html 2009-01-26 V. V. Emelʹyanenko E. L. Kiseleva April 2008 Resonant motion of trans-Neptunian objects in high-eccentricity orbits http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008AstL...34..271E Astronomy Letters 34 4 271–279 2008AstL...34..271E 10.1134/S1063773708040075 122634598 16 November 2017 48639 16 November 2017 N. Peixinho A. Delsanti A. Guilbert-Lepoutre R. Gafeira P. Lacerda October 2012 The bimodal colors of Centaurs and small Kuiper belt objects http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A..86P Astronomy and Astrophysics 546 12 2012A&A...546A..86P 10.1051/0004-6361/201219057 1206.3153 55876118 16 November 2017 Irina N. Belskaya Maria A. Barucci Marcello Fulchignoni Anatolij N. Dovgopol April 2015 Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..250..482B Icarus 250 482–491 2015Icar..250..482B 10.1016/j.icarus.2014.12.004 16 November 2016 etal Noemí Pinilla-Alonso Rosario Brunetto Mário N. De Prá Bryan J. Holler Elsa Hénault Ana Carolina de Souza Feliciano A JWST/DiSCo-TNOs portrait of the primordial Solar System through its trans-Neptunian objects https://hal.science/hal-04961629v1/file/s41550-024-02433-2.pdf Nature Astronomy December 2024 9 2 230–244 10.1038/s41550-024-02433-2 2025NatAs...9..230P 274932942 etal R. Brunetto E. Hénault S. Cryan N. Pinilla-Alonso J. P. Emery A. Guilbert-Lepoutre Spectral Diversity of DiSCo's TNOs Revealed by JWST: Early Sculpting and Late Irradiation The Astrophysical Journal Letters March 2025 982 1 L8 free 10.3847/2041-8213/adb977 2025ApJ...982L...8B 259287422 External links 1999 MPEC listing 2000 MPEC listing Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Discovery Circumstances: Numbered Minor Planets (45001)-(50000) – Minor Planet Center 48639 48639 (48639) 1995 TL 8 048639 Category:Discoveries by Arianna E. Gleason 048639 19951015 20021109