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(48639) 1995 TL8

Trans-Neptunian binary

Field	Value
minorplanet	yes
name
background	#C2E0FF
image	1995TL8-satellite-discovery.jpg
caption	and its satellite (unresolved) imaged by the Hubble Space Telescope
discovery_ref
discoverer	A. Gleason (Spacewatch)
discovery_site	Kitt Peak National Obs.
discovered	15 October 1995
mpc_name
alt_names
named_after
mp_category	TNOOther TNO
detacheddistant
orbit_ref
epoch	17 December 2020 (JD 2459200.5)
uncertainty	2
observation_arc	25.26 yr (9,225 days)
aphelion	65.218 AU
perihelion	39.937 AU
semimajor	52.578 AU
eccentricity	0.2404
period	381.25 yr (139,251 days)
mean_anomaly	46.972°
mean_motion	/ day
inclination	0.2499°
asc_node	260.007°
arg_peri	84.397°
satellites	1 (D: 80 km)
dimensions	176 km
420.27 km (calculated)
495 km (estimated)
albedo	0.07 (estimated)
0.10 (assumed)
0.369
spectral_type	RRC (assumed)
abs_magnitude	(R)4.85.1

detacheddistant 420.27 km (calculated) 495 km (estimated) 0.10 (assumed) 0.369

**** 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

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) to be discovered, preceding the SDO prototype by almost a year.

Satellite

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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 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.

Scattered–extended object

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 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.

Right: The orbital period of 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. As of 2025, it has not been named.

Notes

References

"1996 TO66 -- ANOTHER LARGE TRANSNEPTUNIAN OBJECT".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

scattered-disc-and-detached-objects discoveries-by-arianna-e.-gleason binary-trans-neptunian-objects astronomical-objects-discovered-in-1995 astronomical-objects-discovered-in-2002

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