(48639) 1995 TL8: Difference between revisions

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|url=http://www.boulder.swri.edu/~buie/kbo/astrom/48639.html
|url=http://www.boulder.swri.edu/~buie/kbo/astrom/48639.html
|accessdate=2009-01-26}}</ref>
|accessdate=2009-01-26}}</ref>
| orbit_ref = <ref name=jpldata>{{cite web
| epoch=[[March 6]], [[2006]] ([[Julian day|JD]] 2453800.5)
|date=2008-08-29 last obs
⚫
| semimajor=7,814.8 [[Giga|G]]m (52.239 [[Astronomical unit|AU]])
|title=JPL Small-Body Database Browser: 48639 (1995 TL8)
⚫
| perihelion=5,986.3 Gm (40.016 AU)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48639
⚫
| aphelion=9,643.4 Gm (64.462 AU)
|accessdate=2009-01-26}}</ref>
| eccentricity=0.234
| period=137,907 [[day|d]] (377.57 [[Julian year (astronomy)|a]])
| epoch=Novemer 30, 2008 ([[Julian day|JD]] 2454800.5)
⚫
| semimajor=7,858 [[Giga|G]]m<br>52.533 [[Astronomical unit|AU]] (a)
⚫
| inclination=0.2[[degree (angle)|°]]
⚫
| perihelion=5,980 Gm<br>39.980 AU (q)
⚫
| asc_node=260.7°
⚫
| aphelion=9,736 Gm<br>65.086 AU (Q)
⚫
| arg_peri=83.4°
| mean_anomaly=33.6°
| eccentricity=0.23894
| period=139077 [[day|d]] (380.77 [[Julian year (astronomy)|a]])
⚫
| inclination=0.24686[[degree (angle)|°]]
⚫
| asc_node=260.30°
⚫
| arg_peri=84.104°
| mean_anomaly=35.705°
| avg_speed=4.06 km/[[second|s]]
| avg_speed=4.06 km/[[second|s]]
| satellites=1
| satellites=1
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|url=http://adsabs.harvard.edu/abs/2008AstL...34..271E
|url=http://adsabs.harvard.edu/abs/2008AstL...34..271E
|accessdate=2009-01-26 }}</ref>
|accessdate=2009-01-26 }}</ref>

It has been observed 48 times and has an orbit quality code of 4 (0 being best; 8 being worst).<ref name=jpldata/>


==See also==
==See also==

Revision as of 22:38, 26 January 2009

Template:Downsize

(48639) 1995 TL8
Discovery
Discovered byA. Gleason (Spacewatch)
Discovery dateOctober 15, 1995 and
November 9, 2002 (moon)
Designations
Designation
(48639) 1995 TL8
none
Ext-SDO (DES)[1]
Orbital characteristics[2]
Epoch Novemer 30, 2008 (JD 2454800.5)
Aphelion9,736 Gm
65.086 AU (Q)
Perihelion5,980 Gm
39.980 AU (q)
7,858 Gm
52.533 AU (a)
Eccentricity0.23894
139077 d (380.77 a)
4.06 km/s
35.705°
Inclination0.24686°
260.30°
84.104°
Known satellites1
Physical characteristics
Dimensions~350 and ~160 km (binary)
Mass~4.5 and ~0.4 ×1019 kg
Mean density
2.0? g/cm³
~0.10 and ~0.04 m/s²
~0.18 and ~0.08 km/s
? d
Albedo0.10?
Temperature~38 K
Spectral type
?
5.28 and 6.98

(48639) 1995 TL8 (also written (48639) 1995 TL8) is a trans-Neptunian object of the detached (Extended–Scattered Disc) subclass, and possesses a relatively large satellite.

The assumed diameter of 352 km is derived from an albedo guess of 0.09, being typical for trans-Neptunian objects.[3]

Discovery

Discovered in 1995 by Arianna E. Gleason as part of the Spacewatch project, it was the first of the bodies presently classified as a Scattered disk object (SDO) to be discovered, preceding the SDO prototype (15874) 1996 TL66 by almost a year.

Satellite

A relative size and distance comparison of the (48639) 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 (48639) 1995 TL8 primary.

A companion was discovered by Denise C. Stephens and Keith S. Noll from observations with the Hubble Space Telescope taken on November 9, 2002 and announced on October 5, 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 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.[4]

Scattered-Extended object

(48639) 1995 TL8 is classified as scattered-extended by the Deep Ecliptic Survey (DES) since it's orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.[1] Though if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.

Simulations by Emel’yanenko and Kiseleva in 2007 show that (48639) 1995 TL8 appears to have less than a 1% chance of being in a 3:7 resonance with Neptune, but it did execute circulations near this resonance.[5]

It has been observed 48 times and has an orbit quality code of 4 (0 being best; 8 being worst).[2]

See also

  • 3753 Cruithne (orbital circulations due to near resonant perturbations with Earth)

References

  1. ^ a b Marc W. Buie (2003-10-22). "Orbit Fit and Astrometric record for 48639". SwRI (Space Science Department). Retrieved 2009-01-26.
  2. ^ a b "JPL Small-Body Database Browser: 48639 (1995 TL8)". 2008-08-29 last obs. Retrieved 2009-01-26. {{cite web}}: Check date values in: |date= (help)
  3. ^ Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2009-01-26.
  4. ^ Wm. Robert Johnston (2005-10-09). "(48639) 1995 TL8". Johnston's Archive. Retrieved 2006-02-07.
  5. ^ Emel’yanenko, V. V (2008). "Resonant motion of trans-Neptunian objects in high-eccentricity orbits". Astronomy Letters. 34: 271–279. doi:10.1007/s11443-008-4007-9. Retrieved 2009-01-26. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

External links


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