(34746) 2001 QE91
Discovery [1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 22 August 2001 |
Designations | |
MPC designation | (34746) 2001 QE91 |
2001 QE91 · 1949 KS 1990 VD1 · 1991 XC5 | |
Jupiter trojan [1][2] Trojan [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 68.99 yr (25,198 d) |
Aphelion | 5.3597 AU |
Perihelion | 4.9698 AU |
5.1647 AU | |
Eccentricity | 0.0377 |
11.74 yr (4,287 d) | |
222.82° | |
0° 5m 2.4s / day | |
Inclination | 27.423° |
93.246° | |
195.32° | |
Jupiter MOID | 0.2023 AU |
TJupiter | 2.7750 |
Physical characteristics | |
Mean diameter |
±0.917 km 61.684[5] ±4.11 km 63.63[6] |
±0.002 h 19.633[7] | |
±0.004 0.061[5] ±0.012 0.091[6] | |
C (assumed)[8] B–V = ±0.060 0.680[9] V–R = ±0.040 0.450[9] V–I = ±0.031 0.950[8] | |
9.20[6] 9.7[5] 9.8[1][2] | |
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(34746) 2001 QE91, provisional designation 2001 QE91, is a dark Jupiter trojan from the Trojan camp, approximately 60 kilometers (37 miles) in diameter. It was discovered on 22 August 2001, by astronomers with the Lincoln Near-Earth Asteroid Research at Lincoln Lab's ETS in Socorro, New Mexico.[1] The possibly elongated Jovian asteroid is one of the 70 largest Jupiter trojans and has a rotation period of 19.6 hours.[8] It has not been named since its numbering in January 2002.[10]
Orbit and classification
2001 QE91 is a dark Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit .[3] It is also a non-family asteroid of the Jovian background population.[4]
It orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 9 months (4,287 days; semi-major axis of 5.16 AU). Its orbit has an eccentricity of 0.04 and an inclination of 27° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1949 KS at the Goethe Link Observatory in November 1945, almost 56 years prior to its official discovery observation at Socorro.[1]
Physical characteristics
2001 QE91 is an assumed C-type asteroid. Its V–I color index of 0.95 is typical for most D-type asteroids, the dominant spectral type among the Jupiter trojans.[8]
Rotation period
In April 2007, a rotational lightcurve of 2001 QE91 was obtained from photometric observations by Lawrence Molnar at Calvin University, using the Calvin-Rehoboth Robotic Observatory in New Mexico. Lightcurve analysis gave a well-defined rotation period of ±0.002 hours with a high brightness variation of 0.56 19.633magnitude (U=3).[8][7] A high amplitude is indicative of a non-spherical shape.
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2001 QE91 measures between 61.68 and 63.63 kilometers in diameter and its surface has an albedo between 0.061 and 0.091.[5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.0580 and calculates a diameter of 60.51 kilometers based on an absolute magnitude of 9.8.[8]
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Numbering and naming
This minor planet was numbered on 28 January 2002 (M.P.C. 22480).[10] As of 2018, it has not been named.[1]
References
- 1 2 3 4 5 6 "34746 (2001 QE91)". Minor Planet Center. Retrieved 18 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 34746 (2001 QE91)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 18 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 18 June 2018.
- 1 2 "Asteroid (34746) 2001 QE91 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 18 June 2018.
- 1 2 3 4 Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 18 June 2018. (online catalog)
- 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 18 June 2018. (online, AcuA catalog p. 153)
- 1 2 Molnar, Lawrence A.; Haegert, Melissa, J.; Hoogeboom, Kathleen M. (June 2008). "Lightcurve Analysis of an Unbiased Sample of Trojan Asteroids". The Minor Planet Bulletin. 35 (2): 82–84. Bibcode:2008MPBu...35...82M. ISSN 1052-8091. Retrieved 18 June 2018.
- 1 2 3 4 5 6 "LCDB Data for (34746)". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2018.
- 1 2 Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026. Retrieved 13 June 2016.
- 1 2 "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (30001)-(35000) – Minor Planet Center
- Asteroid (34746) 2001 QE91 at the Small Bodies Data Ferret
- (34746) 2001 QE91 at AstDyS-2, Asteroids—Dynamic Site
- (34746) 2001 QE91 at the JPL Small-Body Database