8026 Johnmckay
| Discovery [1] | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 8 May 1991 |
| Designations | |
| 8026 Johnmckay | |
Named after | John B. McKay (test pilot)[2] |
| 1991 JA1 · 1989 UF2 | |
| main-belt (inner) · Hungaria [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.81 yr (9,427 days) |
| Aphelion | 2.0698 AU |
| Perihelion | 1.7802 AU |
| 1.9250 AU | |
| Eccentricity | 0.0752 |
| 2.67 yr (976 days) | |
| 246.14° | |
| Inclination | 19.934° |
| 217.71° | |
| 145.76° | |
| Known satellites | 1 [4] |
| Physical characteristics | |
| Dimensions | 1.690±0.239 km[5] 2.54 km (calculated)[3] |
| 2.2981±0.0005 h[6] 355±5 h[7] | |
| 0.8148±0.1957[5] 0.30 (assumed)[3] | |
| E [3] | |
| 14.9[1] | |
8026 Johnmckay, provisional designation 1991 JA1, is a bright, binary[4] asteroid from the inner regions of the asteroid belt, about 2 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin at the U.S. Palomar Observatory, California, on 8 May 1991.[2]
The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.8–2.1 AU once every 2 years and 8 months (976 days). Its orbit is tilted by 20 degrees to the plane of the ecliptic and shows an eccentricity of 0.08. In 2010, a photometric light-curve analysis at the U.S. Palmer Divide Station in Colorado has rendered rotation period of 2.2981±0.0005 hours with a brightness amplitude of 0.10 in magnitude.[6]
According to the survey carried out by the NEOWISE mission of the U.S. Wide-field Infrared Survey Explorer, the body's surface has an exceptionally high albedo of 0.81, while the Collaborative Asteroid Lightcurve Link (CALL) assumes a more realistic value of 0.30, which is typical for bright E-type asteroids.[3][5]
The asteroid was discovered in 2010 to have a small asteroid moon around it, orbiting it every 2.300±0.001 hours.[4]
The minor planet was named in memory of NASA research pilot John B. McKay (1922–1975), who was the fifth pilot to fly the North American X-15 and made a total of 29 flights. Before joining the X-15 program, he made 46 flights in the X-1 and D-558-II Skyrocket. In 2005, he received posthumous NASA astronaut wings for a flight that reached an altitude of 89,900 metres (294,900 feet).[2]
References
- ^ a b c "JPL Small-Body Database Browser: 8026 Johnmckay (1991 JA1)" (2015-08-19 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c "8026 Johnmckay (1991 JA1)". Minor Planet Center. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c d e "LCDB Data for (8026) Johnmckay". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c Johnston, Robert. "(8026) Johnmckay". johnstonsarchive.net. Retrieved 29 May 2015.
- ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved January 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b Warner, Brian D. (January 2011). "A Quartet of Known and Suspected Hungaria Binary Asteroids". Bulletin of the Minor Planets. 38 (1). Section of the Association of Lunar and Planetary Observers: 33–36. Bibcode:2011MPBu...38...33W. ISSN 1052-8091. Retrieved January 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ Warner, Brian D. (October 2015). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 March-June". Bulletin of the Minor Planets. 42 (4). Section of the Association of Lunar and Planetary Observers: 267–276. Bibcode:2015MPBu...42..267W. ISSN 1052-8091. Retrieved January 2016.
{{cite journal}}: Check date values in:|access-date=(help)
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 8026 Johnmckay at the JPL Small-Body Database
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