1995 Hajek
| Discovery [1][2] | |
|---|---|
| Discovered by | L. Kohoutek |
| Discovery site | Bergedorf Obs. |
| Discovery date | 26 October 1971 |
| Designations | |
| 1995 Hajek | |
Named after | Tadeáš Hájek (astronomer)[3] |
| 1971 UP1 · 1941 EA | |
| main-belt · (inner) [4] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 74.92 yr (27363 days) |
| Aphelion | 2.6659 AU (398.81 Gm) |
| Perihelion | 2.3918 AU (357.81 Gm) |
| 2.5289 AU (378.32 Gm) | |
| Eccentricity | 0.054187 |
| 4.02 yr (1468.9 d) | |
| 219.12° | |
| 0° 14m 42.288s / day | |
| Inclination | 10.824° |
| 47.236° | |
| 134.61° | |
| Earth MOID | 1.40188 AU (209.718 Gm) |
| Jupiter MOID | 2.31046 AU (345.640 Gm) |
| TJupiter | 3.425 |
| Physical characteristics | |
| Dimensions | 15.29±1.04 km[5] 12.683±0.288 km[6] 14.45±2.58 km[7] 6.50 km (calculated)[4] 10±4 km (magnitude)[8] |
| 10 h (0.42 d)[1][9] | |
| 0.063±0.010[5] 0.0833±0.0249[6] 0.040±0.025[7] 0.20 (assumed)[4] | |
| X [4][10] | |
| 13.3[1] | |
1995 Hajek, provisional designation 1971 UP1, is a metallic asteroid from the inner regions of the asteroid belt. It was discovered by Czech astronomer Luboš Kohoutek at the Bergedorf Observatory in Hamburg, Germany, on 26 October 1971.[2]
The asteroid orbits the Sun at a distance of 2.4–2.7 AU once every 4.02 years (1,469 days). Its orbit shows an eccentricity of 0.05 and is tilted by 11 degrees to the plane of the ecliptic. It has a provisional rotation period of 10 hours[9] and measurements of its spectral properties identified it as a metallic X-type asteroid.[4][10]
Observations by the Akari and WISE satellites, as well as calculations by the Collaborative Asteroid Lightcurve Link (CALL), rendered a divergent estimated of the body's diameter in a large range of 6.5 to 15.3 kilometers. Likewise, the body's albedo also varies between 0.04 and 0.08 for the satellite-based observations, while CALL assumes an albedo of 0.20.[4] These contrasting albedo and diameter figures closely correspond to a generic magnitude-to-diameter conversion, where, for an absolute magnitude of 13.3, the body's diameter is in the range of about 6 to 14 kilometers, based on an albedo between 0.05 and 0.25.[8]
The minor planet is named after the Bohemian astronomer Tadeáš Hájek (1525–1600), better known by his Latinized name, Thaddaeus Hagecius. He was one of the founders of modern stellar and cometary astronomy, who studied the Great Comet of 1577 and the supernova SN 1572, also known as Tycho's Nova. The lunar crater Hagecius is also named in his honour.[3]
References
- ^ a b c d "JPL Small-Body Database Browser: 1995 Hajek (1971 UP1)" (2015-11-21 last obs.). Jet Propulsion Laboratory. Retrieved 17 April 2016.
- ^ a b "1995 Hajek (1971 UP1)". Minor Planet Center. Retrieved October 2015.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1995) Hajek. Springer Berlin Heidelberg. p. 161. ISBN 978-3-540-29925-7. Retrieved October 2015.
{{cite book}}: Check date values in:|accessdate=(help) - ^ a b c d e f "LCDB Data for (1995) Hajek". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b 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 December 2015.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved December 2015.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; Cabrera, M. S. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved December 2015.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b "Absolute Magnitude (H)". NASA/JPL. Retrieved 2014-06-24.
- ^ a b Behrend, R. (December 2003). "Asteroids and comets rotation curves—(1995) Hajek". Geneva Observatory. Retrieved October 2015.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b Xu, Shui; Binzel, Richard P.; Burbine, Thomas H.; Bus, Schelte J. (May 1995). "Small main-belt asteroid spectroscopic survey: Initial results". Icarus: 1–35. Bibcode:1995Icar..115....1X. doi:10.1006/icar.1995.1075. ISSN 0019-1035. Retrieved December 2015.
{{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 (1)-(5000) – Minor Planet Center
- 1995 Hajek at the JPL Small-Body Database
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