1995 Hajek

1995 Hajek
Discovery [1][2]
Discovered by L. Kohoutek
Discovery site Bergedorf Obs.
Discovery date 26 October 1971
Designations
MPC designation 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)
Jupiter Tisserand parameter 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

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1995 Hajek (1971 UP1)" (2015-11-21 last obs.). Jet Propulsion Laboratory. Retrieved 17 April 2016.
    2. 1 2 "1995 Hajek (1971 UP1)". Minor Planet Center. Retrieved 24 October 2015.
    3. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1995) Hajek. Springer Berlin Heidelberg. p. 161. ISBN 978-3-540-29925-7. Retrieved 24 October 2015.
    4. 1 2 3 4 5 6 "LCDB Data for (1995) Hajek". Asteroid Lightcurve Database (LCDB). Retrieved 17 December 2015.
    5. 1 2 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 17 December 2015.
    6. 1 2 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 17 December 2015.
    7. 1 2 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 December 2015.
    8. 1 2 "Absolute Magnitude (H)". NASA/JPL. Retrieved 2014-06-24.
    9. 1 2 Behrend, R. (December 2003). "Asteroids and comets rotation curves—(1995) Hajek". Geneva Observatory. Retrieved 24 October 2015.
    10. 1 2 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 17 December 2015.

    External links


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