1985 Hopmann

1985 Hopmann
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 13 January 1929
Designations
MPC designation 1985 Hopmann
Named after
 Josef Hopmann[2]
1929 AE · 1951 CA2
1951 CP · 1952 KE
1964 PJ · 1973 AA4
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 87.00 yr (31775 days)
Aphelion 3.6029 AU (538.99 Gm)
Perihelion 2.6424 AU (395.30 Gm)
3.1226 AU (467.13 Gm)
Eccentricity 0.15380
5.52 yr (2015.5 d)
227.21°
0° 10m 43.032s / day
Inclination 17.157°
305.17°
234.08°
Earth MOID 1.68825 AU (252.559 Gm)
Jupiter MOID 1.61702 AU (241.903 Gm)
Jupiter Tisserand parameter 3.129
Physical characteristics
Dimensions 35.51±3.1 km (IRAS:6)[1]
44.33±3.53 km[4]
Mean radius
 17.755 ± 1.55 km
17.480±0.002 h[5]
17.476±0.003 h[6]
17.478±0.004 h[7]
17.480 h (0.7283 d)r1[1]
0.0671 ± 0.014 (IRAS:6)[1]
0.039±0.007[4]
C [3]
10.9(IRAS:6)[1]

    1985 Hopmann, provisional designation 1929 AE, is a carbonaceous asteroid in the outer regions of the asteroid belt, about 36 kilometers in diameter. It was discovered on 13 January 1929, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[8]

    The dark C-type asteroid orbits the Sun at a distance of 2.6–3.6 AU every five and a half years (2,016 days). It has a low geometric albedo of 0.04 and 0.07, according to the IRAS and WISE/NEOWISE surveys, respectively.[1][4]

    Photometric measurements made from the Oakley Southern Sky Observatory during 2012 gave a light curve with a period of 17.478±0.004 hours[7] and a variation in brightness of 0.34±0.04 in magnitude. Within the margin of error, this result is consistent with a synodic period estimate of 17.48 hours made in by two other, independent investigators.[5][6]

    The asteroid is named after astronomer Josef Hopmann (1890–1975), who was director of Vienna Observatory (1951–1962), an active observer of binary and variable stars, and a participant in the international program to observe 433 Eros during 1930/31.[2] The lunar crater Hopmann is also named in his honour.

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 1985 Hopmann (1929 AE)" (2015-11-21 last obs.). Jet Propulsion Laboratory. Retrieved 18 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1985) Hopmann. Springer Berlin Heidelberg. p. 160. ISBN 978-3-540-29925-7. Retrieved October 2015.
    3. 1 2 "LCDB Data for (1985) Hopmann". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
    4. 1 2 3 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.
    5. 1 2 Stephens, Robert D. (July 2012). "Asteroids Observed from GMARS and Santana Observatories: 2012 January - March". The Minor Planet Bulletin 39 (3): 181–183. Bibcode:2012MPBu...39..181S. ISSN 1052-8091. Retrieved December 2015.
    6. 1 2 Aymami, Josep Maria (July 2012). "CCD Photometry and Lightcurve Analysis of Main-Belt Asteroids 14 Irene 4874 Burke, 1985 Hopmann, 3017 Petrovic, and 3070 Aitken from Observatori Carmelita in Tiana". The Minor Planet Bulletin 39 (3): 179–181. Bibcode:2012MPBu...39..179A. ISSN 1052-8091. Retrieved December 2015.
    7. 1 2 Moravec, Patricia; Cochren, Joseph; Gerhardt, Michael; Harris, Andrew; Karnemaat, Ryan; Melton, Elizabeth; Stolze, Kellen; West, Josh; Ditteon, Richard (October 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 January-April". The Minor Planet Bulletin 39 (4): 213–216. Bibcode:2012MPBu...39..213M. ISSN 1052-8091. Retrieved December 2015.
    8. ↑ "1985 Hopmann (1929 AE)". Minor Planet Center. Retrieved October 2015.

    External links


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