_Hopmann.png) Shape of Hopmann modeled from its
lightcurve | |
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 13 January 1929 |
| Designations | |
| (1985) Hopmann | |
Named after |
Josef Hopmann (German astronomer) [2] |
| 1929 AE · 1951 CA2 1951 CP · 1952 KE 1964 PJ · 1973 AA4 | |
| main-belt · ( outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 ( JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.16 yr (32,201 days) |
| Aphelion | 3.6021 AU |
| Perihelion | 2.6408 AU |
| 3.1214 AU | |
| Eccentricity | 0.1540 |
| 5.51 yr (2,014 days) | |
| 334.27 ° | |
| 0° 10m 43.32s / day | |
| Inclination | 17.159° |
| 305.15° | |
| 234.25° | |
| Physical characteristics | |
| 35.47 km (derived)
[3] 35.51±3.1 km ( IRAS:6) [1] 44.33±3.53 km [4] | |
| 17.476±0.003
h
[5] 17.478±0.004 h [6] 17.4787±0.0001 h [7] 17.480±0.002 h [8] | |
| 0.039±0.007 (IRAS:6)
[4] 0.0613 (derived) [3] | |
| C [3] | |
| 10.75±0.19 [9] · 10.9 [1] [3] · 10.91 [4] | |
1985 Hopmann ( prov. designation: 1929 AE) is a dark background asteroid in the outer regions of the asteroid belt. It was discovered on 13 January 1929, by astronomer Karl Reinmuth at Landessternwarte Heidelberg-Königstuhl in southern Germany. [10] The asteroid has a rotation period of 17.5 hours and measures approximately 36 kilometers (22 miles) in diameter. It was later named after German astronomer Josef Hopmann (1890–1975). [2]
Orbit and classification
Hopmann is a dark C-type asteroid that orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (2,014 days). Its orbit has an eccentricity of 0.15 and an inclination of 17 ° with respect to the ecliptic. [1] The first observation used for the body's observation arc was taken at the discovering observatory on 4 February 1926, or 22 days after its official discovering observation. [10]
Naming
This minor planet was named in memory of German astronomer Josef Hopmann (1890–1975), a director of Vienna Observatory between 1951 and 1962, a productive observer of variable and binary stars, and a participant in the international program to observe near-Earth asteroid 433 Eros in the early 1930s. The lunar crater Hopmann is also named in his honour. [2] The official naming citation was published by the Minor Planet Center on 15 October 1977 ( M.P.C. 4237). [11]
Physical characteristics
According to the survey carried out by the Infrared Astronomical Satellite IRAS, Hopmann measures 35.51 kilometers in diameter. [1] The Collaborative Asteroid Lightcurve Link agrees with the Supplemental IRAS Minor Planet Survey (SIMPS) data and derives an albedo of 0.039 and a diameter of 35.47 kilometers, [3] while observations with NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission gave an albedo of 0.06 and a diameter of 44.33 kilometers. [4]
In January and February 2012, three rotational lightcurves were obtained by Robert Stephens at Santana Observatory ( 646), California, Josep Maria Aymami at Carmelita Observatory ( B20), Barcelona, and Patricia Moravec at Oakley Southern Sky Observatory ( E09), Australia. The lightcurves gave a well-defined rotation period of 17.476, 17.478 and 17.480 hours, respectively, with a brightness variation between 0.36 and 0.44 magnitude ( U=3/3/3-). [5] [6] [8] In 2016, a re-modeled lightcurve, constructed from data compiled in the Lowell Photometric Database, also gave a concurring period. [7]
References
- ^ a b c d e f "JPL Small-Body Database Browser: 1985 Hopmann (1929 AE)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
- ^ a b c Schmadel, Lutz D. (2007). "(1985) Hopmann". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 160. doi: 10.1007/978-3-540-29925-7_1986. ISBN 978-3-540-00238-3.
- ^ a b c d e f "LCDB Data for (1985) Hopmann". Asteroid Lightcurve Database (LCDB). Retrieved 25 October 2016.
- ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (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 25 October 2016.
- ^ a b 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" (PDF). Minor Planet Bulletin. 39 (3): 179–181. Bibcode: 2012MPBu...39..179A. ISSN 1052-8091. Archived from the original (PDF) on 23 March 2020. Retrieved 17 March 2020.
- ^ a b Moravec, Patricia; Cochren, Joseph; Gerhardt, Michael; Harris, Andrew; Karnemaat, Ryan; Melton, Elizabeth; et al. (October 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 January-April" (PDF). Minor Planet Bulletin. 39 (4): 213–216. Bibcode: 2012MPBu...39..213M. ISSN 1052-8091. Retrieved 17 March 2020.
- ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv: 1601.02909. Bibcode: 2016A&A...587A..48D. doi: 10.1051/0004-6361/201527573. Retrieved 25 October 2016.
- ^ a b Stephens, Robert D. (July 2012). "Asteroids Observed from GMARS and Santana Observatories: 2012 January - March" (PDF). Minor Planet Bulletin. 39 (3): 181–183. Bibcode: 2012MPBu...39..181S. ISSN 1052-8091. Archived from the original (PDF) on 23 March 2020. Retrieved 17 March 2020.
- ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv: 1506.00762. Bibcode: 2015Icar..261...34V. doi: 10.1016/j.icarus.2015.08.007. Retrieved 25 October 2016.
- ^ a b "1985 Hopmann (1929 AE)". Minor Planet Center. Retrieved 25 October 2016.
- ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi: 10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
External links
- Prof. Dr. phil. habil. Josef Hopmann, catalogus professorum (Leipzig University)
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1985 Hopmann at AstDyS-2, Asteroids—Dynamic Site
- 1985 Hopmann at the JPL Small-Body Database
