Astronomy:1704 Wachmann
.png) Light curve based 3D-model of Wachmann | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 March 1924 |
| Designations | |
| (1704) Wachmann | |
| Named after | Arno Wachmann (German astronomer)[2] |
| A924 EE · 1947 CE 1957 BJ | |
| Minor planet category | main-belt · (inner)[3] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.16 yr (34,026 days) |
| |{{{apsis}}}|helion}} | 2.4163 AU |
| |{{{apsis}}}|helion}} | 2.0292 AU |
| 2.2228 AU | |
| Eccentricity | 0.0871 |
| Orbital period | 3.31 yr (1,210 days) |
| Mean anomaly | 67.047° |
| Mean motion | 0° 17m 50.64s / day |
| Inclination | 0.9715° |
| Longitude of ascending node | 259.47° |
| 280.77° | |
| Physical characteristics | |
| Dimensions | 6.618±0.070[4] 6.934±0.070 km[5] 7.82 km (calculated)[3] |
| Rotation period | 3.314±0.001 h[6] |
| Geometric albedo | 0.1767±0.0133[5] 0.193±0.036[4] 0.20 (assumed)[3] |
| S[3] | |
| Absolute magnitude (H) | 12.9[1][3] · 12.97±0.13[7] · 13.3[5] |
1704 Wachmann, provisional designation A924 EE, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 March 1924. It was later named after astronomer Arno Wachmann.[2][8]
Classification and orbit
The S-type asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.09 and an inclination of 1° with respect to the ecliptic.[1] No precoveries were taken. The asteroid's observation arc begins 3 days after its official discovery observation.[8]
Physical characteristics
Lightcurves
In April 2007, a rotational lightcurve Wachmann was obtained at the U.S. Sandia View Observatory in New Mexico (H03). Lightcurve analysis gave a well-defined rotation period of 3.314±0.001 hours with a brightness variation of 0.40 magnitude ({{{1}}}).[6]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Wachmann measures 6.6 and 6.9 kilometers in diameter, and its surface has an albedo of 0.177 and 0.193, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.8 kilometers, based on an absolute magnitude of 12.9.[3]
Naming
This minor planet was named for Arno Wachmann (1902–1990), long-time astronomer at the Bergedorf Observatory in Hamburg, discoverer of minor planets and comets, and observer of variable and binary stars. He is best known for the co-discovery of the three "Schwassmann–Wachmann" comets, 29P, 31P and 73P.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933).[9]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1704 Wachmann (A924 EE)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001704. Retrieved 7 June 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1704) Wachmann". Dictionary of Minor Planet Names – (1704) Wachmann. Springer Berlin Heidelberg. pp. 135–136. doi:10.1007/978-3-540-29925-7_1705. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (1704) Wachmann". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1704%7CWachmann. Retrieved 20 July 2016.
- ↑ 4.0 4.1 4.2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 8 December 2016.
- ↑ 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 6.0 6.1 Julian, II, William M. (March 2008). "Period Determination for 1704 Wachmann". The Minor Planet Bulletin 35 (1): 4. ISSN 1052-8091. Bibcode: 2008MPBu...35....4J. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35....4J. Retrieved 20 July 2016.
- ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 20 July 2016.
- ↑ 8.0 8.1 "1704 Wachmann (A924 EE)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1704. Retrieved 20 July 2016.
- ↑ Schmadel, Lutz D.. "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
- 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
- 1704 Wachmann at AstDyS-2, Asteroids—Dynamic Site
- 1704 Wachmann at the JPL Small-Body Database
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