.png) Light curve based 3D-model of Wachmann | |
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 March 1924 |
| Designations | |
| MPC designation | (1704) Wachmann |
| Named after | Arno Wachmann (German astronomer) |
| Alternative designations | A924 EE · 1947 CE 1957 BJ |
| Minor planet category | main-belt · (inner) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.16 yr (34,026 days) |
| Aphelion | 2.4163 AU |
| Perihelion | 2.0292 AU |
| Semi-major axis | 2.2228 AU |
| Eccentricity | 0.0871 |
| Orbital period (sidereal) | 3.31 yr (1,210 days) |
| Mean anomaly | 67.047° |
| Mean motion | 0° 17 50.64 / day |
| Inclination | 0.9715° |
| Longitude of ascending node | 259.47° |
| Argument of perihelion | 280.77° |
| Physical characteristics | |
| Dimensions | 6.618±0.070 6.934±0.070 km 7.82 km (calculated) |
| Synodic rotation period | 3.314±0.001 h |
| Geometric albedo | 0.1767±0.0133 0.193±0.036 0.20 (assumed) |
| Spectral type | S |
| Absolute magnitude (H) | 12.9 · 12.97±0.13 · 13.3 |
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.
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. No precoveries were taken. The asteroid's observation arc begins 3 days after its official discovery observation.
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 (U=3).
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, 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.
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. The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933).
References
- ^ "JPL Small-Body Database Browser: 1704 Wachmann (A924 EE)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017.
- ^ 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.
- ^ "LCDB Data for (1704) Wachmann". Asteroid Lightcurve Database (LCDB). Retrieved 20 July 2016.
- ^ 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. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 8 December 2016.
- ^ 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.
- ^ Julian, II, William M. (March 2008). "Period Determination for 1704 Wachmann". The Minor Planet Bulletin. 35 (1): 4. Bibcode:2008MPBu...35....4J. ISSN 1052-8091. 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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 20 July 2016.
- ^ "1704 Wachmann (A924 EE)". Minor Planet Center. 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 Archived 16 December 2017 at the Wayback Machine)
- 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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