49 Pales
Discovery[1] | |
---|---|
Discovered by | Hermann Goldschmidt |
Discovery site | Paris Observatory |
Discovery date | September 19, 1857 |
Designations | |
MPC designation | 49 |
Named after | Pales |
Main belt [2] | |
Orbital characteristics[3] | |
Epoch November 30, 2008 | |
Aphelion | 3.8065 AU |
Perihelion | 2.3813 AU |
3.09392 AU | |
Eccentricity | 0.230323 |
1987.75 days (5.44 years) | |
274.69° | |
Inclination | 3.18° |
286.135° | |
109.804° | |
Physical characteristics | |
Dimensions |
149.80 ± 3.8 km Mean diameter[4] |
Mass | 2.69×1018 kg[5] |
10.42 ± 0.02[6] hours | |
Albedo | 0.0597 ± 0.003[4] |
Spectral type | C[7] |
7.8[8] | |
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49 Pales /ˈpeɪliːz/ is a large, dark main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on September 19, 1857 from his balcony in Paris.[1] The asteroid is named after Pales, the goddess of shepherds in Roman mythology. Since it was discovered on the same night as 48 Doris, geologist Élie de Beaumont suggested naming the two "The Twins".[9]
Pales has been studied by radar.[10] Photometric observations of this asteroid from the Torino Observatory during 1977 gave a light curve with a period of 10.42 ± 0.02 hours and a brightness variation of 0.18 in magnitude. The curve appeared to show a secondary minima.[6] The shape of the curve has a similar appearance to the light curve of binary star Algol, suggesting that this may be a binary asteroid system.[11]
References
- 1 2 "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 2 February 2009. Retrieved December 29, 2008.
- ↑ "49 Pales". JPL Small-Body Database. Jet Propulsion Laboratory. Retrieved December 29, 2008.
- ↑ "(49) Pales". AstDyS. Italy: University of Pisa. Retrieved December 29, 2008.
- 1 2 Tedesco; et al. (2004). "Supplemental IRAS Minor Planet Survey (SIMPS)". IRAS-A-FPA-3-RDR-IMPS-V6.0. Planetary Data System. Retrieved December 29, 2008.
- ↑ Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 29 January 2009. Retrieved 2008-12-29.
- 1 2 Schober, H. J.; et al. (April 1979), "Photoelectric photometry and rotation periods of three large and dark asteroids - 49 Pales, 88 Thisbe and 92 Undina", Astronomy and Astrophysics, Supplement Series 36, pp. 1–8, Bibcode:1979A&AS...36....1S.
- ↑ Neese (2005). "Asteroid Taxonomy". EAR-A-5-DDR-TAXONOMY-V5.0. Planetary Data System. Retrieved December 27, 2008.
- ↑ Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Archived from the original on 1 December 2008. Retrieved December 29, 2008.
- ↑ Schmadel, Lutz (2003), Dictionary of minor planet names (fifth ed.), Germany: Springer, p. 19, ISBN 3-540-00238-3.
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30.
- ↑ Tedesco, E. F. (March 1979), "Binary asteroids - Evidence for their existence from lightcurves", Science 203 (4383), pp. 905–907, Bibcode:1979Sci...203..905T, doi:10.1126/science.203.4383.905, PMID 17771729.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- 49 Pales at the JPL Small-Body Database
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