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Discovery
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| Discovered by | W. Baade |
| Discovery date | October 23, 1924 |
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Designations
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| Alternate name | 1924 TD; 1952 BF; 1954 HH |
| Minor planet category |
Amor  Mars-crosser asteroid |
| Epoch October 22, 2004 (JD 2453300.5) |
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| Aphelion | 611.961 Gm (4.091 AU) |
| Perihelion | 184.434 Gm (1.233 AU) |
| Semi-major axis | 398.198 Gm (2.662 AU) |
| Eccentricity | 0.537 |
| Orbital period | 1586.202 d (4.34 a) |
| Average orbital speed | 16.86 km/s |
| Mean anomaly | 152.459° |
| Inclination | 26.644° |
| Longitude of ascending node | 215.699° |
| Argument of perihelion | 132.429° |
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Physical characteristics
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| Dimensions | 31.7 km |
| Mass | 3.3 × 1016 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0089 m/s² |
| Escape velocity | 0.0168 km/s |
| Rotation period | 10.31 h [1] |
| Albedo | 0.17 [2] |
| Temperature | ~160 K |
| Spectral type | S (VI) [3][4] |
| Apparent magnitude | 8.1 [5] |
| Absolute magnitude (H) | 9.45 |
1036 Ganymed (pronounced /ˈɡænɨmɛd/) is the largest Amor asteroid, at about 32 km in diameter.[3] It was discovered by Walter Baade on October 23, 1924 and is named after Ganymede, the Trojan prince turned god whom Zeus designated the cupbearer to the Greek gods. Jupiter's moon Ganymede is also named after that individual. It is also a Mars-crosser asteroid.
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Physical characteristics
Owing to its early discovery date, Ganamed has a rich observational history. A 1931 paper published the absolute magnutude, based on observations to date, as 9.24[6] slightly brighter than the present value of 9.45. Ganymed is an S-type asteroid, meaning that it is relatively reflective and composed of iron- and magnesium-silicates. Spectral measurements put Ganymed in the S (VI) spectral subtype, indicating a surface rich in orthopyroxenes, and possibly metals (although if metals are present they are covered and not readily apparent in the spectra).[3]
In 1998, radar observations of Ganymed by the Arecibo radio telescope produced images of the asteroid, revealing a roughly spherical object.[7] Also around this time a study of several asteroid's visual lightcurve and polarization curves was conducted (the data for Ganymed is limited due to poor weather at the time), the study concluded that there was a weak correlation between the lightcurve and polarimetry curve as a function of rotation angle.[8] Because polarization is depenant on surface terrain and composition, rather than the observed size of the object like the lightcurve, this suggests that the surface features of the asteroid are roughly uniform over its observed surface.[8]
More recent observations of Ganymed's lightcurve, reported in 2007, confirm a rotation period of 10.314 ± 0.004 h and a lightcurve amplitude of 0.12 mag.[9]
One occultation of a star by Ganymed was observed from California on August 22, 1985.
Further reading
- Fevig, Ronald A.; Fink, U (May 2007). "Spectral observations of 19 weathered and 23 fresh NEAs and their correlations with orbital parameters". Icarus 188 (1): 175–188. doi:.
- Hahn, G. (April 1989). "Physical studies of Apollo-Amor asteroids: UBVRI photometry of 1036 Ganymed and 1627 Ivar". Icarus 78 (2): 363–381. doi:.
External links
- NASA JPL Small-Body Database Browser on 1036 Ganymed
- NASA Planetary Data System: 1036 Ganymed
References
- ^ NASA JPL Small-Body Database Browser on 1036 Ganymed
- ^ Database of Near-Earth Asteroids
- ^ a b c Fieber-Beyer, S. K. (March 12-16, 2007). "Mineralogical Characterization of Near Earth Amor Asteroid 1036 Ganymed". 38th Lunar and Planetary Science Conference 1388: 1695. http://adsabs.harvard.edu/abs/2007LPI....38.1695F.
- ^ http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT
- ^ Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. pp. 391. ISBN 0395348358.
- ^ Putilin, J. (July 1931). "Brightness of the minor planet 1036 Ganymed". Astronomische Nachrichten 242: 213–216. doi:. http://adsabs.harvard.edu/abs/1931AN....242..213P.
- ^ "1036 Ganymed Radar Images". http://naic.edu/~nolan/radar/R1150/.
- ^ a b Nakayama, Hiroyuki (July 2000). "Observations of Polarization and Brightness Variations with the Rotation for Asteroids 9 Metis, 52 Europa, and 1036 Ganymed". Icarus 146 (1): 220–231. doi:.
- ^ Krugly, Yu. N; Gaftonyuk, N. M.; Belskaya, I. N.; Chiorny, V. G.; Shevchenko, V. G.; Velichko, F. P.; Lupishko, D. F.; Konovalenko, A. A. et al. (2007). "Kharkiv study of near-Earth asteroids". Proceedings if IAU Symposium 236: 385–390. doi:. http://books.google.com/books?id=yzcm7zPU9fwC&pg=PA385.
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