18 Melpomene
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Discovery
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| Discovered by | John Russell Hind |
| Discovery date | June 24, 1852 |
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Designations
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| Named after | Melpomène |
| Alternate name(s) | none |
| Minor planet category |
Main belt |
| Epoch October 22, 2004 (JD 2453300.5) | |
| Aphelion | 418.414 Gm (2.797 AU) |
| Perihelion | 268.472 Gm (1.795 AU) |
| Semi-major axis | 343.443 Gm (2.296 AU) |
| Eccentricity | 0.218 |
| Orbital period | 1270.552 d (3.48 a) |
| Average orbital speed | 19.42 km/s |
| Mean anomaly | 205.245° |
| Inclination | 10.126° |
| Longitude of ascending node | 150.547° |
| Argument of perihelion | 227.975° |
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Physical characteristics
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| Dimensions | 170x155x129 km[2] (150×125 km)[3] (150×170 km)[4] 140.6 ± 2.8 km (IRAS)[1] |
| Mass | 3.0×1018 kg[2] |
| Mean density | 1.69±0.66 g/cm3[2] |
| Equatorial surface gravity | ~0.0393 m/s2 |
| Escape velocity | ~0.0743 km/s |
| Rotation period | 0.482 21 d (11.57 h)[1][5] |
| Albedo | 0.223 (geometric) [1][6] |
| Temperature | ~177 K |
| Spectral type | S[1] |
| Apparent magnitude | 7.5[7] to 12.0 |
| Absolute magnitude (H) | 6.51[1] |
| Angular diameter | 0.23" to 0.059" |
18 Melpomene (
/mɛlˈpɒmɨniː/ mel-pom-i-nee; Greek: Μελπομένη) is a large, bright main-belt asteroid. It is composed of silicates and metals.
It was discovered by J. R. Hind on June 24, 1852, and named after Melpomene, the Muse of tragedy in Greek mythology.
Melpomene occulted the star SAO 114159 on December 11, 1978. A possible Melpomenean satellite with a diameter at least 37 km was detected. The satellite candidate received a provisional designation S/1978 (18) 1.[8]
Melpomene was observed with the Hubble Space Telescope in 1993. It was able to resolve the asteroid's slightly elongated shape, but no satellites were detected.[3]
Melpomene has been studied by radar.[9]
[edit] Notes
- ^ a b c d e f "JPL Small-Body Database Browser: 18 Melpomene". 2008-09-21 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=18. Retrieved 2008-11-26.
- ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2008-11-27.
- ^ a b Storrs, Alex; Weiss; Zellner; Burlsen; et al. (1999). "Imaging Observations of Asteroids with Hubble Space Telescope". Icarus 137 (2): 260–268. Bibcode 1999Icar..137..260S. doi:10.1006/icar.1999.6047. http://web.media.mit.edu/~win/hstpub.pdf. Retrieved 2008-11-03.
- ^ Storrs, Alex; Dunne; Conan; Mugnier; et al. (2005). "A closer look at main belt asteroids 1: WF/PC images". Icarus 173 (2): 409–416. Bibcode 2005Icar..173..409S. doi:10.1016/j.icarus.2004.08.007. http://scripts.mit.edu/~paleomag/articles/Storrs_Weiss_2005_Icarus.pdf. Retrieved 2008-11-26.
- ^ "LIGHTCURVES AND MAP DATA ON NUMBERED ASTEROIDS N° 1 TO 52225". AstroSurf. Archived from the original on 2005-11-27. http://web.archive.org/web/20051127063200/http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm. Retrieved 2008-11-03.
- ^ "Asteroid Data Archive". Planetary Science Institute. Archived from the original on 2006-06-23. http://web.archive.org/web/20060623213811/http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab. Retrieved 2008-11-03.
- ^ Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. p. 391. ISBN 0-395-34835-8.
- ^ "IAUC 3315: 1978 (18) 1; WZ Sge". Central Bureau for Astronomical Telegrams. http://www.cbat.eps.harvard.edu/iauc/03300/03315.html. Retrieved 2011-07-05.
- ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. http://echo.jpl.nasa.gov/asteroids/. Retrieved 2011-10-30.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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