762 Pulcova
762 Pulcova and satellite as seen with adaptive optics in 2000[1]
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Discovery[2]
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| Discovered by | G. N. Neujmin |
| Discovery date | September 3, 1913 |
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Designations
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| Alternate name(s) | 1913 SQ |
| Minor planet category |
Main belt |
| Epoch January 4, 2010 (2455200.5) | |
| Aphelion | 3.4744 AU (Q) |
| Perihelion | 2.8343 AU (q) |
| Semi-major axis | 3.1543 AU (a) |
| Eccentricity | 0.10146 |
| Orbital period | 5.60 yr |
| Mean anomaly | 287.18° (M) |
| Inclination | 13.089° |
| Longitude of ascending node | 305.79° |
| Argument of perihelion | 189.06° |
| Satellites | S/2000 (762) 1[1] |
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Physical characteristics
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| Dimensions | 137.08 km[2] |
| Mass | 1.40×1018 kg[3] |
| Mean density | 0.90 g/cm3[3] |
| Sidereal rotation period |
5.839 hr[2] |
| Albedo | 0.0458[2] |
| Apparent magnitude | 11.93 to 14.79[4] |
| Absolute magnitude (H) | 8.28[2] |
762 Pulcova is a main-belt asteroid. It was discovered by Grigoriy N. Neujmin in 1913,[2] and is named after Pulkovo Observatory, near Saint Petersburg. Pulcova is 137 km in diameter,[2] and is a C-type asteroid, which means that it is dark in colouring with a carbonate composition.
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[edit] Satellite
On February 22, 2000,[1] astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, discovered a small, 15-km moon (roughly a 10th the size of the primary)[5] orbiting Pulcova at a distance of 800 km.[6] The satellite is about 4 magnitudes fainter than the primary.[6] It was one of the first asteroid moons to be identified.
[edit] Density
In the year 2000, Merline estimated Pulcova to have a density of 1.8 g/cm³, which would make it more dense than the binary asteroids 45 Eugenia and 90 Antiope.[6] But estimates by Marchis in 2008 suggest a density of only 0.90 g/cm³,[3] suggesting it may be a loosely-packed rubble pile, not a monolithic object.
[edit] References
- ^ a b c "762 Pulcova". SwRI. 2000-02-22. http://www.boulder.swri.edu/merline/press/fig3.html. Retrieved 2009-10-20. (AO image)
- ^ a b c d e f g h "JPL Small-Body Database Browser: 762 Pulcova (1913 SQ)". 2009-09-22 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=762. Retrieved 2009-10-20.
- ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2008-11-28.
- ^ Magnitudes generated with JPL Horizons for the year 1950 through 2100
- ^ Dr. William J. Merline and Maria Martinez (2000-10-26). "Astronomers Image Double Asteroid". SwRI Press Release. http://www.boulder.swri.edu/merline/press/release.txt. Retrieved 2009-10-20. (mentions both 90 Antiope and 762 Pulcova)
- ^ a b c W.J. Merline (SwRI), L.M. Close (ESO, U. Arizona), C. Dumas (JPL), J.C. Shelton (Mt. Wilson Obs.), F. Menard (CFHT), C.R. Chapman, D.C. Slater (SwRI) (2000-06-21). "Discovery of Companions to Asteroids 762 Pulcova and 90 Antiope by Direct Imaging". SwRI. http://www.boulder.swri.edu/merline/press/dps.abstract.pdf. Retrieved 2009-10-21.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
- (762) Pulcova (Robert Johnston)
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