762 Pulcova

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762 Pulcova
762Pulcova-SwRI.gif
762 Pulcova and satellite as seen with adaptive optics in 2000[1]
Discovery[2]
Discovered by G. N. Neujmin
Discovery date September 3, 1913
Designations
1913 SQ
Minor planet category Main belt
Orbital characteristics[2]
Epoch January 4, 2010 (2455200.5)
Aphelion 3.4744 AU (Q)
Perihelion 2.8343 AU (q)
3.1543 AU (a)
Eccentricity 0.10146
5.60 yr
287.18° (M)
Inclination 13.089°
305.79°
189.06°
Known satellites S/2000 (762) 1[1]
Physical characteristics
Dimensions 137.08 km[2]
Mass 1.40×1018 kg[3]
Mean density
0.90 g/cm3[3]
5.839 hr[2]
Albedo 0.0458[2]
11.93 to 14.79[4]
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.

Photometric observations of this asteroid from Leura, Australia during 2006 gave a light curve with a period of 5.8403 ± 0.0005 hours and a brightness variation of 0.20 ± 0.02 in magnitude. This result is in agreement with previous studies.[5]

Satellite[edit]

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)[6] orbiting Pulcova at a distance of 800 km.[7] Its orbital period is 4 days.[8] The satellite is about 4 magnitudes fainter than the primary.[7] It was one of the first asteroid moons to be identified.

Density[edit]

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.[7] 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.

References[edit]

  1. ^ a b c "762 Pulcova". SwRI. 2000-02-22. Retrieved 2009-10-20.  (AO image)
  2. ^ a b c d e f g h "JPL Small-Body Database Browser: 762 Pulcova (1913 SQ)" (2009-09-22 last obs). Retrieved 2009-10-20. 
  3. ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2008-11-28. 
  4. ^ Magnitudes generated with JPL Horizons for the year 1950 through 2100
  5. ^ Oey, Julian (December 2006), "Lightcurves analysis of 10 asteroids from Leura Observatory", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 33 (4): 96–99, Bibcode:2006MPBu...33...96O. 
  6. ^ Dr. William J. Merline and Maria Martinez (2000-10-26). "Astronomers Image Double Asteroid". SwRI Press Release. Retrieved 2009-10-20.  (mentions both 90 Antiope and 762 Pulcova)
  7. ^ 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. Retrieved 2009-10-21. 
  8. ^ Johnston, Robert (September 1, 2005). "(762) Pulcova". Johnston's Archive. Retrieved 1 November 2013. 

External links[edit]