Astronomy:493 Griseldis

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493 Griseldis
Discovered byMax Wolf
Discovery siteHeidelberg
Discovery date7 September 1902
(493) Griseldis
1902 JS
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc113.61 yr (41495 d)
Aphelion3.6625 astronomical unit|AU (547.90 Gm)
Perihelion2.5706 AU (384.56 Gm)
3.1165 AU (466.22 Gm)
Orbital period5.50 yr (2009.6 d)
Mean anomaly193.229°
Mean motion0° 10m 44.904s / day
Longitude of ascending node357.360°
Physical characteristics
Dimensions46.41±4.1 km[1]
Rotation period51.940 h (2.1642 d)[1]
Geometric albedo0.0622±0.013[1]
Apparent magnitude14.2 to 17.5
Absolute magnitude (H)10.9[1]

Griseldis (minor planet designation: 493 Griseldis) is a fairly dark main-belt asteroid 46 km in diameter.[1]


Griseldis is suspected of having been impacted by another asteroid in March 2015.[2][3] Other asteroids suspected of an asteroid-on-asteroid impact include P/2010 A2 and 596 Scheila which also showed extended features (tails).

The asteroid was observed with the Subaru telescope (8m), the Magellan Telescopes (6.5), and also the University of Hawaii 2.2 m telescope in early 2015.[4] The activity was detected on the Subaru in late March, and confirmed on the Magellan telescope a few days later (which is in Chile), but no activity was seen by April.[4] Also, no activity was seen in archived images from 2010 or 2012 according to a University of Hawaii press release.[4]


External links