| Minorplanet: | yes |
| Background: |
|
| 493 Griseldis | |
| Mpc Name: | (493) Griseldis |
| Alt Names: | 1902 JS |
| Discovered: | 7 September 1902 |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Eccentricity: | 0.17518 |
| Semimajor: | 3.1165AU |
| Perihelion: | 2.5706AU |
| Aphelion: | 3.6625abbr=onNaNabbr=on |
| Period: | 5.50 yr (2009.6 d) |
| Inclination: | 15.177° |
| Asc Node: | 357.360° |
| Arg Peri: | 47.140° |
| Abs Magnitude: | 10.9 |
| Rotation: | 51.94abbr=onNaNabbr=on |
| Magnitude: | 14.2 to 17.5 |
| Mean Motion: | / day |
| Observation Arc: | 113.61 yr (41495 d) |
| Uncertainty: | 0 |
493 Griseldis is a fairly dark main-belt asteroid 46 km in diameter.
Griseldis is suspected of having been impacted by another asteroid in March 2015. Other asteroids suspected of an asteroid-on-asteroid impact include 354P/LINEAR 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.[1] 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.[1] Also, no activity was seen in archived images from 2010 or 2012 according to a University of Hawaii press release.[1]