Astronomy:493 Griseldis

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Short description: Main-belt asteroid
493 Griseldis
Discovery
Discovered byMax Wolf
Discovery siteHeidelberg
Discovery date7 September 1902
Designations
(493) Griseldis
Pronunciation/ɡrɪˈzɛldɪs/
1902 JS
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc113.61 yr (41495 d)
|{{{apsis}}}|helion}}3.6625 astronomical unit|AU (547.90 Gm)
|{{{apsis}}}|helion}}2.5706 AU (384.56 Gm)
3.1165 AU (466.22 Gm)
Eccentricity0.17518
Orbital period5.50 yr (2009.6 d)
Mean anomaly193.229°
Mean motion0° 10m 44.904s / day
Inclination15.177°
Longitude of ascending node357.360°
47.140°
Physical characteristics
Dimensions46.41±4.1 km[1]
Rotation period51.940 h (2.1642 d)[1]
Geometric albedo0.0622±0.013[1]
P[2]
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]

Overview

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 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.[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]

See also

References

External links