493 Griseldis

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

493 Griseldis

Discovery
Discovered by	Max Wolf
Discovery site	Heidelberg
Discovery date	7 September 1902
Designations
MPC designation	(493) Griseldis
Pronunciation	/ɡrɪˈzɛldɪs/
Alternative designations	1902 JS
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	113.61 yr (41495 d)
Aphelion	3.6625 AU (547.90 Gm)
Perihelion	2.5706 AU (384.56 Gm)
Semi-major axis	3.1165 AU (466.22 Gm)
Eccentricity	0.17518
Orbital period	5.50 yr (2009.6 d)
Mean anomaly	193.229°
Mean motion	0° 10^m 44.904^s / day
Inclination	15.177°
Longitude of ascending node	357.360°
Argument of perihelion	47.140°
Physical characteristics
Dimensions	46.41±4.1 km[1]
Rotation period	51.940 h (2.1642 d)[1]
Geometric albedo	0.0622±0.013[1]
Spectral type	P[2]
Apparent magnitude	14.2 to 17.5
Absolute magnitude (H)	10.9[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 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]

References

1. "JPL Small-Body Database Browser: 493 Griseldis (1902 JS)". Jet Propulsion Laboratory. Retrieved 9 May 2016.
2. Tholen, David J.; Sheppard, Scott S.; Trujillo, Chad A. (2015). "Evidence for an Impact Event on (493) Griseldis". American Astronomical Society: 414.03. Bibcode:2015DPS....4741403T.
3. "Main-belt asteroid shows evidence of march collision". Phys.org. 12 November 2015. Retrieved 13 November 2015.
4. Main-Belt Asteroid Shows Evidence of March Collision

External links

• 493 Griseldis at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 493 Griseldis at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters