18 Melpomene
Discovery ^{A} 
Discoverer 
John Russell Hind 
Discovery date 
June 24, 1852 
Alternate
designations 
none ^{B} 
Category 
Main belt 
Orbital elements ^{C D} 
Epoch October 22, 2004 (JD 2453300.5)

Eccentricity (e) 
0.218 
Semimajor axis (a) 
343.443 Gm (2.296 AU) 
Perihelion (q) 
268.472 Gm (1.795 AU) 
Aphelion (Q) 
418.414 Gm (2.797 AU) 
Orbital period (P) 
1270.552 d (3.48 a) 
Mean orbital speed 
19.42 km/s 
Inclination (i) 
10.126° 
Longitude of the
ascending node (Ω)) 
150.547° 
Argument of
perihelion (ω) 
227.975° 
Mean anomaly (M) 
205.245° 
Physical characteristics 
Dimensions 
140.6 km (150—125)^{1} 
Mass 
2.9—10^{18} kg 
Density 
2.0? g/cm³ 
Surface gravity 
0.0393 m/s² 
Escape velocity 
0.0743 km/s 
Rotation period 
0.482 21 d (11.573 h) ^{2} 
Spectral class 
S 
Absolute magnitude 
6.51 
Albedo 
0.223 ^{3} 
Mean surface
temperature 
~177 K 
18 Melpomene (melpom'anee) is a large, bright Main belt asteroid. It is composed of silicates and metals.
It was discovered by J. R. Hind on June 24, 1852 and named after Melpomene, the Muse of tragedy in Greek mythology.
Melpomene occulted the star SAO 114159 on December 11, 1978. A possible Melpomenean satellite with a diameter at least 37 km was detected. The satellite candidate received a provisional designation S/1978 (18) 1 [1].
Melpomene was observed with the Hubble Space Telescope in 1993. It was able to resolve the asteroid's slightly elongated shape, but no satellites were detected [2].
Aspects
Melpomene Stationary, than retrograde May 3rd, 2005
Melpomene Stationary, than retrograde December 6th, 2006
Melpomene Stationary, than retrograde March 10th, 2008
Melpomene Stationary, than retrograde September 13th, 2009
Melpomene Stationary, than retrograde January 29th, 2011
Melpomene Stationary, than retrograde May 9th, 2012
Melpomene Stationary, than retrograde December 11th, 2013
Melpomene Stationary, than retrograde March 15th, 2015
Melpomene Stationary, than retrograde September 25th, 2016
Melpomene Stationary, than retrograde February 1st, 2018
Melpomene Stationary, than retrograde May 17th, 2019
Melpomene Stationary, than retrograde December 16th, 2020
Melpomene Opposition June 18th, 2005 1,36417 AU 9,5 mag
Melpomene Opposition January 23rd, 2007 1,32017 AU 9,2 mag
Melpomene Opposition April 27th, 2008 1,76391 AU 10,3 mag
Melpomene Opposition October 11th, 2009 0,81575 AU 7,9 mag
Melpomene Opposition March 17th, 2011 1,75235 AU 10,2 mag
Melpomene Opposition June 24th, 2012 1,30874 AU 9,4 mag
Melpomene Opposition January 28th, 2014 1,36947 AU 9,3 mag
Melpomene Opposition May 2nd, 2015 1,74544 AU 10,3 mag
Melpomene Opposition October 23rd, 2016 0,83255 AU 8,0 mag
Melpomene Opposition March 21th, 2018 1,76916 AU 10,2 mag
Melpomene Opposition July 2nd, 2019 1,25075 AU 9,2 mag
Melpomene Opposition February 2nd, 2021 1,41678 AU 9,4 mag
Melpomene Stationary, than prograde August 8th, 2005
Melpomene Stationary, than prograde March 7th, 2007
Melpomene Stationary, than prograde June 23rd, 2008
Melpomene Stationary, than prograde November 17th, 2009
Melpomene Stationary, than prograde May 10th, 2011
Melpomene Stationary, than prograde August 12th, 2012
Melpomene Stationary, than prograde March 13th, 2014
Melpomene Stationary, than prograde June 28th, 2015
Melpomene Stationary, than prograde December 1st, 2016
Melpomene Stationary, than prograde May 14th, 2018
Melpomene Stationary, than prograde August 18th, 2019
Melpomene Stationary, than prograde March 19th, 2021
Melpomene Conjunction to sun March 28th, 2006
Melpomene Conjunction to sun September 19th, 2007
Melpomene Conjunction to sun December 22nd, 2008
Melpomene Conjunction to sun July 29th, 2010
Melpomene Conjunction to sun November 3rd, 2011
Melpomene Conjunction to sun April 10th, 2013
Melpomene Conjunction to sun September 22nd, 2014
Melpomene Conjunction to sun December 29th, 2015
Melpomene Conjunction to sun August 3rd, 2017
Melpomene Conjunction to sun November 6th, 2018
Melpomene Conjunction to sun April 24th, 2020
Melpomene Conjunction to sun September 26th, 2021
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