31 Euphrosyne

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31 Euphrosyne
Discovery
Discovered by: J. Ferguson
Discovery date: September 1, 1854
Alternative names: A907 GP; A918 GB
Minor planet category: Main belt
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion distance: 577.571 Gm (3.861 AU)
Perihelion distance: 364.755 Gm (2.438 AU)
Semi-major axis: 471.163 Gm (3.150 AU)
Eccentricity: 0.226
Orbital period: 2041.585 d (5.59 a)
Avg. orbital speed: 16.57 km/s
Mean anomaly: 14.500°
Inclination: 26.316°
Longitude of ascending node: 31.238°
Argument of perihelion: 61.996°
Physical characteristics
Dimensions: 255.9 km
Mass: ~1.69×1019 kg [1]
Mean density: ~1.9 g/cm³
Equatorial surface gravity: ~0.0679 m/s²
Escape velocity: ~0.1319 km/s
Rotation period: 0.2305 d (5.531 h) [2]
Albedo: 0.0543 [3]
Temperature: ~159 K
Spectral type: ?
Absolute magnitude: 6.74

31 Euphrosyne (IPA: [juˈfɹɒzɪni] or [juˈfɹɒsɪni]) is one of the largest main belt asteroids.

Euphrosyne was discovered by James Ferguson on September 1, 1854. It was the first asteroid found from North America. It is named after Euphrosyne, one of the Charites in Greek mythology.

[edit] Aspects

Stationary,
retrograde		 Opposition Distance to
Earth (AU)		 Maximum
brightness (mag)		 Stationary,
prograde		 Conjunction
to Sun
2 June 2004 19 July 2004 2.89105 12.5 20 September 2004 15 February 2005
5 August 2005 26 September 2005 2.04616 11.2 29 November 2005 9 May 2006
24 December 2006 24 January 2007 1.66730 10.7 18 March 2007 27 September 2007
24 February 2008 26 April 2008 2.40300 11.5 25 June 2008 23 November 2008
20 April 2009 17 June 2009 2.94398 12.6 13 August 2009 12 January 2010
30 June 2010 14 August 2010 2.64946 12.2 21 October 2010 16 March 2011
9 September 2011 3 November 2011 1.62924 10.2 25 December 2011 11 July 2012
26 January 2013 15 March 2013 1.92204 11.0 18 May 2013 25 October 2013
16 March 2014 18 May 2014 2.70365 12.1 15 July 2014 14 December 2014
21 May 2015 10 July 2015 2.94097 12.6 9 September 2015 5 February 2016
25 July 2016 12 September 2016 2.24648 11.6 18 November 2016 20 April 2017
20 November 2017 26 December 2017 1.58396 10.5 6 February 2018 10 September 2018
16 February 2019 16 April 2019 2.25800 11.3 17 June 2019 16 November 2019
8 April 2020 7 June 2020 2.90034 12.5 3 August 2020 3 January 2021

[edit] References

  1. ^ http://www.ipa.nw.ru/PAGE/DEPFUND/LSBSS/engmasses.htm
  2. ^ http://www.psi.edu/pds/archive/lc.html
  3. ^ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab


Minor planets
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Small Solar System bodies

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For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.

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