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10 Hygiea
Discovery A
Discoverer A. de Gasparis
Discovery date April 12, 1849
Alternate
designations
none B
Category Main belt
(Hygiea family)
Orbital elements C D
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.119
Semi-major axis (a) 469.345 Gm
(3.137 AU)
Perihelion (q) 413.378 Gm
(2.763 AU)
Aphelion (Q) 525.311 Gm
(3.511 AU)
Orbital period (P) 2029.776 d
(5.56 a)
Mean orbital speed 16.82 km/s
Inclination (i) 3.842°
Longitude of the
ascending node (Ω))
283.646°
Argument of
perihelion (ω)
313.557°
Mean anomaly (M) 273.788°
Physical characteristics
Dimensions 407.1 km
Mass 1.0—1020 kg
Density 2.76 g/cm³ 1
Surface gravity 0.1603 m/s²
Escape velocity 0.2554 km/s
Rotation period 1.1510 d 2
Spectral class C-type asteroid
Absolute magnitude 5.43
Albedo 0.072 3
Mean surface
temperature
~158 K

10 Hygiea (hye-jee'-a or hi-jee'-a) is the fourth largest main belt asteroid with a diameter of 407 km. The dark-coloured surface makes the asteroid dimmer than the size would imply. Hygiea is composed of primitive carbonaceous material similar to the chondrite meteorites. It is the main member of the Hygiea family.

Size comparison: the first 10 asteroids profiled against Earth's Moon. From left to right, 1 Ceres, 2 Pallas, 3 Juno, 4 Vesta, 5 Astraea, 6 Hebe, 7 Iris, 8 Flora, 9 Metis, and 10 Hygiea. [Source]


Hygiea was discovered by A. de Gasparis on April 12, 1849 in Naples, Italy. It was his first of many asteroid discoveries. It is named after Hygieia, the greek goddess of health, daughter of Asclepius (Aesculapius for the Romans). De Gasparis let his friend Ernesto Capocci name the asteroid to thank him for his encouragement.

The Hubble Space Telescope was able to resolve the spherical shape of the asteroid. So far there are 5 observed stellar occultations by 10 Hygiea.












Aspects

Stationary, retrograd Opposition distance to earth (AU) maximum brightness Stationär, prograde conjunction to sun
February 5, 2005 March 26, 2005 1.88360 9.3 mag May 13, 2005 November 21, 2005
May 23, 2006 July 12, 2006 1.86527 9.2 mag August 31, 2006 February 22, 2007
August 8, 2007 October 4, 2007 2.36399 10.1 mag November 23, 2007 May 1, 2008
October 9, 2008 December 3, 2008 2.51309 10.3 mag January 26, 2009 July 4, 2009
December 16, 2009 February 6, 2010 2.16963 9.8 mag March 31, 2010 September 24, 2010
March 27, 2011 May 13, 2011 1.75632 9.1 mag June 28, 2011 January 5, 2012
June 29, 2012 August 22, 2012 2.09214 9.7 mag October 11, 2012 March 26, 2013
September 5, 2013 October 31, 2013 2.49363 10.3 mag December 22, 2013 May 29, 2014
November 7, 2014 December 31, 2014 2.41334 10.1 mag February 23, 2015 August 6, 2015
January 25, 2016 March 15, 2016 1.93746 9.4 mag May 3, 2016 November 8, 2016
May 13, 2017 June 30, 2017 1.82025 9.0 mag August 18, 2017 February 13, 2018
July 31, 2018 September 25, 2018 2.31617 10.1 mag November 15, 2018 April 24, 2019
October 3, 2019 November 27, 2019 2.52255 10.3 mag January 20, 2020 June 26, 2020
December 7, 2020 January 29, 2021 2.22744 9.8 mag March 23, 2021 September 13, 2021


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