71 Niobe
Encyclopedia : 7 : 71 : 71N : 71 Niobe
| Orbital characteristics [1] | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.755 AU |
| Perihelion distance | 2.270 AU |
| Aphelion distance | 3.240 AU |
| Orbital period | 4.57 years |
| Inclination | 23.26° |
| Eccentricity | 0.176 |
| Physical characteristics [1] | |
| Diameter | 83.4 km |
| Rotation period [3] | 14.38 hours |
| Spectral class | S |
| Albedo [4] | 0.305 |
| Abs magnitude | 7.30 |
| History [2] | |
| Discoverer | R Luther, 1861 |
71 Niobe (nye'-o-bee) is a quite large main belt asteroid It has very bright surface and is probably a mixture of iron-nickel and silicate rock.
It was discovered by Robert Luther on August 13, 1861 and named after Niobe, a character in Greek mythology.
Aspects
| Opposition | Distance at opposition | Brightness at opposition (mag) | Stationary, then prograde | Conjunction to sun | ||
| 2 October 2004 | 28 November 2004 | 2.30546 AU | 12.1 mag | 11 January 2005 | 6 July 2005 | |
| 26 December 2005 | 18 February 2006 | 1.55055 AU | 10.5 mag | 11 April 2006 | 10 November 2006 | |
| 2 June 2007 | 25 July 2007 | 1.56069 AU | 10.6 mag | 15 September 2007 | 6 March 2008 | |
| 11 August 2008 | 17 October 2008 | 2.30755 AU | 12.1 mag | 29 November 2008 | 21 May 2009 | |
| 9 November 2009 | 30 December 2009 | 2.04579 AU | 11.6 mag | 21 February 2010 | 16 August 2010 | |
| 26 February 2011 | 23 April 2011 | 1.40423 AU | 10.4 mag | 24 May 2011 | 14 January 2012 | |
| 1 July 2012 | 3 September 2012 | 1.92930 AU | 11.4 mag | 24 October 2012 | 7 April 2013 | |
| 18 September 2013 | 17 November 2013 | 2.34605 AU | 12.1 mag | 30 December 2013 | 24 June 2014 | |
| 13 December 2014 | 4 February 2015 | 1.66624 AU | 10.6 mag | 31 March 2015 | 15 October 2015 | |
| 19 May 2016 | 6 July 2016 | 1.47293 AU | 10.5 mag | 24 August 2016 | 23 February 2017 | |
| 31 July 2017 | 6 October 2017 | 2.24228 AU | 12.0 mag | 21 November 2017 | 10 May 2018 | |
| 28 October 2018 | 19 December 2018 | 2.15522 AU | 11.8 mag | 7 February 2019 | 1 August 2019 | |
| 30 January 2020 | 27 March 2020 | 1.41986 AU | 10.4 mag | 6 May 2020 | 26 December 2020 |
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