42 Isis
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| Discovery | |
|---|---|
| Discovered by: | Norman Robert Pogson |
| Discovery date: | May 23, 1856 |
| Alternative names: | |
| Minor planet category: | Main belt |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 446.706 Gm (2.986 AU) |
| Perihelion distance: | 283.890 Gm (1.898 AU) |
| Semi-major axis: | 365.298 Gm (2.442 AU) |
| Eccentricity: | 0.223 |
| Orbital period: | 1393.737 d (3.82 a) |
| Avg. orbital speed: | 18.82 km/s |
| Mean anomaly: | 121.874° |
| Inclination: | 8.530° |
| Longitude of ascending node: | 84.398° |
| Argument of perihelion: | 236.626° |
| Physical characteristics | |
| Dimensions: | 100.2 km |
| Mass: | 1.1×1018 kg |
| Mean density: | ? g/cm³ |
| Equatorial surface gravity: | 0.0280 m/s² |
| Escape velocity: | 0.0530 km/s |
| Rotation period: | ? d |
| Albedo: | 0.171 [1] |
| Temperature: | ~178 K |
| Spectral type: | S |
| Absolute magnitude: | 7.53 |
42 Isis (IPA: [ˈaɪzɪs] or [ˈaɪsɪs]) is a large main belt asteroid. Isis was discovered by N. R. Pogson on May 23, 1856. It was his first asteroid discovery. It is named after Isis, the classical (Greek) name of an Egyptian goddess.
[edit] Aspects
| Stationary, retrograde |
Opposition | Distance to Earth (AU) |
Maximum brightness (mag) |
Stationary, prograde |
Conjunction to Sun |
|---|---|---|---|---|---|
| 18 June 2005 | 20 July 2005 | 0.91058 | 9.2 | 27 August 2005 | 8 May 2006 |
| 12 November 2006 | 2 January 2007 | 1.82711 | 11.3 | 23 February 2007 | 14 August 2007 |
| 2 February 2008 | 20 March 2008 | 1.82076 | 11.5 | 17 May 2008 | 18 November 2008 |
| 9 August 2009 | 10 September 2009 | 0.94491 | 9.5 | 23 October 2009 | 2 June 2010 |
| 27 November 2010 | 17 January 2011 | 1.93864 | 11.6 | 11 March 2011 | 28 August 2011 |
| 21 February 2012 | 6 April 2012 | 1.65078 | 11.1 | 2 June 2012 | 20 December 2012 |
| 9 September 2013 | 21 October 2013 | 1.14039 | 10.0 | 6 December 2013 | 22 June 2014 |
| 12 December 2014 | 31 January 2015 | 1.99996 | 11.7 | 27 March 2015 | 12 September 2015 |
| 14 March 2016 | 27 April 2016 | 1.43075 | 10.6 | 20 June 2016 | 31 January 2017 |
| 1 October 2017 | 18 November 2017 | 1.37566 | 10.4 | 5 January 2018 | 9 July 2018 |
| 27 December 2018 | 13 February 2019 | 2.01003 | 11.8 | 11 April 2019 | 29 September 2019 |
| 12 April 2020 | 25 May 2020 | 1.17882 | 9.9 | 12 July 2020 | 19 March 2021 |
[edit] References
| Minor planets | ||
|---|---|---|
| Previous minor planet | 42 Isis | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
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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