42 Isis
From Wikipedia, the free encyclopedia
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Discovery
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| Discovered by | Norman Robert Pogson |
| Discovery date | May 23, 1856 |
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Designations
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| Named after | Isis |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Adjective | Isidian |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 446.706 Gm (2.986 AU) |
| Perihelion | 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) |
| Average orbital speed | 18.82 km/s |
| Mean anomaly | 121.874° |
| Inclination | 8.530° |
| Longitude of ascending node | 84.398° |
| Argument of perihelion | 236.626° |
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Physical characteristics
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| 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 (geometric)[1] |
| Temperature | ~178 K |
| Spectral type | S |
| Apparent magnitude | 9.18[2] to 13.50 |
| Absolute magnitude (H) | 7.53 |
42 Isis (
/ˈaɪsɨs/) is a large main-belt asteroid, measuring 100.2km in diameter. It was discovered by N.R. Pogson on May 23, 1856, at Oxford. It was Pogson's first asteroid discovery.
The asteroid's name was chosen by Manuel John Johnson, director of the Radcliffe Observatory in Oxford. Although Isis is the name of an Egyptian goddess, the name was probably chosen in homage to Pogson's astronomer daughter, Elizabeth Isis Pogson. In addition, the Isis is the stretch of the River Thames that runs through Oxford.[3]
[edit] References
- ^ Asteroid Data Sets
- ^ "AstDys (42) Isis Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.1&n=42&oc=500&y0=1963&m0=7&d0=4&h0=0&mi0=0&y1=1963&m1=7&d1=4&h1=0&mi1=0&ti=1.0&tiu=days. Retrieved 2010-06-27.
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names: Addendum to Fifth Edition: 2006 - 2008.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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