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Discovery[1]
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| Discovered by | Robert H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | 23 June 1990 |
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Designations
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| Minor planet category |
Apollo asteroid NEO PHA |
| Epoch 18 June 2009 | |
| Aphelion | 2.687 AU (249,760,538 miles) |
| Perihelion | 0.556 AU (51,654,487 miles) |
| Semi-major axis | 1.621 AU (150,707,513 miles) |
| Eccentricity | 0.657 |
| Orbital period | 754.03 days |
| Average orbital speed | .4774 deg/day |
| Mean anomaly | 131° 8' 34" |
| Inclination | 24° 23' 55" |
| Longitude of ascending node | 77° 53' 41" |
| Argument of perihelion | 77° 35' 30" |
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Physical characteristics
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| Sidereal rotation period |
14 hours 13 mins |
| Absolute magnitude (H) | 14.1 |
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Additional orbital information
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|---|---|
| Earth MOID | 0.0276364 AU |
| Jupiter Tisserand parameter | 3.976 |
(4953) 1990 MU is an Earth-crossing asteroid belonging to the Apollo family of asteroids which also crosses the orbit of Mars and Venus. 1990 MU is the asteroid's temporary discovery name. It has now been assigned a permanent number from the Minor Planet Center (4953) indicating that its orbit has been confirmed, but has not (at least so far) been assigned a name. Only a small fraction of asteroids have been named.
It has an Earth minimum orbit intersection distance of 0.0276 AU (2,570,000 miles), which is close enough to classify it as a Potentially Hazardous Asteroid (PHA). It will make a close approach to Earth on 6 June 2027 at 0.0308 AU (2,870,000 miles), becoming as bright as apparent magnitude 8.7, and even closer on 5 June 2058 at 0.0231 AU (2,150,000 miles). It will also make a close approach to Venus on 5 October 2012 at 0.0568 AU (5,280,000 miles) and again on 3 September 2041 at 0.0581 AU (5,400,000 miles).
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