(5496) 1973 NA
| Discovery [1] | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 4 July 1973 |
| Designations | |
| MPC designation | (5496) 1973 NA |
| 1973 NA · 1992 OA | |
| Apollo · NEO | |
| Orbital characteristics [1] | |
| Epoch 2457400.5 · JD 13 January 2016 | |
| Uncertainty parameter 0 | |
| Observation arc | 41.30 yr (15,086 days) |
| Aphelion | 3.9838 AU |
| Perihelion | 0.8866 AU |
| 2.4352 AU | |
| Eccentricity | 0.6358 |
| 3.80 yr (1,388 days) | |
| 85.305° | |
| Inclination | 67.991° |
| 101.07° | |
| 118.01° | |
| Earth MOID | 0.0891 AU |
| Physical characteristics | |
| Dimensions | 1.88 km (calculated)[2] |
| 2.855±0.001 h[lower-alpha 1] | |
| 0.20 (assumed)[2] | |
| S [2] | |
| 16.0[1][2] | |
|
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(5496) 1973 NA, is an unnamed, very eccentric, and heavily tilted asteroid, classified as near-Earth object and Apollo asteroid, that measures about 2 kilometers in diameter. It was discovered on 4 July 1973, by American astronomer Eleanor Helin at the U.S. Palomar Observatory in California.[3]
The asteroid orbits the Sun at a distance of 0.9–4.0 AU once every 3 years and 10 months (1,388 days). Its orbit shows an very high eccentricity of 0.64 and an exceptionally high inclination of 68° with respect to the ecliptic.[1] From 1973–1999, it was the most highly inclined minor planet known.
The stony S-type asteroid was also one of the first known near-Earth asteroids. Its discovery happened just two days after it had passed 0.07984 AU (11,900,000 km) from Earth on one of its closest approaches ever computed.[4] It was then tracked for more than a month, but was not seen again until its next close approach in 1992, when it was recovered as 1992 OA by the Siding Spring Observatory in Australia.[3] Its minimum orbit intersection distance with Earth is now 0.0891 AU (13,300,000 km).[1]
A photometric light-curve analysis from June 2011 gave it a rotation period of 2.855±0.001 hours with a brightness amplitude of 0.15 in magnitude (U=3).[lower-alpha 1] The Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.88 kilometers.[2]
The asteroid is expected to be related to the Quadrantids January meteor shower.[5]
References
- 1 2 Skiff (2011) web: rotation period 2.855±0.001 hours with a brightness amplitude of 0.15 mag. Observation rated Quality Code (U) of 3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (5496) 1973 NA
- 1 2 3 4 5 "JPL Small-Body Database Browser: 5496 (1973 NA)" (2014-10-25 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
- 1 2 3 4 5 "LCDB Data for (5496)". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
- 1 2 "5496 (1973 NA)". Minor Planet Center. Retrieved March 2016.
- ↑ "JPL Small-Body Database Browser: 5496 (1973 NA) – Close-Approach Data". Jet Propulsion Laboratory. Retrieved March 2016.
- ↑ Williams, Iwan P.; Collander-Brown, S. J. (February 1998). "The parent of the Quadrantid meteoroid stream". Monthly Notices of the Royal Astronomical Society 294: 127. Bibcode:1998MNRAS.294..127W. doi:10.1046/j.1365-8711.1998.01168.x. Retrieved March 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- (5496) 1973 NA at the JPL Small-Body Database
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