4947 Ninkasi, provisional designation 1988 TJ1, is a sub-kilometer asteroid, classified as near-Earth object of the Amor group, approximately 520 meters in diameter. It was discovered on 12 October 1988, by American astronomer Carolyn Shoemaker at Palomar Observatory in California.
| Discovery[1] | |
|---|---|
| Discovered by | C. S. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 12 October 1988 |
| Designations | |
| (4947) Ninkasi | |
| Pronunciation | /nɪŋˈkɑːsi/ |
Named after | Ninkasi |
| 1988 TJ1 | |
| NEO Amor | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 13659 days (37.40 yr) |
| Aphelion | 1.600761485818500 AU (239.47050977701 Gm) |
| Perihelion | 1.13928481550582 AU (170.43458252051 Gm) |
| 1.370023150662 AU (204.9525461487 Gm) | |
| Eccentricity | 0.1684192964511710 |
| 1.60 yr (585.72 d) | |
| 337.8470256565600° | |
| 0° 36m 52.66s / day | |
| Inclination | 15.65150318051197° |
| 215.4605646418820° | |
| 192.858019947831° | |
| Earth MOID | 0.148912 AU (22.2769 Gm) |
| Physical characteristics | |
| Dimensions | 520 meters (est. at 0.20)[3] |
| Sq [2] | |
| 18.0[2] | |
It was named after Ninkasi, the Sumerian goddess of wine and beer, who helped the god Lugalbanda rescue the tablets of fate from the demon Zu.[4]
With an absolute magnitude of 18.0,[2] the asteroid is about 670–1500 meters in diameter.[3] On 2031-Apr-20 the asteroid will pass 0.02917 AU (4,364,000 km; 2,712,000 mi) from Mars.[2]
References
edit- ^ "(4947) Ninkasi = 1988 TJ1". Minor Planet Center. Retrieved 4 June 2015.
- ^ a b c d e "JPL Small-Body Database Browser: 4947 Ninkasi (1988 TJ1)". Jet Propulsion Laboratory. Retrieved 13 April 2016.
- ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 2 November 2017.
- ^ Dictionary of minor planet names, by Lutz D. Schmadel.
External links
edit- 4947 Ninkasi at NeoDyS-2, Near Earth Objects—Dynamic Site
- 4947 Ninkasi at ESA–space situational awareness
- 4947 Ninkasi at the JPL Small-Body Database
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