1720 Niels
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 February 1935 |
| Designations | |
| MPC designation | 1720 Niels |
Named after |
Niels (grandson of discoverer)[2] |
|
1935 CQ · 1940 WH 1951 AL · 1953 VO1 1959 RA · 1963 WE | |
| main-belt · (inner) [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.39 yr (32283 days) |
| Aphelion | 2.4165 AU (361.50 Gm) |
| Perihelion | 1.9611 AU (293.38 Gm) |
| 2.1888 AU (327.44 Gm) | |
| Eccentricity | 0.10402 |
| 3.24 yr (1182.8 d) | |
| 57.413° | |
| 0° 18m 15.732s / day | |
| Inclination | 0.72991° |
| 127.82° | |
| 309.05° | |
| Earth MOID | 0.975783 AU (145.9751 Gm) |
| Jupiter MOID | 2.77632 AU (415.332 Gm) |
| Jupiter Tisserand parameter | 3.667 |
| Physical characteristics | |
| Dimensions |
6.566±0.063 km[4] 8.57 km (calculated)[3] |
|
9.976 h (0.4157 d)[1][5] 19.2 h[6] | |
|
0.2154±0.0284[4] 0.20 (assumed)[3] | |
| S [3] | |
| 12.8 | |
|
| |
1720 Niels, provisional designation 1935 CQ, is a stony asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by Karl Reinmuth at Heidelberg Observatory on 7 February 1935.[7]
The asteroid orbits the Sun at a distance of 2.0–2.4 AU once every 3 years 3 months (1,182 days). Its orbit shows an eccentricity of 0.10 and is nearly coplanar to the plane of the ecliptic, inclined by 1 degree. It has a rotation period of 9.9 and 19 hours depending on two different light-curve analysis.[5][6] The geometric albedo of the S-type asteroid has been determined by the Wide-field Infrared Survey Explorer (WISE) with a value of 0.22.[4]
The minor planet was named by the discoverer after his grandson, Jens. Reinmuth also named 1719 Jens after one of his grandsons.[2]
References
- 1 2 3 "JPL Small-Body Database Browser: 1720 Niels (1935 CQ)" (2015-10-11 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1720) Niels. Springer Berlin Heidelberg. pp. 136–137. ISBN 978-3-540-29925-7. Retrieved November 2015.
- 1 2 3 4 "LCDB Data for (1720) Niels". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015.
- 1 2 Clark, Maurice (March 2007). "Lightcurve Results for 1318 Nerina, 222 Lermontov 3015 Candy, 3089 Oujianquan, 3155 Lee, 6410 Fujiwara, 6500 Kodaira, (8290) 1992 NP, 9566 Rykhlova, (42923) 1999 SR18, and 2001 FY". The Minor Planet Bulletin 34 (1): 19–22. Bibcode:2007MPBu...34...19C. ISSN 1052-8091. Retrieved November 2015.
- 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1720) Niels". Geneva Observatory. Retrieved November 2015.
- ↑ "1720 Niels (1935 CQ)". Minor Planet Center. Retrieved November 2015.
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 (1)-(5000) – Minor Planet Center
- 1720 Niels at the JPL Small-Body Database
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