1750 Eckert
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 15 July 1950 |
| Designations | |
| MPC designation | 1750 Eckert |
Named after |
Wallace Eckert (astronomer)[2] |
| 1950 NA1 · 1950 OA | |
| Mars-crosser · Hungaria [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.68 yr (23989 days) |
| Aphelion | 2.2593 AU (337.99 Gm) |
| Perihelion | 1.5942 AU (238.49 Gm) |
| 1.9268 AU (288.25 Gm) | |
| Eccentricity | 0.17258 |
| 2.67 yr (976.87 d) | |
| 124.85° | |
| 0° 22m 6.672s / day | |
| Inclination | 19.083° |
| 273.79° | |
| 108.96° | |
| Earth MOID | 0.693338 AU (103.7219 Gm) |
| Jupiter MOID | 3.24056 AU (484.781 Gm) |
| Jupiter Tisserand parameter | 3.833 |
| Physical characteristics | |
| Dimensions |
6.95±0.21 km[4] 6.97 km (calculated)[3] |
|
375 h (15.6 d)[1][5] 4.49±0.01 h[6] | |
|
0.203±0.013[4] 0.20 (assumed)[3] | |
|
B–V = 0.885 U–B = 0.500 Tholen = S S [3] | |
| 13.15 | |
|
| |
1750 Eckert, provisional designation 1950 NA1, is a stony asteroid, slow rotator, and Mars-crosser from the inner regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 15 July 1950.[7]
The asteroid is a member of the Hungaria family, a group that forms the innermost dense concentration of asteroids in the Solar System. It measures about 7 kilometers in diameter and orbits the Sun at a distance of 1.6–2.3 AU once every 2 years and 8 months (977 days). Its orbit shows an eccentricity of 0.17 and is tilted by 19 degrees to the plane of the ecliptic. Every 375 hours, it slowly rotates once around its axis.[5] This is the sixth-longest rotation period of all known Mars-crossing asteroids.[8] The S-type asteroid has an albedo of 0.20, based on observations by the Japanese Akari satellite.[4]
The minor planet was named in memory of American astronomer Wallace Eckert (1902–1971), director at the United States Naval Observatory from 1940 to 1945, president of IAU's Commission 7, and pioneer in the use of automatic computing machines. In the late 1940s and early 1950s, he used the then most powerful computing machines ever built, SSEC and NORC, for astronomical calculations. The asteroid 1625 The NORC was named after one of these early super-computers. Eckert also produced the integration of the orbits of the five outer planets in collaboration with Brouwer and Clemence, after whom the minor planets 1746 Brouwer and 1919 Clemence were named. By use of sophisticated computing techniques, Eckert was able to check and extend Brown's lunar theory (also see 1643 Brown).[2]
References
- 1 2 3 "JPL Small-Body Database Browser: 1750 Eckert (1950 NA1)" (2014-11-30 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1750) Eckert. Springer Berlin Heidelberg. p. 139. ISBN 978-3-540-29925-7. Retrieved November 2015.
- 1 2 3 4 "LCDB Data for (1750) Eckert". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
- 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
- 1 2 Warner, Brian D. (April 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 September-December". The Minor Planet Bulletin 37 (2): 57–64. Bibcode:2010MPBu...37...57W. ISSN 1052-8091. Retrieved November 2015.
- ↑ Bonzo, Dimitrij; Carbognani, Albino (July 2010). "Lightcurves and Periods for Asteriods 1001 Gaussia, 1060 Magnolia, 1750 Eckert, 2888 Hodgson, and 3534 Sax". The Minor Planet Bulletin 37 (3): 93–95. Bibcode:2010MPBu...37...93B. ISSN 1052-8091. Retrieved November 2015.
- ↑ "1750 Eckert (1950 NA1)". Minor Planet Center. Retrieved November 2015.
- ↑ "JPL Small-Body Database Search Engine: orbital class (MCA) and rot_per > 0 (h)". JPL Solar System Dynamics. Retrieved November 2015.
External links
- About NORC: Smartest Brain Joins The Navy (1954) on YouTube (time 0:45 min.)
- 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
- 1750 Eckert at the JPL Small-Body Database
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