|Discovered by||C. J. van Houten
I. van Houten-G.
|Discovery site||Palomar Obs.|
|Discovery date||24 September 1960|
|MPC designation||(1809) Prometheus|
(Greek mythology) 
|2522 P-L · 1943 EA1
1955 SW · 1955 VA
|main-belt · (outer)|
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 0|
|Observation arc||61.53 yr (22,473 days)|
|5.00 yr (1,827 days)|
|0° 11m 49.2s / day|
|Dimensions||±0.097 km 14.212|
1809 Prometheus (// prə-MEE-thee-əs), provisional designation 2522 P-L, is an asteroid from the outer region of the asteroid belt, approximately 14 kilometers in diameter. Discovered during the Palomar–Leiden survey in 1960, it was named after Prometheus from Greek mythology.
It was discovered on 24 September 1960, by the Dutch astronomer couple Ingrid and Cornelis Johannes van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar, California, in the United States. On the same night, the team of astronomers discovered several other minor planets including 1810 Epimetheus.
Prometheus was first identified as 1943 EA1 at the Hungarian Konkoly Observatory in 1943. In 1955, its first used observation was taken at Goethe Link Observatory, when it was identified as 1955 SW, extending the body's observation arc by 5 years prior to its official discovery observation.
The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden, where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets.
Orbit and classification
Prometheus orbits the Sun in the outer main-belt at a distance of 2.6–3.2 AU once every 5.00 years (1,827 days). Its orbit has an eccentricity of 0.10 and an inclination of 3° with respect to the ecliptic.
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Prometheus measures 14.2 kilometers in diameter, and its surface has an albedo of 0.126. As of 2017, its spectral type, rotation period and shape remain unknown.
This minor planet was named for Prometheus, a Titan from Greek mythology, who stole the fire from the gods. The name has also been given to a moon of Saturn, Prometheus (moon), discovered by the Voyager 1 spacecraft in 1980. The asteroid 1810 Epimetheus is named after his brother. The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3934).
- "JPL Small-Body Database Browser: 1809 Prometheus (2522 P-L)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 3 June 2017.
- Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1809) Prometheus. Springer Berlin Heidelberg. p. 145. ISBN 978-3-540-00238-3. Retrieved 15 December 2016.
- Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. Bibcode:2014ApJ...791..121M. arXiv: . doi:10.1088/0004-637X/791/2/121. Retrieved 15 December 2016.
- "1809 Prometheus (2522 P-L)". Minor Planet Center. Retrieved 15 December 2016.
- "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 15 December 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 December 2016.
- 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
- 1809 Prometheus at the JPL Small-Body Database