4341 Poseidon

4341 PoseidonDiscovery [1]

Discovered by| C. Shoemaker
Discovery site| Palomar Obs.
Discovery date| 29 May 1987
Designations

MPC designation

| (4341) Poseidon
Named after| Poseidon
(Greek mythology)[2]

Alternative designations

| 1987 KF
Minor planet category| Apollo * NEO
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 30.05 yr (10,975 days)
|{{{apsis}}}|helion}}| 3.0819 AU
|{{{apsis}}}|helion}}| 0.5881 AU

Semi-major axis

| 1.8350 AU
Eccentricity| 0.6795
Orbital period| 2.49 yr (908 days)
Mean anomaly| 93.192°
Mean motion| 0° 23m 47.4s / day
Inclination| 11.852°
Longitude of ascending node| 108.11°

|{{{apsis}}}|helion}}

| 15.652°
Earth MOID| 0.1941 AU * 75.6 LD
Physical characteristics
Mean diameter| 2.32 km (derived)[3]
Rotation period| 6.262 h[4]
6.2656 h[5]
Geometric albedo| 0.18 (assumed)[3]

Spectral type

| SMASS = O [1][3]
Absolute magnitude (H)| 15.65[3][5] * 16.0[1] * 16.11±0.80[6]

4341 Poseidon (prov. designation: 1987 KF) is a rare-type asteroid classified as near-Earth object of the Apollo group, approximately 2.3 kilometers (1.4 miles) in diameter. It was discovered by American astronomer Carolyn Shoemaker at Palomar Observatory on 29 May 1987.[7] The asteroid was named after Poseidon from Greek mythology.[2]

## Contents

* 1 Orbit and classification
* 2 Naming
* 3 Physical characteristics
* 3.1 Diameter and albedo
* 3.2 Lightcurves
* 4 References
* 5 External links

## Orbit and classification

Poseidon orbits the Sun at a distance of 0.6–3.1 AU once every 2 years and 6 months (908 days). Its orbit has an eccentricity of 0.68 and an inclination of 12° with respect to the ecliptic.[1]

As no precoveries were taken, the asteroid's observation arc begins with its discovery in 1987.[7] Poseidon may be associated with the Taurid Complex of meteor showers.[8] It has an Earth minimum orbital intersection distance of 0.1941 AU (29,000,000 km), which corresponds to 75.6 lunar distances.[1]

## Naming

This minor planet was named for the "God of the Sea", Poseidon, one of the Twelve Olympians in Greek mythology. He was also referred to as "Earth-Shaker" due to his role in provoking earthquakes, which were then thought to be caused by ocean waves beating on the shore. He was the brother of Zeus (see 5731 Zeus), and an enemy of the Trojans in the Trojan War.[2] The naming citation was published by the Minor Planet Center on 30 January 1991 (M.P.C. 17656).[9]

## Physical characteristics

In the SMASS classification, Poseidon is an O-type asteroid.[1]

### Diameter and albedo

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.32 kilometers with an absolute magnitude of 15.65.[3] As of 2017, no other estimates for its diameter and albedo have been published.[1][3]

### Lightcurves

In 1998, a rotational lightcurve of Poseidon was published from photometric observations made by Czech astronomer Petr Pravec at Ondřejov Observatory. It gave a period of 6.262 hours with a brightness variation of 0.08 magnitude ({{{1}}}).[4]

A second lightcurve was obtained during the  Near-Earth Objects Follow-up Program which gave a concurring period of 6.2656 hours and an amplitude of 0.07 magnitude ({{{1}}}).[5] A low brightness variation typically indicates that the body has a nearly spheroidal shape.

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 4341 Poseidon (1987 KF)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004341.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(4341) Poseidon". Dictionary of Minor Planet Names – (4341) Poseidon. Springer Berlin Heidelberg. p. 372. doi:10.1007/978-3-540-29925-7_4293. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (4341) Poseidon". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4341|Poseidon.
4. ↑ 4.0 4.1 Pravec, Petr; Wolf, Marek; Sarounová, Lenka (November 1998). "Lightcurves of 26 Near-Earth Asteroids". Icarus 136 (1): 124–153. doi:10.1006/icar.1998.5993. Bibcode: 1998Icar..136..124P. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1998Icar..136..124P. Retrieved 27 October 2016.
5. ↑ 5.0 5.1 5.2 Krugly, Yu. N.; Belskaya, I. N.; Shevchenko, V. G.; Chiorny, V. G.; Velichko, F. P.; Mottola, S. et al. (August 2002). "The Near-Earth Objects Follow-up Program. IV. CCD Photometry in 1996-1999". Icarus 158 (2): 294–304. doi:10.1006/icar.2002.6884. Bibcode: 2002Icar..158..294K. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2002Icar..158..294K. Retrieved 27 October 2016.
6. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 27 October 2016.
7. ↑ 7.0 7.1 "4341 Poseidon (1987 KF)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4341.
8. ↑ Babadzhanov, P. B. (2001). "Search for meteor showers associated with Near-Earth Asteroids". Astronomy and Astrophysics 373 (1): 329–335. doi:10.1051/0004-6361:20010583. Bibcode: 2001A&A...373..329B.
9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## 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
* 4341 Poseidon at NeoDyS-2, Near Earth Objects—Dynamic Site
* Ephemeris * Obs prediction * Orbital info * MOID * Proper elements * Obs info * Close * Physical info * NEOCC
* 4341 Poseidon at ESA–space situational awareness
* Ephemerides * Observations * Orbit * Physical Properties * Summary
* 4341 Poseidon at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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