Astronomy:6469 Armstrong
| Discovery [1] | |
|---|---|
| Discovered by | A. Mrkos |
| Discovery site | Kleť Obs. |
| Discovery date | 14 August 1982 |
| Designations | |
| (6469) Armstrong | |
| Named after | Neil Armstrong (astronaut, Apollo 11)[2] |
| 1982 PC · 1969 UK1 1972 NN · 1979 WZ6 1982 QL | |
| Minor planet category | main-belt · Flora [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.45 yr (17,332 days) |
| |{{{apsis}}}|helion}} | 2.6725 AU |
| |{{{apsis}}}|helion}} | 1.7663 AU |
| 2.2194 AU | |
| Eccentricity | 0.2041 |
| Orbital period | 3.31 yr (1,208 days) |
| Mean anomaly | 226.43° |
| Mean motion | 0° 17m 53.16s / day |
| Inclination | 3.9595° |
| Longitude of ascending node | 159.41° |
| 150.61° | |
| Physical characteristics | |
| Dimensions | 2.89 km (calculated)[3] 3.720±0.392 km[4][5] |
| Rotation period | 5.9648±0.1423 h[6] 6.040±0.040 h[7] |
| Geometric albedo | 0.24 (assumed)[3] 0.243±0.039[4][5] |
| S [3] | |
| Absolute magnitude (H) | 14.5[1] · 14.340±0.250 (R)[7] · 14.3[4] · 14.416±0.007 (R)[6] · 14.87[3] |
6469 Armstrong, provisional designation 1982 PC, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered by Czech astronomer Antonín Mrkos at Kleť Observatory on 14 August 1982.[8] The asteroid was later named for American astronaut Neil Armstrong.[2]
Orbit and classification
Armstrong is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,208 days). Its orbit has an eccentricity of 0.20 and an inclination of 4° with respect to the ecliptic.[1]
In October 1969, it was first identified as 1969 UK1 at Crimea–Nauchnij. The body's observation arc began 10 years prior to its official discovery at Klet Observatory, with a precovery taken at Crimea–Nauchnij in July 1972.[8]
Physical characteristics
Armstrong is a presumed S-type asteroid.[3]
Rotation period
Two rotational lightcurves of Armstrong were obtained from photometric observations made at the Palomar Transient Factory, California, in January and February 2014. The lightcurves gave a concurring rotation period of 6.040±0.040 and 5.9648±0.1423 hours with a brightness variation of 0.65 and 0.70 in magnitude, respectively ({{{1}}}).[7][6]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Armstrong measures 3.7 kilometers in diameter and its surface has an albedo of 0.24.[4][5]
The Collaborative Asteroid Lightcurve Link assumes an identical albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its orbital family – and calculates a diameter of 2.9 kilometers, based on a weaker absolute magnitude of 14.87.[3]
Naming
This minor planet was named after American astronaut Neil Armstrong, on the occasion of the 30th anniversary of the Apollo 11 mission.[2]
On 20 July 1969, Armstrong was one of the first two humans to land on the Moon, and the first person to walk on it, shortly followed by Buzz Aldrin, after whom the asteroid 6470 Aldrin is named. The minor planet 6471 Collins is named after Michael Collins, the third crew member of the Apollo 11 mission. In 1966, Armstrong also conducted the first docking in space together with David Scott aboard Gemini 8. The asteroid's name was suggested by Czech astronomers Jana Tichá, Miloš Tichý and Zdeněk Moravec, who observed it during its 1995-opposition, shortly before being numbered.[2] The approved naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34623).[9]
The lunar crater Armstrong is also named in his honor.
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 6469 Armstrong (1982 PC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006469.
- ↑ 2.0 2.1 2.2 2.3 Schmadel, Lutz D. (2007). "(6469) Armstrong". Dictionary of Minor Planet Names – (6469) Armstrong. Springer Berlin Heidelberg. pp. 534–535. doi:10.1007/978-3-540-29925-7_5888. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (6469) Armstrong". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=6469%7CArmstrong.
- ↑ 4.0 4.1 4.2 4.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 10 May 2016.
- ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 5 December 2016.
- ↑ 6.0 6.1 6.2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 10 May 2016.
- ↑ 7.0 7.1 7.2 Chang, Chan-Kao (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series 219 (2): 19. doi:10.1088/0067-0049/219/2/27. Bibcode: 2015ApJS..219...27C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJS..219...27C. Retrieved 10 May 2016.
- ↑ 8.0 8.1 "6469 Armstrong (1982 PC)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=6469.
- ↑ "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
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 6469 Armstrong at AstDyS-2, Asteroids—Dynamic Site
- 6469 Armstrong at the JPL Small-Body Database
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