49 Pales
![]() Orbital diagram | |
Discovery[1] | |
---|---|
Discovered by | Hermann Goldschmidt |
Discovery site | Paris Observatory |
Discovery date | 19 September 1857 |
Designations | |
Designation | (49) Pales |
Pronunciation | /ˈpeɪliːz/[2] |
Named after | Pales |
Main belt[1] | |
Adjectives | Palian/ˈpeɪliən/;Palilian/pəˈlɪliən/(adj. only) |
Orbital characteristics[3] | |
Epoch23 March 2018 (JD2458200.5) | |
Aphelion | 3.7989AU |
Perihelion | 2.4030 AU |
3.10093 AU | |
Eccentricity | 0.22507 |
1994.51 days (5.46 years) | |
169.53° | |
Inclination | 3.17° |
285.646° | |
111.146° | |
Physical characteristics | |
Dimensions | 149.80±3.8 km Mean diameter[4] |
Mass | 2.69×1018kg[5] |
Albedo | 0.0597±0.003[4] |
Spectral type | C[9] |
7.8[10] | |
49 Pales(/ˈpeɪliːz/) is a large, darkmain-beltasteroid.It was discovered by German-French astronomerHermann Goldschmidton 19 September 1857 from his balcony inParis.[11]The asteroid is named afterPales,the goddess ofshepherdsinRoman mythology.Since it was discovered on the same night as48 Doris,geologistÉlie de Beaumontsuggested naming the two "The Twins".[12]
The orbit of this asteroid has close to a 2:1commensurabilitywith the orbit ofJupiter.[13]On 17 January 2000, this minor planet was observedoccultinga 9th magnitude star from seven locations. These timed chords across the silhouette allowed an estimate to be made of the object's dimensions,[14]yielding a cross-section of251 km × 160 km.[15]
Pales has been studied byradar.[16]It has a rotation period of20.705±0.002 hand a lightcurve with an amplitude of 0.18 mag. The lightcurve shows 4 maxima and 4 minima per cycle, suggesting an irregular shape.[7]The previously accepted period of 10.42 hours with 2 maxima and minima per cycle[17]was proven to be wrong by Pilcher in 2016, showing that correct rotation periods still have not been found for all low-numbered asteroids.[8]
References
[edit]- ^ab"49 Pales".JPL Small-Body Database.Jet Propulsion Laboratory.Retrieved26 June2018.
- ^Noah Webster (1884)A Practical Dictionary of the English Language
- ^"(49) Pales".AstDyS.Italy:University of Pisa.Archived fromthe originalon 27 February 2012.Retrieved29 December2008.
- ^abTedesco; et al. (2004)."Supplemental IRAS Minor Planet Survey (SIMPS)".IRAS-A-FPA-3-RDR-IMPS-V6.0.Planetary Data System.Archived fromthe originalon 17 August 2009.Retrieved29 December2008.
- ^Jim Baer (2008)."Recent Asteroid Mass Determinations".Personal Website. Archived fromthe originalon 29 January 2009.Retrieved29 December2008.
- ^Romeuf, David; Behrend, Raoul (7 January 2016)."Courbes de rotation d'astéroïdes et de comètes"(in French).Retrieved26 June2018.
- ^abPilcher, Frederick (2017)."Rotation Period Determinations for 49 Pales, 96 Aegle, 106 Dione 375 Ursula, and 576 Emanuela".Minor Planet Bulletin.Retrieved26 June2018.
- ^abPilcher, Frederick; Benishek, Vladimir; Klinglesmith, Daniel A. (2016)."Rotation Period, Color Indices, and H-G parameters for 49 Pales".Minor Planet Bulletin.Retrieved26 June2018.
- ^Neese (2005)."Asteroid Taxonomy".EAR-A-5-DDR-TAXONOMY-V5.0.Planetary Data System.Archived fromthe originalon 5 August 2009.Retrieved27 December2008.
- ^Tholen (2007)."Asteroid Absolute Magnitudes".EAR-A-5-DDR-ASTERMAG-V11.0.Planetary Data System.Archived fromthe originalon 16 August 2009.Retrieved29 December2008.
- ^"Discovery Circumstances: Numbered Minor Planets (1)–(5000)".IAU: Minor Planet Center.Archivedfrom the original on 2 February 2009.Retrieved29 December2008.
- ^Schmadel, Lutz(2003),Dictionary of minor planet names(fifth ed.), Germany: Springer, p. 19,ISBN3-540-00238-3.
- ^Fernández, S.; Beaugé, C. (1988). "Asteroids in the 1:3:2 Commensurability". In Valtonen, Mauri (ed.).The Few Body Problem: Proceedings of the 96th Colloquium of the International Astronomical Union Held in Turku, Finland, June 14–19, 1987.Astrophysics and Space Science Library. Vol. 140. Springer Science & Business Media. pp. 131–133.ISBN9789027726803.
- ^Mizon, R. (April 2000). "'Your friendly local street light'".Journal of the British Astronomical Association.110(2): 62–63.Bibcode:2000JBAA..110R..62M.
- ^Dunham, D. W.; et al. (September 2002). "Asteroidal occultation results multiply helped by Hipparcos".Memorie della Società' Astronomica Italiana.73(3): 662.Bibcode:2002MmSAI..73..662D.
- ^"Radar-Detected Asteroids and Comets".NASA/JPL Asteroid Radar Research.Retrieved30 October2011.
- ^Schober, H. J.; et al. (April 1979), "Photoelectric photometry and rotation periods of three large and dark asteroids – 49 Pales, 88 Thisbe and 92 Undina",Astronomy and Astrophysics Supplement Series,vol. 36, pp. 1–8,Bibcode:1979A&AS...36....1S.
External links
[edit]- 49 PalesatAstDyS-2, Asteroids—Dynamic Site
- 49 Palesat theJPL Small-Body Database