- 48 Doris
-
48 Doris DiscoveryDiscovered by Hermann Mayer Salomon Goldschmidt Discovery date September 19, 1857 DesignationsAlternate name(s) Minor planet
categoryMain belt Adjective Dorian Epoch December 31, 2006 (JD 2454100.5) Aphelion 500.093 Gm (3.343 AU) Perihelion 430.463 Gm (2.877 AU) Semi-major axis 465.278 Gm (3.110 AU) Eccentricity 0.075 Orbital period 2003.453 d (5.49 a) Average orbital speed 16.87 km/s Mean anomaly 336.191° Inclination 6.554° Longitude of ascending node 183.754° Argument of perihelion 257.583° Physical characteristicsDimensions 278×142km[2]
221.8 km (IRAS)[1]Mass 1.7×1019 kg[3][4]
(assumed)[5]Mean density 2.1 to 3.1 g/cm³ Equatorial surface gravity 0.0620 m/s² Escape velocity 0.1173 km/s Rotation period 11.89 h[1] Albedo 0.062[1][6] Temperature ~158 K Spectral type C[1] Absolute magnitude (H) 6.90[1] 48 Doris (
/ˈdɔrɨs/; Greek Δωρις) is one of the largest main belt asteroids. It was discovered by Hermann Goldschmidt on September 19, 1857 from his balcony in Paris.Contents
Name
To find a name for the object, Jacques Babinet of the Academy of Sciences created a shortlist and asked the geologist Élie de Beaumont to make the selection. De Beaumont chose Doris, after an Oceanid in Greek mythology. Since Doris was discovered on the same night as 49 Pales, de Deaumont suggested naming the two "The Twins".[7]
Physical characteristics
An occultation on March 19, 1981, suggested a diameter of 219±25 km.[8] Observations of an occultation on October 14, 1999, using four well-placed chords, indicate an ellipsoid of 278×142 km and that 48 Doris is an extremely irregular shaped object.[2]
Conjunction
Doris will pass within 0.019 AU of Pallas in June 2132.[9]
In popular culture
48 Doris is a location in the text-based science fiction game Federation 2.
References
- ^ a b c d e f "JPL Small-Body Database Browser: 48 Doris". 2008-06-13 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48. Retrieved 2008-11-10.
- ^ a b "Occultation of HIP 29126 by (48) Doris - 2001 November 28". Royal Astronomical Society of New Zealand. http://occsec.wellington.net.nz/planet/2001/plnres01.htm#Doris. Retrieved 2008-11-30.
- ^ Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics 374: 703–711. Bibcode 2001A&A...374..703M. doi:10.1051/0004-6361:20010731. http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/29/aa10228/aa10228.html. Retrieved 2008-11-10.
- ^ (Mass estimate of Doris 0.09 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.786E+19
- ^ Michalak2001 assumed masses of perturbing asteroids used in calculations of perturbations of the test asteroids.
- ^ Asteroid Data Sets
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.19.
- ^ Ludek Vasta, Jan Manek (2005-07-26). "Observed Minor Planet Occultation Events". Asteroidal Occultations (Czech Astronomical Society). http://mpocc.astro.cz/world/mpocc1.txt. Retrieved 2008-12-07.
- ^ "JPL Close-Approach Data: 48 Doris". 2009-08-11 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48;cad=1#cad. Retrieved 2010-02-23.
External links
- Orbital simulation from JPL (Java) / Ephemeris
Minor planets navigator Small Solar System bodies Minor planets - Designation
- Groups
- Moons
- Meanings of names
- Pronunciation of names
Comets Meteoroids Lists / categories - Asteroid groups and families
- Asteroid moons
- Binary asteroids
- Minor planets
Categories:- Main Belt asteroids
- Asteroids named from Greek mythology
- C-type asteroids
- Astronomical objects discovered in 1857
- C-type Main Belt asteroid stubs
Wikimedia Foundation. 2010.
