48 Doris

48 Doris
VLT-SPHERE image of Doris
Discovery
Discovered byHermann Mayer Salomon Goldschmidt
Discovery date19 September 1857
Designations
Pronunciation/ˈdɔːrɪs/
Named after
Doris
1857 SA, 1948 FE
Main belt
AdjectivesDorian /ˈdɔːriən/
Orbital characteristics
Epoch 31 December 2006 (JD 2454100.5)
Aphelion500.093 million km (3.343 AU)
Perihelion430.463 million km (2.877 AU)
465.278 million km (3.110 AU)
Eccentricity0.075
2003.453 d (5.49 a)
336.191°
Inclination6.554°
183.754°
257.583°
Physical characteristics
Dimensions(257 × 211 × 185) ± 3 km
215±3 km
Mass(7.15±0.34)×1018 kg (2025)
(6.71±0.85)×1018 kg (2023)
Mean density
1.37±0.09 g/cm3 (2025)
1.29±0.17 g/cm3 (2023)
11.890105±0.000001 h
45°
294° ± 2°
51° ± 2°
0.066
0.065 ± 0.008
0.062
C
6.90
7.10

48 Doris is one of the largest main belt asteroids. It was discovered on 19 September 1857 by Hermann Goldschmidt from his balcony in Paris.

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 Beaumont suggested naming the two "The Twins".

Physical characteristics

An occultation on 19 March 1981 suggested a diameter of 219±25 km. Observations of an occultation on 14 October 1999, using four well-placed chords, indicate an ellipsoid of 278×142 km and that 48 Doris is an extremely irregularly shaped object.

Doris will pass within 0.019 AU of Pallas in June 2132.

Notes

  1. ↑ Calculated from its standard gravitational parameter GM = 0.477±0.023 km3/s2.

References

  1. ↑ "Doris". Merriam-Webster.com Dictionary. Merriam-Webster. OCLC 1032680871.
  2. ↑ "Dorian". Oxford English Dictionary (online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. 1 2 3 4 "JPL Small-Body Database Browser: 48 Doris" (2008-06-13 last obs). Retrieved 10 November 2008.
  4. 1 2 3 4 5 6 7 8 Vernazza, P.; Ferrais, M.; Jorda, L.; Hanuš, J.; Carry, B.; Marsset, M.; et al. (October 2021). "VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis". Astronomy & Astrophysics. 654: A56. Bibcode:2021A&A...654A..56V. doi:10.1051/0004-6361/202141781. hdl:10261/263281. S2CID 239104699. A56.
  5. 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
  6. 1 2 Li 李, Fan 凡; Yuan 袁, Ye 烨; Fu 傅, Yanning 燕宁; Chen 陈, Jian 健 (1 September 2023). "Dynamical Masses of 20 Asteroids Determined with Gaia DR3 Asteroid Observations". The Astronomical Journal. 166 (3): 93. Bibcode:2023AJ....166...93L. doi:10.3847/1538-3881/ace52b. ISSN 0004-6256. S2CID 260534542.
  7. ↑ Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
  8. ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 20. ISBN 978-3-540-00238-3.
  9. ↑ Ludek Vasta; Jan Manek (26 July 2005). "Observed Minor Planet Occultation Events". Asteroidal Occultations (Czech Astronomical Society). Retrieved 7 December 2008.
  10. ↑ "Occultation of HIP 29126 by (48) Doris - 2001 November 28". Royal Astronomical Society of New Zealand. Archived from the original on 19 February 2012. Retrieved 30 November 2008.
  11. ↑ "JPL Close-Approach Data: 48 Doris" (2009-08-11 last obs). Retrieved 23 February 2010.