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48 Doris

Discovery
Discovered by	Hermann Mayer Salomon Goldschmidt
Discovery date	19 September 1857
Designations
MPC designation	(48) Doris
Pronunciation	/ˈdɔːrɪs/
Named after	Doris
Minor planet category	Main belt
Adjectives	Dorian /ˈdɔːriən/
Orbital characteristics
Epoch 31 December 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 (sidereal)	2003.453 d (5.49 a)
Mean anomaly	336.191°
Inclination	6.554°
Longitude of ascending node	183.754°
Argument of perihelion	257.583°
Physical characteristics
Dimensions	278 km × 142 km
Mean diameter	215±3 km 221.8±7.5 km (IRAS)
Flattening	0.28
Mass	(6.9±2.9)×10 kg (12.3±6.0)×10 kg
Mean density	1.32±0.55 g/cm 2.12±1.07 g/cm
Synodic rotation period	11.89 h
Geometric albedo	0.066 0.062
Spectral type	C
Absolute magnitude (H)	7.14

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 Deaumont 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.

In popular culture

48 Doris is a location in the text-based science fiction game Federation 2.

Notes

1. Flattening derived from the maximum aspect ratio (c/a): ${\displaystyle f=1-{\frac {c}{a}}}$, where (c/a) = 0.72±0.01.
2. (6.1 ± 3.0) × 10 M_☉

References

1. "Doris". Merriam-Webster.com Dictionary. Merriam-Webster.
2. "Dorian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
3. ^ "JPL Small-Body Database Browser: 48 Doris" (2008-06-13 last obs). Retrieved 10 November 2008.
4. ^ "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.
5. ^ P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
6. ^ Masses and densities of minor planets Archived 2011-06-04 at the Wayback Machine - Yu. Chernetenko, O. Kochetova, and V. Shor
   Kochetova (2004)
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. "JPL Close-Approach Data: 48 Doris" (2009-08-11 last obs). Retrieved 23 February 2010.

External links

• 48 Doris at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 48 Doris at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Hermann Goldschmidt
• Named minor planets
• CG-type asteroids (Tholen)
• Ch-type asteroids (SMASS)
• Astronomical objects discovered in 1857
• Objects observed by stellar occultation