673 Edda

673 Edda
Modelled shape of Edda from its lightcurve
Discovery
Discovered byJoel Hastings Metcalf
Discovery siteTaunton, Massachusetts
Discovery date20 September 1908
Designations
(673) Edda
Pronunciation/ˈɛdə/[1]
1908 EA
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc107.57 yr (39290 d)
Aphelion2.8471 AU (425.92 Gm)
Perihelion2.7821 AU (416.20 Gm)
2.8146 AU (421.06 Gm)
Eccentricity0.011542
4.72 yr (1,724.7 d) 4.72 yr (1724.7 d)
199.04°
0° 12m 31.428s / day
Inclination2.8770°
226.723°
236.303°
Physical characteristics
18.765±0.5 km
22.340 h (0.9308 d)
0.1044±0.006
10.20

673 Edda is a minor planet orbiting the Sun. It was discovered 20 September 1908 by the American astronomer Joel Hastings Metcalf, and was named for the Norse Edda literary works. The name may also have been inspired by the asteroid's provisional designation 1908 EA.[3] This asteroid is orbiting at a distance of 2.81 AU with a period of 4.72 yr and an eccentricity of 0.012.[2] The orbit is close to a 5:2 mean motion resonance with Jupiter, which is located at 2.824 AU.[4]

The long rotation period and low brightness amplitude of this asteroid make it more challenging for measurement of the rotation period. An extensive photometry campaign in 2015 provided a period of 22.340±0.004 h. The unusual light curve suggests that the asteroid shape is very asymmetric.[5] It is a stony S-type asteroid with a mean diameter of 38+6
−2 km.[6]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b "673 Edda (1908 EA)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
  3. ^ Schmadel, Lutz D. (2013), Dictionary of Minor Planet Names, Springer Berlin Heidelberg, p. 105, ISBN 9783662028049.
  4. ^ Hahn, G.; et al. (June 1991), "Orbital evolution studies of asteroids near the 5:2 mean motion resonance with Jupiter", Astronomy and Astrophysics, 246 (2): 603–618, Bibcode:1991A&A...246..603H.
  5. ^ Marciniak, Anna; et al. (June 2016), Różańska, Agata; Bejger, M. (eds.), "Difficult cases in photometric studies of asteroids", Proceedings of the Polish Astronomical Society, 3: 84–87, Bibcode:2016pas..conf...84M.
  6. ^ Marciniak, A.; et al. (May 2019), "Thermal properties of slowly rotating asteroids: results from a targeted survey", Astronomy & Astrophysics, 625: 40, arXiv:1905.06056, Bibcode:2019A&A...625A.139M, doi:10.1051/0004-6361/201935129, A139.


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