445 Edna

445 Edna
Lightcurve-base 3D-model of 445 Edna.
Discovery
Discovered byE. F. Coddington
Discovery date2 October 1899
Designations
Pronunciation/ˈɛdnə/
1899 EX
Main belt
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.53 yr (42563 d)
Aphelion3.82552 AU (572.290 Gm)
Perihelion2.57569 AU (385.318 Gm)
3.20060 AU (478.803 Gm)
Eccentricity0.19525
5.73 yr (2091.4 d)
190.102°
0° 10m 19.668s / day
Inclination21.2944°
292.111°
81.2763°
Physical characteristics
Dimensions86.3 ± 8.28 km (composite estimate)
87.17±2.1 km
Mass(5.69±0.15)×1017 kg (2025)
(5.24±0.11)×1017 kg (2023)
3.78+0.17
−0.18×1017 kg (2022)
Mean density
1.60 g/cm3 (2025)
1.51±0.19 g/cm3 (2023)
1.12±0.33 g/cm3 (2022)
19.97 h (0.832 d)
0.0447±0.002
9.29

445 Edna is a large main belt asteroid.

It was discovered by E. F. Coddington on October 2, 1899, at Mount Hamilton, California. It was the astronomer's third and final asteroid discovery.

Notes

  1. ↑ Calculated from its standard gravitational parameter GM = 0.038±0.001 km3/s2.
  2. ↑ Calculated in kilograms from its value in solar masses: 1.903+0.085
    −0.090    ×10−13 M☉    .
  3. ↑ Assuming a diameter of 87.8 km.
  4. ↑ Assuming a diameter of 87.2 ± 3.7 km.
  5. ↑ Assuming a diameter of 86.3 ± 8.28 km.

References

  1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  2. 1 2 "445 Edna (1899 EX)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016.
  3. 1 2 3 Siltala, L.; Granvik, M. (February 2022). "Masses, bulk densities, and macroporosities of asteroids (15) Eunomia, (29) Amphitrite, (52) Europa, and (445) Edna based on Gaia astrometry". Astronomy & Astrophysics. 658: A65. arXiv:2111.06700. Bibcode:2022A&A...658A..65S. doi:10.1051/0004-6361/202141459. ISSN 0004-6361. S2CID 244102794.
  4. 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.
  5. 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.