378 Holmia

378 Holmia
A three-dimensional model of 378 Holmia based on its light curve
Discovery[1]
Discovered byAuguste Charlois
Discovery date6 December 1893
Designations
(378) Holmia
Pronunciation/ˈhoʊ(l)miə/
Named after
Stockholm
A893 XA · 1953 XS1 · 1960 FJ · 1962 TP · 1962 UC · 1979 KP1[2][a]
Main belt
Orbital characteristics[2]
Epoch 21 November 2025 (JD 2461000.5)
Uncertainty parameter 0
Observation arc131.53 yr (48040 d)
Aphelion3.1363 AU (469.18 Gm)
Perihelion2.4170 AU (361.58 Gm)
2.7767 AU (415.39 Gm)
Eccentricity0.1295
4.6269 yr (1690.0 d)
17.88 km/s
217.667°
0° 12m 46.8s / day
Inclination7.0123°
232.356°
156.671°
Jupiter MOID2.3037 AU
TJupiter3.312
Physical characteristics
Dimensions27.831 km
4.440 ± 0.009 h (0.18500 ± 0.00038 d)[4]: 260 
0.339[2]
S-type[5]: 212 
9.81[2]

378 Holmia is a stony asteroid located in the main asteroid belt.[6] It was discovered by Auguste Charlois on 6 December 1893, in Nice. Its name comes from the Holmia, the Latin name for Stockholm, the capital of Sweden. It is irregular in shape and 27.831 kilometres (17.293 mi) in diameter, rotating once every 4.44 hours.

Discovery and naming

Holmia was discovered by astronomer Auguste Charlois on 6 December 1893 at Nice Observatory.[1] It was given the provisional designation 1893 AP and assigned the number (378),[3] and its discovery was announced in the journal Astronomische Nachrichten on 13 December.[7] The asteroid is named after the Latin form of Sweden's capital, Stockholm—Holmia. This etymology is shared with element 67, holmium.[8][9]

In 1925, the old-style scheme for minor planet provisional designations was replaced by the scheme currently in use. The Minor Planet Center (MPC) has since retroactively applied the new-style scheme to pre-1925 designations. [10] Thus, Holmia's provisional designation given upon its discovery was changed to A893 XA.[2]

Orbit

Holmia orbits the Sun at an average distance—its semi-major axis—of 2.78 astronomical units (AU),[2] placing it in the main asteroid belt.[4]: 260  Along its 4.63 year long orbit, its distance from the Sun varies from 2.42 AU at perihelion to 3.14 AU at aphelion due to its orbital eccentricity of 0.13. Its orbit is inclined by 7.01° with respect to the ecliptic plane.[2]

Physical characteristics

Holmia has an estimated diameter of 27.831 kilometres (17.293 mi).[2] Under the Tholen classification scheme, it is categorized as an S-type asteroid,[5]: 212  and it has a geometric albedo of 0.339.[2] Analysis of its lightcurve, or variations in its observed brightness, suggests that it has a rotation period of 4.44 hours.[4]: 260  Its lightcurve also indicates that it is irregular in shape, with flat features near its equator.[11]: 564–565 

Notes

  1. ^ The MPC notates Holmia's retroactive new-style designation as 1893 XA.[1] Its old-style designation was 1893 AP.[3]

References

  1. ^ a b c "(378) Holmia = 1893 XA = 1953 XS1 = 1960 FJ = 1962 TP = 1962 UC = 1979 KP1". Minor Planet Center. Retrieved 5 November 2025.
  2. ^ a b c d e f g h i "378 Holmia (A893 XA)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 8 November 2025.
  3. ^ a b Berberich, A. (February 1894). "Elemente der Planeten (374), (375), (376) und (378)". Astronomische Nachrichten (in German). 134 (20): 335. Bibcode:1894AN....134..335B. doi:10.1002/asna.18941342003.
  4. ^ a b c Farfán, Rafael González; et al. (July 2024). "Analysis and Lightcurves of 22 Asteroids". The Minor Planet Bulletin. 51 (3): 259–263. Bibcode:2024MPBu...51..259F.
  5. ^ a b di Martino, M.; Dotto, E.; Barucci, M. A.; Fulchignoni, M.; Rotundi, A. (May 1994). "Photoelectric Photometry of Ten Small and Fast Spinning Asteroids". Icarus. 109 (1): 210–218. Bibcode:1994Icar..109..210D. doi:10.1006/icar.1994.1087.
  6. ^ Hirsch, R (2005). "Photometry and models of selected main belt asteroids". Astronomy and Astrophysics. 478 (2) (478 ed.): 329–335. Bibcode:2008A&A...478..559M. doi:10.1051/0004-6361:20078930.
  7. ^ Perrotin, Henri Joseph Anastase (December 1893). "Neuer Planet 1893 AP". Astronomische Nachrichten (in French). 134: 167. Bibcode:1893AN....134..167B.
  8. ^ Schmadel, Lutz D. (11 November 2013). Dictionary of Minor Planet Names. Vol. 2 (6 ed.). Springer Berlin, Heidelberg. p. 1452. doi:10.1007/978-3-642-29718-2. ISBN 978-3-642-29717-5.
  9. ^ "Holmium". Royal Society of Chemistry. Retrieved 8 November 2025.
  10. ^ "Provisional Designations". Minor Planets Center. Archived from the original on 11 July 2025. Retrieved 5 November 2025.
  11. ^ Marciniak, A.; et al. (February 2008). "Photometry and models of selected main belt asteroids V. 73 Klytia, 377 Campania, and 378 Holmia". Astronomy and Astrophysics. 478 (2): 559–565. Bibcode:2008A&A...478..559M. doi:10.1051/0004-6361:20078930.
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