378 Holmia
Main-belt asteroid
From Wikipedia, the free encyclopedia
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.
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A three-dimensional model of 378 Holmia based on its light curve | |
| Discovery[1] | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 6 December 1893 |
| Designations | |
| (378) Holmia | |
| Pronunciation | /ËhoÊ(l)miÉ/ |
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 arc | 131.53 yr (48040 d) |
| Aphelion | 3.1363 AU (469.18 Gm) |
| Perihelion | 2.4170 AU (361.58 Gm) |
| 2.7767 AU (415.39 Gm) | |
| Eccentricity | 0.1295 |
| 4.6269 yr (1690.0 d) | |
Average orbital speed | 17.88 km/s |
| 217.667° | |
| 0° 12m 46.8s / day | |
| Inclination | 7.0123° |
| 232.356° | |
| 156.671° | |
| Jupiter MOID | 2.3037 AU |
| TJupiter | 3.312 |
| Physical characteristics | |
| Dimensions | 27.831 km |
| 4.440 ± 0.009 h (0.18500 ± 0.00038 d)[4]:â260â | |
| 0.339[2] | |
| S-type[5]:â212â | |
| 9.81[2] | |
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, StockholmâHolmia. 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 distanceâits semi-major axisâof 2.78 astronomical units (AU),[2] placing it in the main asteroid belt.[4]:â260â 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]:â212â 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]:â260â Its lightcurve also indicates that it is irregular in shape, with flat features near its equator.[11]:â564â565â
