.png) A three-dimensional model of 376 Geometria based on its light curve | |
| Discovery[1] | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery site | Nice Observatory |
| Discovery date | 18 September 1893 |
| Designations | |
| (376) Geometria | |
| Pronunciation | /ˌdʒiːəˈmɛtriə,dʒiə-/ |
Named after | geometry |
| A893 SC · 1950 BQ1 · 1954 BJ[2][a] | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 126.70 yr (46278 d) |
| Aphelion | 2.68253 AU (401.301 Gm) |
| Perihelion | 1.89377 AU (283.304 Gm) |
| 2.28815 AU (342.302 Gm) | |
| Eccentricity | 0.172358 |
| 3.46126yr (1264.23d) | |
| 151.513° | |
| 0° 17m 5.132s / day | |
| Inclination | 5.43065° |
| 301.948° | |
| 316.527° | |
| Jupiter MOID | 2.3929 AU (357.97 Gm) |
| TJupiter | 3.575 |
| Physical characteristics | |
| 35.465 km[2] | |
| 7.7274600 ± 9.6×10−6 h (0.3219775 ± 0.0000004 d)[4]: 333 | |
| 57±5° or240±5°[4]: 333 | |
| −22±5° or−35±5°[4]: 333 | |
| 0.321[2] | |
| S (Tholen) SI (SMASSII)[2] | |
| 9.49 | |
376 Geometria is anasteroid located within themain asteroid belt that was discovered by French astronomerAuguste Charlois on 18 September 1893 inNice, France. It is classified as anS-type asteroid.[5] It is about 35.5 kilometres (22.1 mi) in size and has arotation period of 7.73 hours.
Geometria was discovered by astronomerAuguste Charlois on 18 September 1893 atNice Observatory.[1] Upon its discovery, it was given the old-styleprovisional designation1893 AM, and by the next year it was assigned the permanent number (376).[3]: 241 On 23 August 1901,[6] it was namedGeometria after the Latin wordgeometria, referring to the field ofgeometry.[7]: 44 Its name was announced byJohann Bauschinger alongside those of 33 other minor planets on the journalAstronomische Nachrichten, with the names having been selected by theAstronomical Calculation Institute.[7]: 43
In 1925, the old-style minor planet provisional designation scheme was replaced by the system currently in use. TheMinor Planet Center (MPC) has since retroactively replaced old-style designations with new-style designations.[8] Thus, Geometria's provisional designation given upon its discovery was replaced byA893 SC.[2]
Geometria orbits the Sun at an average distance—itssemi-major axis—of 2.29astronomical units (AU), taking 3.46 years to complete one revolution. Along its orbit, its distance from the Sun varies between 1.89 AU atperihelion to 2.68 AU ataphelion due to itsorbital eccentricity of 0.17. Its orbit isinclined by 5.43° with respect to theecliptic plane.[2]
Geometria has an estimated diameter of 35.5 kilometres (22.1 mi),[2] with a roughly spherical shape.[4]: 335 It is classified as anS-type asteroid in theTholen classification scheme and anSI-type asteroid in theSmall Main-belt Asteroid Spectroscopic Survey, Phase II (SMASSII) classification scheme. It has ageometric albedo of 0.321.[2]
Observations of Geometria'slightcurve, or variations in its observed brightness, show that it has arotation period of 7.73 hours, accurately measured to within 0.035 seconds. It has aretrograde rotation, rotating backwards relative to its orbital direction with its rotational pole pointed towards theecliptic south.[4]: 333 Determinations of Geometria's rotation period remained relatively consistent in the past, with 1983 observations from theObservatoire de Haute-Provence yielding a period of7.74±0.02 hours and observations taken in November 1994 yielding a period of 7.734 hours.[5][4]: 332–333 However, past attempts at determining Geometria's spin orientation were ambiguous.[4]: 335
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