148 Gallia
Main-belt asteroid
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148 Gallia is an asteroid from the central regions of the asteroid belt, approximately 90 kilometers (56 miles) in diameter. It was discovered on 7 August 1875, by the French brothers Paul Henry and Prosper Henry at the Paris, but the credit for this discovery was given to Prosper.[1] It was named after the Latin name for the country of France, Gaul.[3] Based upon its spectrum, it is an unusual G-type asteroid (GU) and a stony S-type asteroid in the Tholen and SMASS classification, respectively.[4][18]
Lightcurve-base 3D-model of 148 Gallia. | |
| Discovery[1] | |
|---|---|
| Discovered by | P. M. Henry |
| Discovery site | Paris |
| Discovery date | 7 August 1875 |
| Designations | |
| (148) Gallia | |
| Pronunciation | /ˈɡæliə/[2] |
Named after | Gaul[3] (Latin name for France) |
| A875 PA | |
| main-belt[1][4] · (middle) Gallia[5] | |
| Orbital characteristics[4] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 138.37 yr (50,540 d) |
| Aphelion | 3.2885 AU |
| Perihelion | 2.2531 AU |
| 2.7708 AU | |
| Eccentricity | 0.1868 |
| 4.61 yr (1,685 d) | |
| 278.58° | |
| 0° 12m 49.32s / day | |
| Inclination | 25.291° |
| 145.01° | |
| 252.79° | |
| Physical characteristics | |
| 80.87±1.04 km[6] 83.45±5.07 km[7] 85.91±23.39 km[8] 97.75±3.7 km[9] 98.09 km (derived)[10] | |
| Mass | (4.89±1.67)×1018 kg[7] |
Mean density | 16.06±6.22 g/cm3[7] |
| 20.6592±0.0007 h[11] 20.66±0.01 h[11] 20.664 h[12] 20.665266 h[a] 20.666±0.002 h[13][b] | |
| 0.1640±0.013[9] 0.2013 (derived)[10] 0.21±0.12[8] 0.240±0.008[6] | |
| Tholen = GU[4] SMASS = S[4][10] B–V = 0.858[4] U–B = 0.423[4] | |
| 6.97±0.84[14] 7.4[10] 7.4±0.1[15][16] 7.63[4][6][9] 7.67[8] 7.72±0.10[17] | |
Photometric observations of this asteroid at the European Southern Observatory in 1977–78 gave a light curve with a period of 0.86098 ± 0.00030 days (20.6635 ± 0.0072 h) and a brightness variation of 0.32 in magnitude.[12] A 2007 study at the Palmer Divide Observatory in Colorado, United States, yielded a period of 20.666 ± 0.002 hours with a magnitude variation of 0.21.[13][b]
This object is the namesake of the Gallia family (802), a small family of nearly 200 known stony asteroids that share similar spectral properties and orbital elements.[19] Hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.[20]
Notes
- Lightcurve plot of 148 Gallia, Palmer Divide Observatory, B. D. Warner (2007): rotation period 20.666±0.002 hours with a brightness amplitude of 0.21±0.02 mag. Quality code of 2+. Summary figures at the LCDB
