148 Gallia

148 Gallia

Orbital diagram
Discovery[1]
Discovered by	P. M. Henry
Discovery site	Paris
Discovery date	7 August 1875
Designations
MPC designation	(148) Gallia
Pronunciation	/ˈɡæliə/[5]
Named after	Gaul[2] (Latin name for France )
Alternative designations	A875 PA
Minor planet category	main-belt[1][3] · (middle) Gallia[4]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	138.37 yr (50,540 d)
|{{{apsis}}}|helion}}	3.2885 AU
|{{{apsis}}}|helion}}	2.2531 AU
Semi-major axis	2.7708 AU
Eccentricity	0.1868
Orbital period	4.61 yr (1,685 d)
Mean anomaly	278.58°
Mean motion	0° 12m 49.32s / day
Inclination	25.291°
Longitude of ascending node	145.01°
|{{{apsis}}}|helion}}	252.79°
Physical characteristics
Mean diameter	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]
Rotation period	20.6592±0.0007 h[11] 20.66±0.01 h[11] 20.664 h[12] 20.665266 h[lower-alpha 1] 20.666±0.002 h[13][lower-alpha 2]
Geometric albedo	0.1640±0.013[9] 0.2013 (derived)[10] 0.21±0.12[8] 0.240±0.008[6]
Spectral type	Tholen = GU[3] SMASS = S[3][10] B–V = 0.858[3] U–B = 0.423[3]
Absolute magnitude (H)	6.97±0.84[14] 7.4[10] 7.4±0.1[15][16] 7.63[3][6][9] 7.67[8] 7.72±0.10[17]

Gallia (minor planet designation: 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.^[2] 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.^[3][18]

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][lower-alpha 2]}

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

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info )
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 148 Gallia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 148 Gallia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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