187 Lamberta

187 Lamberta is a main-belt asteroid that was discovered by Corsican-born French astronomer Jérôme Eugène Coggia on April 11, 1878, and named after the astronomer Johann Heinrich Lambert. It was the second of Coggia's five asteroid discoveries.

187 Lamberta

Discovery
Discovered by	J. Coggia, 1878
Discovery date	11 April 1878
Designations
MPC designation	(187) Lamberta
Pronunciation	/læmˈbɜːrtə/
Alternative designations	A878 GB; 1946 LB; 1948 XR
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	113.41 yr (41424 d)
Aphelion	3.3856 AU (506.48 Gm)
Perihelion	2.0695 AU (309.59 Gm)
Semi-major axis	2.7276 AU (408.04 Gm)
Eccentricity	0.24126
Orbital period (sidereal)	4.50 yr (1645.3 d)
Mean anomaly	217.42°
Mean motion	0° 13m 7.68s / day
Inclination	10.588°
Longitude of ascending node	21.707°
Argument of perihelion	196.93°
Earth MOID	1.07102 AU (160.222 Gm)
Jupiter MOID	1.60105 AU (239.514 Gm)
TJupiter	3.289
Physical characteristics
Mean diameter	141±2 km[2] 147.294±1.389 km[1] 131.3±1.1 km[3]
Flattening	0.14[a]
Mass	(1.9±0.3)×1018 kg[2] (1.80±0.85)×1018 kg[3]
Mean density	1.28±0.22 g/cm3[2] 1.51±0.71 g/cm3[3]
Synodic rotation period	10.67 h (0.445 d)[1]
Geometric albedo	0.052 (calculated)[2] 0.044±0.007[1] 0.0647 ± 0.0135[4]
Spectral type	C[4] (Tholen)
Absolute magnitude (H)	8.40,[1] 7.980[4]

The spectrum matches a classification of a C-type asteroid, which may mean it has a composition of primitive carbonaceous materials. It is a dark object as indicated by the low albedo and has an estimated size of about 131 km.^[3]

Notes

1. Flattening derived from the maximum aspect ratio (c/a): ${\displaystyle f=1-{\frac {c}{a}}}$, where (c/a) = 0.86±0.07.^[2]