187 Lamberta

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187 Lamberta
Discovery
Discovered byJ. Coggia, 1878
Discovery date11 April 1878
Designations
Pronunciation/læmˈbɜːrtə/
A878 GB; 1946 LB;
1948 XR
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc113.41 yr (41424 d)
Aphelion3.3856 AU (506.48 Gm)
Perihelion2.0695 AU (309.59 Gm)
2.7276 AU (408.04 Gm)
Eccentricity0.24126
4.50 yr (1645.3 d)
217.42°
0° 13m 7.68s / day
Inclination10.588°
21.707°
196.93°
Earth MOID1.07102 AU (160.222 Gm)
Jupiter MOID1.60105 AU (239.514 Gm)
TJupiter3.289
Physical characteristics
141±2 km[2]
147.294±1.389 km[1]
131.3±1.1 km[3]
Flattening0.14[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]
10.67 h (0.445 d)[1]
0.052 (calculated)[2]
0.044±0.007[1]
0.0647 ± 0.0135[4]
C[4] (Tholen)
8.40,[1] 7.980[4]

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

This object is orbiting the Sun at a distance of 2.73 AU with a moderate eccentricity of 0.24 and an orbital period of 4.50 years. The orbital plane is inclined at an angle of 10.6° to the plane of the ecliptic. It is spinning with a rotation period of 10.67 hours.

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): f = 1 − c a {\displaystyle f=1-{\frac {c}{a}}} {\displaystyle f=1-{\frac {c}{a}}}, where (c/a) = 0.86±0.07.[2]

References

  1. "187 Lamberta". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
  2. P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  3. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
  4. Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, no. 1667, Bibcode:2012LPICo1667.6089P. See Table 4.