6181 Bobweber

6181 Bobweber
Discovery [1]
Discovered by E. F. Helin
Discovery site Palomar Obs.
Discovery date 6 September 1986
Designations
MPC designation 6181 Bobweber
Named after
 Robert Weber
(astronomer)[2]
1986 RW · 1979 YU8
1990 WL2
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 62.38 yr (22,783 days)
Aphelion 3.0105 AU
Perihelion 1.8498 AU
2.4301 AU
Eccentricity 0.2388
3.79 yr (1,384 days)
286.54°
0° 15m 36.72s / day
Inclination 7.5695°
303.66°
93.624°
Physical characteristics
Dimensions 4.458±0.056 km[4]
4.488±0.046 km[5]
5.66 km (calculated)[3]
2.75796±0.00003 h[lower-alpha 1]
2.7576±0.0001 h[6]
0.20 (assumed)[3]
0.4210±0.0447[5]
0.425±0.038[4]
S [3]
13.3[5]
13.6[1][3]

    6181 Bobweber, provisional designation 1986 RW, is a stony asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 6 September 1986, by American female astronomer Eleanor Helin at the U.S. Palomar Observatory in California.[2]

    The S-type asteroid orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,384 days). Its orbit has an eccentricity of 0.24 and an inclination of 8° with respect to the ecliptic.[1] The first precovery was taken at the discovering observatory in 1954, extending the asteroid's observation arc by 32 years prior to its discovery observation.[2]

    A rotational light-curve for this asteroid was obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory in December 2009. It gave a well-defined rotation period of 2.75796±0.00003 hours with a brightness variation of 0.12 in magnitude (U=3).[lower-alpha 1] In January 2014, astronomer Julian Oey at the Australian Blue Mountains Observatory (Q68) obtained a nearly identical period of 2.7576±0.0001 hours with an amplitude of 0.15 magnitude (U=3-).[6]

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 4.5 kilometers in diameter and its surface has a high albedo of 0.42 and 0.43, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5.7 kilometers.[3]

    The minor planet was named in memory of Robert Weber (1926–2008), physicist and discoverer of minor planets at MIT Lincoln Laboratory, developer of the Deep Space Satellite Tracking Network. He also co-developed and was credited with the first discoveries made by the Lincoln Near-Earth Asteroid Research (LINEAR) at Lincoln Laboratory's Experimental Test Site at White Sands Missile Range in Socorro, New Mexico. Naming citation was published on 21 March 2008 (M.P.C. 62353).[2][7]

    References

    1. 1 2 Pravec (2009) web: rotation period 2.75796±0.00003 hours with a brightness amplitude of 0.12 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (6181) Bobweber and Pravec, P.; Wolf, M.; Sarounova, L. (2009)
    1. 1 2 3 4 "JPL Small-Body Database Browser: 6181 Bobweber (1986 RW)" (2016-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 26 September 2016.
    2. 1 2 3 4 "6181 Bobweber (1986 RW)". Minor Planet Center. Retrieved 26 September 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (6181) Bobweber". Asteroid Lightcurve Database (LCDB). Retrieved 26 September 2016.
    4. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 8 September 2016.
    5. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 September 2016.
    6. 1 2 Oey, Julian (January 2016). "Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2014". The Minor Planet Bulletin. 43 (1): 45–51. Bibcode:2016MPBu...43...45O. ISSN 1052-8091. Retrieved 26 September 2016.
    7. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 September 2016.

    External links

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