4209 Briggs

4209 Briggs
Discovery [1]
Discovered by E. Helin
Discovery site Palomar Obs.
Discovery date 4 October 1986
Designations
MPC designation 4209 Briggs
Named after
 Geoffrey A. Briggs
(space physicist)[2][3]
1986 TG4 · 1969 SB
1978 EL8 · 1986 WD5
1989 CO4
main-belt · (outer) [4]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 46.52 yr (16,992 days)    
Aphelion 3.4214 AU
Perihelion 2.8871 AU
3.1543 AU
Eccentricity 0.0846
5.60 yr (2,046 days)
125.36°
0° 10m 33.24s / day
Inclination 21.624°
330.37°
12.530°
Physical characteristics
Dimensions 25.63±2.3 km (IRAS:2)[5]
28.92±0.71 km[6]
30.895±0.239 km[7]
29.62±0.61 km[8]
25.39 km (derived)[4]
12.235±0.01 h[9]
12.22±0.02 h[10]
12.2530±0.0005 h[11]
0.1288±0.026 (IRAS:2)[5]
0.103±0.006[6]
0.0889±0.0256[7]
0.067±0.013[8]
0.0827 (derived)[4]
C [4]
11.3[1][4]
10.8[5][6][7]
11.20[8]
11.57±0.42[12]

    4209 Briggs, provisional designation 1986 TG4, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 26 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin at the U.S. Palomar Observatory, California, on 4 October 1986.[13]

    The dark C-type asteroid orbits the Sun at a distance of 2.9–3.4 AU once every 5 years and 7 months (2,046 days). Its orbit has an eccentricity of 0.08 and an inclination of 22° with respect to the ecliptic.[1] The first precovery was obtained at El Leoncito in 1969, extending the asteroid's observation arc by 17 years prior to its discovery.[13]

    A rotational light-curves of this asteroid was obtained from photometric observations made by American astronomer Brian Warner at the Palmer Divide Observatory in September 2003. The revised light-curve showed a rotation period of 12.22±0.02 hours with a brightness variation of 0.45 in magnitude (U=3-).[10] A second light-curve from a collaboration of Czech, U.S. and Italian observatories published in November 2013, rendered a period of 12.2530±0.0005 hours (U=n/a).[11]

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its NEOWISE mission, the asteroid measures between 25.6 and 30.9 kilometers in diameter and its surface has an albedo in the range of 0.07 to 0.13.[5][6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.08 and a diameter of 25.4 kilometer, slightly below the result obtained by IRAS.[4]

    The minor planet was named after American space physicist, Geoffrey A. Briggs, director of the Solar System Exploration Division at NASA Headquarters during the 1980s. He was instrumental for the formation of the U.S.–Soviet Joint Working Group for Solar System Exploration and became its co-chairman. He was on the imaging teams for the Mariner, Viking and Voyager missions.[3] Briggs continued to promote Space related accomplishments to the public at the Air and Space Museum.[2] Naming citation was published on 27 June 1991 (M.P.C. 18456).[14]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 4209 Briggs (1986 TG4)" (2016-03-28 last obs.). Jet Propulsion Laboratory. Retrieved May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4209) Briggs. Springer Berlin Heidelberg. p. 360. ISBN 978-3-540-00238-3. Retrieved May 2016.
    3. 1 2 "Briggs, Geoffrey A". Encyclopedia Astronautica. Retrieved May 2016.
    4. 1 2 3 4 5 6 "LCDB Data for (4209) Briggs". Asteroid Lightcurve Database (LCDB). Retrieved May 2016.
    5. 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved May 2016.
    6. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved May 2016.
    7. 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". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved May 2016.
    8. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved May 2016.
    9. ↑ Warner, Brian D. (March 2004). "Rotation rates for asteroids 875, 926, 1679, 1796, 3915, 4209, and 34817". The Minor Planet Bulletin 31 (1): 19–22. Bibcode:2004MPBu...31...19W. ISSN 1052-8091. Retrieved May 2016.
    10. 1 2 Warner, Brian D. (April 2011). "Upon Further Review: VI. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin 38 (2): 96–101. Bibcode:2011MPBu...38...96W. ISSN 1052-8091. Retrieved May 2016.
    11. 1 2 Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics 559: 19. arXiv:1309.4296. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved May 2016.
    12. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved May 2016.
    13. 1 2 "4209 Briggs (1986 TG4)". Minor Planet Center. Retrieved May 2016.
    14. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved May 2016.

    External links


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