1736 Floirac

1736 Floirac
Discovery [1]
Discovered by G. Soulié
Discovery site Bordeaux Obs.
Discovery date 6 September 1967
Designations
MPC designation (1736) Floirac
Named after
 Floirac, Gironde
(location of observatory) [2]
1967 RA · 1927 RB
1927 SN · 1934 XC
1937 RP · 1952 DO1
1957 TC · 1957 US
1962 CN · A914 WD
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 89.65 yr (32,745 days)
Aphelion 2.6074 AU
Perihelion 1.8500 AU
2.2287 AU
Eccentricity 0.1699
3.33 yr (1,215 days)
331.80°
Inclination 4.5502°
159.80°
248.92°
Physical characteristics
Dimensions 8.617±0.075[4]
8.701±0.119 km[5]
8.729 km[6]
8.73 km (taken)[3]
9.50±0.30 km[7]
10.08±0.34 km[8]
6.775±0.001 h[lower-alpha 1][lower-alpha 2]
12.28±0.06 h[9]
0.252±0.020[8]
0.258±0.060[7]
0.2711[6]
0.2994±0.0420[5]
0.302±0.021[4]
S [3][10]
11.84±0.07 (R)[lower-alpha 1] · 12.20[8][7] · 12.24[5] · 12.33±0.086[3][6] · 12.4[1] · 12.44±0.33[10]

    1736 Floirac, provisional designation 1967 RA, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8.7 kilometer in diameter.

    It was discovered on 6 September 1967, by French astronomer Guy Soulié at Bordeaux Observatory in southwestern France, who named it after the French town of Floirac.[2][11]

    Classification and orbit

    Floirac is a member of the Flora family. It orbits the Sun at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,215 days). Its orbit has an eccentricity of 0.17 and an inclination of 5° with respect to the ecliptic.[1]

    First observed as A914 WD at Simeiz Observatory in 1914, the body's observation arc begins with its 1927-identification as 1927 RB at Heidelberg Observatory, approximately 40 years prior to its official discovery observation at Bordeaux.[11]

    Physical characteristics

    This asteroid has been characterized as a stony S-type asteroid by PanSTARRS' photometric survey.[10]

    Lightcurves

    In October 2007, a rotational lightcurve of Floirac was obtained from photometric observations by astronomer Petr Pravec and collaborating colleges. Lightcurve analysis gave a rotation period of 6.775 hours with a low brightness variation of 0.08 magnitude (U=3).[lower-alpha 1][lower-alpha 2] An alternative period solution of 12.28 hours (Δmag 0.25) was found by French amateur astronomer Laurent Bernasconi in June 2006 (U=2).[9]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Floirac measures between 8.617 and 10.08 kilometers in diameter and its surface has an albedo of 0.252 and 0.302.[4][5][7][8]

    The Collaborative Asteroid Lightcurve Link takes an albedo of 0.2711 and a diameter of 8.73 kilometers with an absolute magnitude of 12.4, based on Petr Pravec's revised WISE-data.[3][6]

    Naming

    This minor planet was named by the discoverer for Floirac, a French town in the Département Gironde, near Bordeaux, where the discovering observatory is located.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 2883).[12]

    Notes

    1. 1 2 3 Pravec (2007) web: rotation period 6.775±0.001 hours with a brightness amplitude of 0.08 mag. Quality Code is 3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1736) Floirac and Pravec, P.; Wolf, M.; Sarounova, L. (2007)
    2. 1 2 Lightcurve plot of 1736 Floirac by Higgins and Pravec, from Ondrejov data obtained by the NEO Photometric Program and collaborating projects

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1736 Floirac (1967 RA)" (2017-04-26 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1736) Floirac. Springer Berlin Heidelberg. p. 138. ISBN 978-3-540-00238-3. Retrieved 21 December 2016.
    3. 1 2 3 4 5 "LCDB Data for (1736) Floirac". Asteroid Lightcurve Database (LCDB). Retrieved 21 December 2016.
    4. 1 2 3 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. Bibcode:2014ApJ...791..121M. arXiv:1406.6645 Freely accessible. doi:10.1088/0004-637X/791/2/121. Retrieved 21 December 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407 Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 21 December 2016.
    6. 1 2 3 4 Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 21 December 2016.
    7. 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. Bibcode:2012ApJ...759L...8M. arXiv:1209.5794 Freely accessible. doi:10.1088/2041-8205/759/1/L8. Retrieved 21 December 2016.
    8. 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 21 December 2016.
    9. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1736) Floirac". Geneva Observatory. Retrieved 21 December 2016.
    10. 1 2 3 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762 Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 21 December 2016.
    11. 1 2 "1736 Floirac (1967 RA)". Minor Planet Center. Retrieved 21 December 2016.
    12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 December 2016.
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