1168 Brandia

1168 Brandia, provisional designation 1930 QA, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered by astronomer Eugène Delporte at Uccle Observatory in 1930, the asteroid was later named after mathematician Eugène Brand.[2]

1168 Brandia
Discovery [1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date25 August 1930
Designations
(1168) Brandia
Named after
Eugène Brand [2]
(Belgian mathematician)
1930 QA
main-belt · (middle)
Eunomia [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc82.70 yr (30,208 days)
Aphelion3.1088 AU
Perihelion1.9931 AU
2.5510 AU
Eccentricity0.2187
4.07 yr (1,488 days)
120.52°
0° 14m 30.84s / day
Inclination12.735°
218.65°
122.91°
Physical characteristics
Dimensions10.110±0.057 km[5][6]
10.58 km (derived)[3]
10.61±0.7 km[7]
11.444 h[8]
11.444 h[9]
0.1375 (derived)[3]
0.150±0.038[5]
0.1505±0.0383[6]
0.1526±0.021[7]
S [3]
B–V = 0.860 [1]
U–B = 0.470 [1]
12.30±0.23[10] · 12.53[1][7] · 12.65[3][6][9]

    Discovery

    Brandia was discovered on 25 August 1930, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. Six nights later, the asteroid was independently discovered by Soviet astronomer Grigory Neujmin at Simeiz Observatory on 31 August 1930. The Minor Planet Center, however, only recognizes the first discoverer.[2][11] The body's observation arc begins at Uccle, two nights after its official discovery observation.[11]

    Orbit and classification

    This asteroid is a member of the Eunomia family (502), a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[3][4][12]:23

    Brandia orbits the Sun in the central main-belt at a distance of 2.0–3.1 AU once every 4 years and 1 month (1,488 days). Its orbit has an eccentricity of 0.22 and an inclination of 13° with respect to the ecliptic.[1]

    Physical characteristics

    Brandia is an assumed S-type asteroid,[3] which corresponds to the overall spectral type of the Eunomia family.[12]:23

    Rotation period

    In September 1989, a rotational lightcurve of Brandia was obtained from photometric observations by American astronomer Richard Binzel at CTIO and McDonald Observatory. Lightcurve analysis gave a well-defined rotation period of hours with a relatively high brightness variation of 0.62 magnitude (U=3).[9]

    An identical period of 11.444 hours with an amplitude of 0.50 magnitude was measured with a Celestron 14-inch telescope by Frederick Pilcher and published in 1985 (U=2).[8]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Brandia measures 10.110 and 10.61 kilometers in diameter, and its surface has an albedo of 0.150 and 0.1526, respectively.[5][6][7]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1375 and a diameter of 10.58 kilometers based on an absolute magnitude of 12.65.[3]

    Naming

    This minor planet was named after Belgian mathematician Eugène Brand, professor at the University of Brussels in Belgium. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 109).[2]

    References
    1. "JPL Small-Body Database Browser: 1168 Brandia (1930 QA)" (2017-03-24 last obs.). Jet Propulsion Laboratory. Retrieved 6 September 2017.
    2. Schmadel, Lutz D. (2007). "(1168) Brandia". Dictionary of Minor Planet Names – (1168) Brandia. Springer Berlin Heidelberg. p. 98. doi:10.1007/978-3-540-29925-7_1169. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1168) Brandia". Asteroid Lightcurve Database (LCDB). Retrieved 6 September 2017.
    4. "Asteroid 1168 Brandia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 6 September 2017.
    6. 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.
    7. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    8. Pilcher, Frederick; Binzel, R. P.; Tholen, D. J. (March 1985). "Rotations of 1168 Brandia and 1219 Britta". The Minor Planet Bulletin. 12: 10. Bibcode:1985MPBu...12...10P. Retrieved 6 September 2017.
    9. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 6 September 2017.
    10. 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 6 September 2017.
    11. "1168 Brandia (1930 QA)". Minor Planet Center. Retrieved 6 September 2017.
    12. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.

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