1412 Lagrula

1412 Lagrula, provisional designation 1937 BA, is an asteroid from the inner regions of the asteroid belt, approximately 7 or 23 kilometers in diameter, depending on the body's divergent reflectivity measurements.

1412 Lagrula
Discovery[1]
Discovered byL. Boyer
Discovery siteAlgiers Obs.
Discovery date19 January 1937
Designations
(1412) Lagrula
Named after
Philippe Lagrula (astronomer)[2]
1937 BA · 1929 US
1962 XM
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc86.64 yr (31,644 days)
Aphelion2.4645 AU
Perihelion1.9648 AU
2.2147 AU
Eccentricity0.1128
3.30 yr (1,204 days)
145.58°
0° 17m 56.4s / day
Inclination4.7178°
66.118°
14.052°
Physical characteristics
Dimensions7.78±1.36 km[4]
7.806±0.075 km[5]
9.068±0.047 km[6]
23±3 km[7]
23.98 km (calculated)[3]
5.882±0.001 h[8]
5.9176±0.0001 h[7]
0.058 (assumed)[3]
0.06[7]
0.2378±0.0284[6]
0.318±0.044[5]
0.36±0.14[4]
S[3][9]
11.81±0.04[3][7] · 12.3[1] · 12.4[6] · 12.62[4] · 12.73±0.75[9]

    It was discovered on 19 January 1937, by French astronomer Louis Boyer at the North African Algiers Observatory in Algeria.[10] It was later named after French astronomer Philippe Lagrula.[2]

    Classification and orbit

    Lagrula is a presumed member of the Flora family, a large group of stony S-type asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,204 days). Its orbit has an eccentricity of 0.11 and an inclination of 5° with respect to the ecliptic.[1] First identified as 1929 US at Lowell Observatory in 1929, the body's observation arc was extended by 8 years prior to its official discovery observation at Algiers.[10]

    Physical characteristics

    Photometry

    During March and April 2013, photometric observations of Lagrula were made over ten nights by Italian astronomer Giovanni Casalnuovo at Eurac Observatory (C62) in Bolzano, Italy. Lightcurve analysis gave a rotation period of 5.9176 hours and a brightness variation of 0.28 magnitude (U=2+).[7] In January 2016, a more refined period of 5.882 hours with an amplitude of 0.44 magnitude was obtained from a bimodal lightcurve by Spanish astronomer group OBAS, Observadores de Asteroides (U=3).[8]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lagrula measures 7.8 kilometers in diameter, and its surface has an albedo of 0.318 and 0.36, respectively (most recent results only).[4][5] However, the Collaborative Asteroid Lightcurve Link assumes a carbonaceous albedo of 0.058 and calculates a diameter of 23.98 kilometers,[3] which is in agreement with Giovanni Casalnuovo, who published a diameter of 23±3 and an albedo of 0.06 using an absolute magnitude of 11.81.[7] Casalnuovo assumed a C-type, rather than an S-type, because he found an average V–R color index of 0.37±0.05 magnitude.[7]

    Naming

    This minor planet was named after French astronomer Joanny-Philippe Lagrula (1870–1941), discoverer of the minor planet 775 Lumière and director of the Quito Astronomical Observatory and Algiers Observatory.[2] Naming citation was neither published in The Names of the Minor Planets nor in the Minor Planet Circulars, but researched and compiled by astronomer and author Lutz D. Schmadel, based on his private communications with his colleges (LDS).[11]

    References
    1. "JPL Small-Body Database Browser: 1412 Lagrula (1937 BA)" (2016-06-16 last obs.). Jet Propulsion Laboratory. Retrieved 9 January 2017.
    2. Schmadel, Lutz D. (2007). "(1412) Lagrula". Dictionary of Minor Planet Names – (1412) Lagrula. Springer Berlin Heidelberg. p. 114. doi:10.1007/978-3-540-29925-7_1413. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1412) Lagrula". Asteroid Lightcurve Database (LCDB). Retrieved 9 January 2017.
    4. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. S2CID 119289027. Retrieved 9 January 2017.
    5. 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. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID 119293330. Retrieved 9 January 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. S2CID 118700974.
    7. Casalnuovo, Giovanni Battista (October 2013). "Lightcurve Photometry, H-G Parameters and Estimated Diameter for 1412 Lagrula". The Minor Planet Bulletin. 40 (4): 188. Bibcode:2013MPBu...40..188C. ISSN 1052-8091. Retrieved 9 January 2017.
    8. Aznar Macias, Amadeo; Carreno Garcerain, Alfonso; Arce Masego, Enrique; Brines Rodriguez, Pedro; Lozano de Haro, Juan; Fornas Silva, Alvaro; et al. (July 2016). "Twenty-one Asteroid Lightcurves at Group Observadores de Asteroides (OBAS): Late 2015 to Early 2016". The Minor Planet Bulletin. 43 (3): 257–263. Bibcode:2016MPBu...43..257A. ISSN 1052-8091. Retrieved 9 January 2017.
    9. 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. S2CID 53493339. Retrieved 9 January 2017.
    10. "1412 Lagrula (1937 BA)". Minor Planet Center. Retrieved 9 January 2017.
    11. Schmadel, Lutz D. (1997). Dictionary of Minor Planet Names – Introduction, Source of Information. Springer Berlin Heidelberg. p. 16. ISBN 978-3-662-06617-1. Retrieved 9 January 2017.

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