1158 Luda

1158 Luda, provisional designation 1929 QF, is a stony asteroid from the middle regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 31 August 1929, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula.[14] It was named after Ludmilla Neujmin, the sister of the discoverer.[2]

1158 Luda
Discovery [1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date31 August 1929
Designations
(1158) Luda
Named after
Ludmilla Neujmin
(discoverer's sister)[2]
1929 QF · 1954 UQ1
1958 TG1 · 1972 GC
main-belt · Maria [3] · Eunomia [4]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc87.27 yr (31,876 days)
Aphelion2.8532 AU
Perihelion2.2742 AU
2.5637 AU
Eccentricity0.1129
4.11 yr (1,499 days)
56.051°
0° 14m 24.36s / day
Inclination14.834°
344.74°
56.226°
Physical characteristics
Dimensions18.636±0.207 km[5]
18.70±0.48 km[6]
19.06±0.8 km (IRAS:8)[7]
20.596±0.130 km[8]
6.86±0.01 h[9]
6.863±0.005 h[10]
6.870±0.005 h[11]
6.90±0.01 h[12]
7.44 h[3]
0.2025±0.0548[8]
0.221±0.034[5]
0.2329±0.022 (IRAS:8)[7]
0.253±0.015[6]
S [4][13]
10.8[1][4][6][7][8] · 10.95±0.33[13]

    Orbit and classification

    Luda orbits the Sun at a distance of 2.3–2.9 AU once every 4 years and 1 month (1,499 days). Its orbit has an eccentricity of 0.11 and an inclination of 15° with respect to the ecliptic.[1] The body's observation arc begins with its first used observation at Johannesburg Observatory, one month after its official discovery observation at Simeiz.[14] Luda is a stony S-type asteroid.[13]

    Based on its orbital elements, Luda is a member of the Eunomia family, a large group of stony asteroids and the most prominent family in the intermediate main-belt, while Argentine astronomer Alvarez-Candal from the Universidad Nacional de Córdoba groups it into the smaller Maria family, which is named after 170 Maria (the same discrepancy exists for 9175 Graun and 2429 Schürer).[3]:389

    Physical characteristics

    Photometry

    Several rotational lightcurves of Luda were obtained from photometric observations. Analysis of the best-rated lightcurves obtained by French amateur astronomer Laurent Bernasconi, American astronomer Brian Warner, and an international group lead by Korean astronomers, gave a well-defined rotation period between 6.86 and 6.87 hours with a brightness variation between 0.13 and 0.22 magnitude (U=3/3-/3).[9][10][11] Photometric observations also gave a period of 6.9 and 7.44 hours, but these were derived from a fragmentary and ambiguous light curve, respectively.(U=1/2).[3][12]

    Diameter and albedo

    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 subsequent NEOWISE mission, Luda measures between 18.63 and 20.59 kilometers in diameter and its surface has an albedo between 0.20 and 0.25.[5][6][7][8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.232 and a diameter of 19.06 kilometers with an absolute magnitude of 10.8.[4]

    Naming

    This minor planet was named for Ludmilla Neujmin, the sister of the discoverer. "Luda" is a diminutive of Ludmilla.[2] Astronomer Lutz Schmadel, who compiled this naming citation, based it on a private communication with "N. S. Samojlova-Yakhontova", as neither the Minor Planet Circulars nor The Names of the Minor Planets give any information about this asteroid's name.[2][15]

    References
    1. "JPL Small-Body Database Browser: 1158 Luda (1929 QF)" (2017-01-07 last obs.). Jet Propulsion Laboratory. Retrieved 25 January 2017.
    2. Schmadel, Lutz D. (2007). "(1158) Luda". Dictionary of Minor Planet Names – (1158) Luda. Springer Berlin Heidelberg. p. 98. doi:10.1007/978-3-540-29925-7_1159. ISBN 978-3-540-00238-3.
    3. Alvarez-Candal, Alvaro; Duffard, René; Angeli, Cláudia A.; Lazzaro, Daniela; Fernández, Silvia (December 2004). "Rotational lightcurves of asteroids belonging to families". Icarus. 172 (2): 388–401. Bibcode:2004Icar..172..388A. doi:10.1016/j.icarus.2004.06.008. Retrieved 25 January 2017.
    4. "LCDB Data for (1158) Luda". Asteroid Lightcurve Database (LCDB). Retrieved 25 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. Retrieved 25 January 2017.
    6. 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 17 October 2019. (online, AcuA catalog p. 153)
    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. 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.
    9. Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; Brosch, N.; Kaplan, M.; et al. (March 2014). "Rotational Properties of the Maria Asteroid Family". The Astronomical Journal. 147 (3): 15. arXiv:1311.5318. Bibcode:2014AJ....147...56K. doi:10.1088/0004-6256/147/3/56. Retrieved 25 January 2017.CS1 maint: numeric names: authors list (link)
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1158) Luda". Geneva Observatory. Retrieved 25 January 2017.
    11. Warner, Brian D. (January 2011). "Upon Further Review: III. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 38 (1): 21–23. Bibcode:2011MPBu...38...21W. ISSN 1052-8091. Retrieved 25 January 2017.
    12. Warner, Brian D. (September 2005). "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005". The Minor Planet Bulletin. 32 (3): 54–58. Bibcode:2005MPBu...32...54W. ISSN 1052-8091. Retrieved 25 January 2017.
    13. 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 25 January 2017.
    14. "1158 Luda (1929 QF)". Minor Planet Center. Retrieved 25 January 2017.
    15. Schmadel, Lutz D. (1997). Dictionary of Minor Planet Names – Introduction, Source of Information. Springer Berlin Heidelberg. p. 16. ISBN 978-3-662-06617-1.
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