11118 Modra

11118 Modra
Discovery [1]
Discovered by A. Galád
D. Kalmančok
Discovery site Modra Obs.
Discovery date 9 August 1996
Designations
MPC designation 11118 Modra
Named after
 Modra
(town and observatory)[2]
1996 PK · 1991 FL1
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 25.09 yr (9,163 days)   
Aphelion 2.5063 AU (374.9 Gm)
Perihelion 2.1219 AU (317.4 Gm)
2.3141 AU (346.2 Gm)
Eccentricity 0.083058
3.52 yr (1,285 days)
27.489°
0° 16m 48s / day
Inclination 3.0329°
7.4713°
204.49°
Physical characteristics
Dimensions 8.69±3.13 km[4]
3.74 km (calculated)[3]
27.12±0.02 h[5]
27.1481±0.0409 h[6]
0.054±0.105[4]
0.24 (assumed)[3]
S [3] · C[7]
14.3[1][3]
14.10[4]
14.211±0.005 (R)[6]
14.17±0.36[7]

    11118 Modra, provisional designation 1996 PK, is a Flora asteroid of uncertain composition from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered by Slovak astronomers Adrián Galád and Dušan Kalmančok at the Modra Observatory in Slovakia on 9 August 1996.[8]

    It is a member of the Flora family, one of the largest orbital groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.1–2.5 AU once every 3 years and 6 months (1,286 days). Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic.[1]

    In 2010, a photometric light-curve analysis by American astronomer Brian Warner at his U.S. Palmer Divide Observatory in Colorado, rendered an unambiguous period of 27.12±0.02 hours with a brightness variation of 0.53 in magnitude (U=3).[5] An additional light-curve from the wide-field survey at the U.S. Palomar Transient Factory in 2011, gave a period of 27.1481±0.0409 hours with an amplitude of 0.42 (U=2).[6]

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has a low albedo of 0.05.[4] In agreement, the large-scale survey by Pan-STARRS (PS1) rates it as a dark carbonaceous body.[7] However, the Collaborative Asteroid Lightcurve Link (CALL) assumes a much higher albedo of 0.24, derived from the Flora family's largest member and namesake, the stony asteroid 8 Flora, and groups it to the S-type asteroid.[3] The different albedos of the two spectral classes also translate into divergent estimates for the body's diameter. While CALL calculates 3.7 kilometers, NASA's space-based survey measures the asteroid's size to be much larger, about 8.7 kilometer.[3][4]

    The minor planet was named after both the small historical town of Modra, located in the Bratislava Region of Slovakia, and the Modra Observatory of the Institute of Astronomy at Comenius University, where this asteroid had been discovered.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 11118 Modra (1996 PK)" (2016-04-17 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (11118) Modra. Springer Berlin Heidelberg. p. 753. ISBN 978-3-540-00238-3. Retrieved January 2016.
    3. 1 2 3 4 5 6 7 "LCDB Data for (11118) Modra". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. 1 2 3 4 5 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 January 2016.
    5. 1 2 Warner, Brian D. (April 2011). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 September-December". The Minor Planet Bulletin 38 (2): 82–86. Bibcode:2011MPBu...38...82W. ISSN 1052-8091. Retrieved January 2016.
    6. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved April 2016.
    7. 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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved April 2016.
    8. ↑ "11118 Modra (1996 PK)". Minor Planet Center. Retrieved January 2016.

    External links


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