1943 Anteros

1943 Anteros /ˈæntərɒs/, provisional designation 1973 EC, is a spheroidal, rare-type asteroid and near-Earth object of the Amor group, approximately 2 kilometers in diameter.

1943 Anteros
Discovery[1]
Discovered byJ. B. Gibson
Discovery siteEl Leoncito Complex
Discovery date13 March 1973
Designations
(1943) Anteros
Pronunciation/ˈæntərɒs/[2]
Named after
Anteros (Greek mythology)[3]
1973 EC
Amor · NEO[1][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc44.02 yr (16,080 days)
Aphelion1.7968 AU
Perihelion1.0642 AU
1.4305 AU
Eccentricity0.2561
1.71 yr (625 days)
332.17°
Inclination8.7061°
246.33°
338.37°
Earth MOID0.0630 AU · 24.5 LD
Physical characteristics
Dimensions2.01 km (derived)[5]
2.38±0.72 km[6]
2.39 km[7]
2.43 km[8]
2.735±0.003 h[9]
2.867±0.001 h[10]
2.8695 h[11]
2.9±0.1 h[12]
3 h[13]
6.5209±0.0022 h[14]
0.138±0.107[6]
0.15[8]
0.17[15]
0.18 (assumed)[5]
S (Tholen)[1] · L (SMASS)[1]
Sq[16] · S[17][18] · L[5]
B–V = 0.841[1]
U–B = 0.444[1]
15.00[18] · 15.449±0.002 (R)[14] · 15.75[1] · 15.8[8] · 15.82±0.14[19] · 15.89±0.14[20] · 15.9±0.2[6] · 15.96[11] · 16.01[21] · 16.35±0.48[17]

    It was discovered on 13 March 1973, by American astronomer James Gibson at the Leoncito Astronomical Complex in Argentina, and named for the Greek god Anteros.[3][4]

    Orbit and classification

    Anteros is an Amor asteroid, which approach the orbit of Earth from beyond but do not cross it. It orbits the Sun at a distance of 1.1–1.8 AU once every 1 year and 9 months (625 days). Its orbit has an eccentricity of 0.26 and an inclination of 9° with respect to the ecliptic.[1]

    The near-Earth object has an Earth minimum orbit intersection distance of 0.0630 AU (9,420,000 km) or 24.5 lunar distances, which is slightly above the defined limit of 0.05 AU for potentially hazardous objects.[1]

    The body's observation arc begins 3 days prior to its official discovery observation in 1973, as a 1968-precovery from Palomar remained unused.[4]

    Physical characteristics

    In the Tholen classification, Anteros is a common S-type asteroid, while in the SMASS taxonomy, it is a relatively rare L-type asteroid, described as a reddish but otherwise featureless stony asteroid.[1] It has also been characterized as a Sq subtype, which transitions to the Q-type asteroids.[16]

    Rotation period

    Several rotational lightcurves of Anteros were obtained from photometric observations by Brian Warner, Petr Pravec, the Palomar Transient Factory and others since the 1980s.[5] One of the best-rated and most recent lightcurves was obtained at the Palmer Divide Station (716) in December 2013, and gave a rotation period of 2.867 hours with a brightness variation of 0.1 magnitude, which indicates that Anteros has a nearly spheroidal shape (U=3).[10]

    Diameter and albedo

    According to the EXPLORENEOs survey carried out by the Spitzer Space Telescope, Anteros measures between 2.38 and 2.43 kilometers in diameter, and its surface has an albedo of 0.138 to 0.170.[6][7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.0 kilometers with an absolute magnitude of 15.89.[5]

    Naming

    This minor planet was named after the Greek god Anteros, avenger of unrequited love and punisher of those who scorn love and the advances of others. The asteroid's name may have been chosen because its orbit is similar to the asteroid 433 Eros, and in Greek mythology, Anteros was said to be the twin brother of Eros.[3] The official naming citation was published by the Minor Planet Center on 15 October 1977 (M.P.C. 4237).[22]

    References
    1. "JPL Small-Body Database Browser: 1943 Anteros (1973 EC)" (2017-03-19 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2017.
    2. "Anteros". Dictionary.com Unabridged (Online). n.d.
    3. Schmadel, Lutz D. (2007). "(1943) Anteros". Dictionary of Minor Planet Names – (1943) Anteros. Springer Berlin Heidelberg. p. 156. doi:10.1007/978-3-540-29925-7_1944. ISBN 978-3-540-00238-3.
    4. "1943 Anteros (1973 EC)". Minor Planet Center. Retrieved 9 December 2016.
    5. "LCDB Data for (1943) Anteros". Asteroid Lightcurve Database (LCDB). Retrieved 9 December 2016.
    6. Mueller, Michael; Delbo', M.; Hora, J. L.; Trilling, D. E.; Bhattacharya, B.; Bottke, W. F.; et al. (April 2011). "ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids" (PDF). The Astronomical Journal. 141 (4): 9. Bibcode:2011AJ....141..109M. doi:10.1088/0004-6256/141/4/109. S2CID 44827674.
    7. Harris, A. W.; Mommert, M.; Hora, J. L.; Mueller, M.; Trilling, D. E.; Bhattacharya, B.; et al. (March 2011). "ExploreNEOs. II. The Accuracy of the Warm Spitzer Near-Earth Object Survey" (PDF). The Astronomical Journal. 141 (3): 10. Bibcode:2011AJ....141...75H. doi:10.1088/0004-6256/141/3/75. S2CID 14208889.
    8. Trilling, D. E.; Mueller, M.; Hora, J. L.; Harris, A. W.; Bhattacharya, B.; Bottke, W. F.; et al. (September 2010). "ExploreNEOs. I. Description and First Results from the Warm Spitzer Near-Earth Object Survey" (PDF). The Astronomical Journal. 140 (3): 770–784. Bibcode:2010AJ....140..770T. doi:10.1088/0004-6256/140/3/770. S2CID 3006566.
    9. Warner, Brian D. (January 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October". The Minor Planet Bulletin. 42 (1): 41–53. Bibcode:2015MPBu...42...41W. ISSN 1052-8091. PMC 7249511. PMID 32457969.
    10. Warner, Brian D. (July 2014). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin. 41 (3): 157–168. Bibcode:2014MPBu...41..157W. ISSN 1052-8091. PMC 7296834. PMID 32549046.
    11. Pravec, Petr; Wolf, Marek; Sarounová, Lenka (November 1998). "Lightcurves of 26 Near-Earth Asteroids". Icarus. 136 (1): 124–153. Bibcode:1998Icar..136..124P. doi:10.1006/icar.1998.5993.
    12. Koehn, Bruce W.; Bowell, Edward G.; Skiff, Brian A.; Sanborn, Jason J.; McLelland, Kyle P.; Pravec, Petr; et al. (October 2014). "Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2009 January through 2009 June". The Minor Planet Bulletin. 41 (4): 286–300. Bibcode:2014MPBu...41..286K. ISSN 1052-8091.
    13. Weidenschilling, S. J.; Chapman, C. R.; Davis, D. R.; Greenberg, R.; Levy, D. H. (August 1990). "Photometric geodesy of main-belt asteroids. III - Additional lightcurves". Icarus. 86 (2): 402–447. Bibcode:1990Icar...86..402W. doi:10.1016/0019-1035(90)90227-Z. ISSN 0019-1035.
    14. 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. S2CID 8342929.
    15. Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population". The Astronomical Journal. 142 (3): 12. Bibcode:2011AJ....142...85T. doi:10.1088/0004-6256/142/3/85.
    16. Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. arXiv:1310.2000. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. S2CID 119278697.
    17. 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.
    18. Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. S2CID 119258489.
    19. Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W.
    20. 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.
    21. Pravec, P.; Wolf, M.; Sarounová, L.; Mottola, S.; Erickson, A.; Hahn, G.; et al. (December 1997). "The Near-Earth Objects Follow-Up Program". Icarus. 130 (2): 275–286. Bibcode:1997Icar..130..275P. doi:10.1006/icar.1997.5816.
    22. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
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