2047 Smetana

2047 Smetana, provisional designation 1971 UA1, is a bright Hungaria asteroid and synchronous binary system from the innermost regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg, Germany.[11] The asteroid was named after Czech composer Bedřich Smetana.[3] Its sub-kilometer sized minor-planet moon was discovered in 2012.

2047 Smetana
Discovery [1]
Discovered byL. Kohoutek
Discovery siteBergedorf Obs.
Discovery date26 October 1971
Designations
(2047) Smetana
Pronunciation/ˈsmɛtənə/[2]
Named after
Bedřich Smetana
(Czech composer)[3]
1971 UA1
main-belt · (inner) [1] · Hungaria [1]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc44.77 yr (16,353 days)
Aphelion1.8783 AU
Perihelion1.8658 AU
1.8720 AU
Eccentricity0.0033
2.56 yr (936 days)
16.211°
0° 23m 5.28s / day
Inclination25.281°
36.611°
307.99°
Known satellites1 [4][5][6]
Physical characteristics
Dimensions3.131±0.153 km[7]
3.85 km (calculated)[4]
2.4801±0.0005 h[8][lower-alpha 1]
2.4969±0.0004 h[9][lower-alpha 1]
2.4970±0.0003 h[6][lower-alpha 1]
2.498±0.001 h[10]
0.3 (assumed)[4]
0.544±0.069[7]
E [4]
13.80[7] · 14.0[1][4] · 14.25±0.05[6]

    Classification and orbit

    Smetana is a bright member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun in the inner main-belt at a distance of 1.9–1.9 AU once every 2 years and 7 months (936 days). Its orbit has an eccentricity of 0.00 and an inclination of 25° with respect to the ecliptic.[1] The asteroid's observation arc begins with its official discovery observation at Bergedorf, with no precoveries taken, and no prior identifications made.[11]

    Physical characteristics

    Smetana is an assumed E-type asteroid.[4]

    Lightcurves

    Between 2006 and 2012, several rotational lightcurves of Smetana were obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) and CS3–Palmer Divide Station (U82) in Colorado and California, respectively. Lightcurve analysis gave a rotation period between 2.4801 and 2.498 hours with a brightness variation of between 0.12 and 0.16 magnitude (U=2+/2+/3/3).[6][8][9][10][lower-alpha 1]

    Satellite

    During Warner's photometric observations in 2012, it was revealed that Smetana is a synchronous binary asteroid with an orbiting minor-planet moon. The satellite, designated S/2012 (2047) 1, orbits its primary every 22.43 hours and measures approximately 0.63 kilometers in diameter.[5][6] However the binary status of Smetana has not yet been confirmed unambiguously, since observations in 2016 could not clearly detect any mutual occultation and eclipsing events.[10]

    Diameter and albedo

    According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Smetana measures 3.131 kilometers in diameter and its surface has an albedo of 0.544.[7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids both as family and orbital group – and calculates a diameter of 3.85 kilometers with an absolute magnitude of 14.0.[4]

    Naming

    This minor planet was named for the Czech national composer Bedřich Smetana (1824–1884), best known for the opera The Bartered Bride, the cycle of six symphonic poems My homeland and the string quartet From my life.[3] The official naming citation was published by the Minor Planet Center on 1 July 1979 (M.P.C. 4786).[12]

    Notes
    1. Warner (2006/11/12): Lightcurve plots of (2047) Smetana from 2006, 2011 and 2012 (two plots) by Brian Warner at the PDO and PDS. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)
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    References
    1. "JPL Small-Body Database Browser: 2047 Smetana (1971 UA1)" (2016-08-03 last obs.). Jet Propulsion Laboratory. Retrieved 6 July 2017.
    2. "Smetana". Merriam-Webster Dictionary.
    3. Schmadel, Lutz D. (2007). "(2047) Smetana". Dictionary of Minor Planet Names – (2047) Smetana. Springer Berlin Heidelberg. p. 166. doi:10.1007/978-3-540-29925-7_2048. ISBN 978-3-540-00238-3.
    4. "LCDB Data for (2047) Smetana". Asteroid Lightcurve Database (LCDB). Retrieved 6 July 2017.
    5. Johnston, Robert (21 September 2014). "(2047) Smetana". johnstonsarchive.net. Retrieved 6 July 2017.
    6. Warner, Brian D. (April 2013). "Seeing Double Old and New: Observations and Lightcurve Analysis at the Palmer Divide Observatory of Six Binary Asteroids". The Minor Planet Bulletin. 40 (2): 94–98. Bibcode:2013MPBu...40...94W. ISSN 1052-8091. Retrieved 6 July 2017.
    7. 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 6 July 2017.
    8. Warner, Brian D. (July 2011). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 December- 2011 March". The Minor Planet Bulletin. 38 (3): 142–149. Bibcode:2011MPBu...38..142W. ISSN 1052-8091. Retrieved 6 July 2017.
    9. Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006". The Minor Planet Bulletin. 33 (4): 85–88. Bibcode:2006MPBu...33...85W. ISSN 1052-8091. Retrieved 6 July 2017.
    10. Warner, Brian D. (October 2016). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 April-July". The Minor Planet Bulletin. 43 (4): 300–304. Bibcode:2016MPBu...43..300W. ISSN 1052-8091. Retrieved 6 July 2017.
    11. "2047 Smetana (1971 UA1)". Minor Planet Center. Retrieved 6 July 2017.
    12. 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. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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