2052 Tamriko

2052 Tamriko, provisional designation 1976 UN, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 24 October 1976, by Richard Martin West at ESO's La Silla Observatory in northern Chile.[14] The asteroid was named after the discoverer's wife Tamara West.[2]

2052 Tamriko
Discovery [1]
Discovered byR. M. West
Discovery siteLa Silla Obs.
Discovery date24 October 1976
Designations
(2052) Tamriko
Named after
Tamara West
(discoverer's wife)[2]
1976 UN · 1928 TD
1939 YA · 1942 JE
1949 UV · 1951 CP1
1952 FL · 1952 HL2
1954 TS · 1975 WB2
A902 UB
main-belt · (outer)
Eos [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc114.10 yr (41,676 days)
Aphelion3.2627 AU
Perihelion2.7529 AU
3.0078 AU
Eccentricity0.0848
5.22 yr (1,905 days)
340.25°
0° 11m 20.04s / day
Inclination9.5008°
213.86°
204.82°
Physical characteristics
Dimensions26.799±0.156 km[5]
27.51±0.50 km[6]
27.574±0.238 km[7]
29.11±5.31 km[8]
30.45±2.2 km (IRAS:3)[9]
7.462±0.003 h[10]
7.470±0.002 h[11][lower-alpha 1]
7.4702±0.0004 h[12]
7.471±0.001 h[12]
0.1225±0.020 (IRAS:3)[9]
0.144±0.190[8]
0.150±0.006[6]
0.1508±0.0467[7]
0.158±0.025[5]
Tholen = S [1] · S [3]
B–V = 0.825[1]
U–B = 0.433[1]
10.40[8] · 10.48[1][3][6][7][9] · 10.57±0.18[13]

    Orbit and classification

    Tamriko is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[4][15]:23 It orbits the Sun in the outer main-belt at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,905 days). Its orbit has an eccentricity of 0.08 and an inclination of 10° with respect to the ecliptic.[1]

    The asteroid was first identified as A902 UB at Heidelberg Observatory in October 1902. Its observation arc begins 24 years prior to the official discovery observation, with its identification 1952 FL at Goethe Link Observatory in March 1952.[14]

    Physical characteristics

    In the Tholen classification, Tamriko is a stony S-type asteroid.[1]

    Rotation period

    Between 2001 and 2011, four rotational lightcurve of Tamriko were obtained from photometric observations by Edwin Sheridan, Pierre Antonini, Laurent Bernasconi and Brian Warner. Lightcurve analysis gave a rotation period between 7.462 and 7.471 hours with a brightness variation between 0.11 and 0.15 magnitude (U=2/2/2/2).[10][11][12][lower-alpha 1]

    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, Tamriko measures between 26.799 and 30.45 kilometers in diameter and its surface has an albedo between 0.1225 and 0.158.[5][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, a standard albedo of 0.1225 and a diameter of 30.45 kilometers with an absolute magnitude of 10.48.[3]

    Naming

    This minor planet was named for Tamara West, wife of the discoverer Richard Martin West.[2] The official naming citation was published by the Minor Planet Center on 1 July 1979 (M.P.C. 4786).[16]

    Notes
    1. lightcurve plot of (2052) Tamriko, with a rotation period 7.470 hours and a brightness amplitude of 0.15 magnitude. Observation by Brian Warner, Palmer Divide Observatory (2011).

    References
    1. "JPL Small-Body Database Browser: 2052 Tamriko (1976 UN)" (2016-11-30 last obs.). Jet Propulsion Laboratory. Retrieved 6 July 2017.
    2. Schmadel, Lutz D. (2007). "(2052) Tamriko". Dictionary of Minor Planet Names – (2052) Tamriko. Springer Berlin Heidelberg. p. 166. doi:10.1007/978-3-540-29925-7_2053. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2052) Tamriko". Asteroid Lightcurve Database (LCDB). Retrieved 6 July 2017.
    4. "Asteroid 2052 Tamriko – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    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 6 July 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. 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.
    8. 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.
    9. 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.
    10. Sheridan, E. E. (June 2002). "Rotational Periods and Lightcurve Photometry of 697 Galilea, 1086 Nata, 2052 Tamriko, 4451 Grieve, and (27973) 1997 TR25". The Minor Planet Bulletin. 29: 32–33. Bibcode:2002MPBu...29...32S. Retrieved 6 July 2017.
    11. Warner, Brian D. (January 2012). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2011 June - September". The Minor Planet Bulletin. 39 (1): 16–21. Bibcode:2012MPBu...39...16W. ISSN 1052-8091. Retrieved 6 July 2017.
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (2052) Tamriko". Geneva Observatory. Retrieved 6 July 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 6 July 2017.
    14. "2052 Tamriko (1976 UN)". Minor Planet Center. Retrieved 6 July 2017.
    15. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    16. 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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