1284 Latvia

1284 Latvia, provisional designation 1933 OP, is a rare-type asteroid from the middle region of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 27 July 1933, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after the Republic of Latvia.[2][15]

1284 Latvia
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date27 July 1933
Designations
(1284) Latvia
Named after
Latvia (Republic of Latvia)[2]
1933 OP · 1925 WK
1931 DW · 1933 QP
1950 RL
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc83.45 yr (30,481 days)
Aphelion3.0967 AU
Perihelion2.1952 AU
2.6459 AU
Eccentricity0.1704
4.30 yr (1,572 days)
78.834°
0° 13m 44.4s / day
Inclination10.874°
302.96°
114.40°
Physical characteristics
Dimensions33.27±7.09 km[4]
36.81±1.2 km (IRAS:18)[5]
41.128±0.457 km[6]
41.47±0.52 km[7]
45.19±0.74 km[8]
47.255±0.627 km[9]
9.55±0.01 h[10]
9.552±0.001 h[11]
9.644±0.002 h[12]
18 h[13]
0.0634±0.0058[9]
0.069±0.011 [8]
0.083±0.003[7]
0.1045±0.007 (IRAS:18)[5]
0.13±0.06[4]
B–V = 0.768[1]
U–B = 0.353[1]
T (Tholen),[1] L (SMASS)[1] · L [3]
10.20±0.17[14] · 10.23[4] · 10.24[1][3][5][7][8][9]

    Orbit and classification

    Latvia orbits the Sun in the middle main-belt at a distance of 2.2–3.1 AU once every 4 years and 4 months (1,572 days). Its orbit has an eccentricity of 0.17 and an inclination of 11° with respect to the ecliptic.[1]

    It was first identified as 1925 WK at Moscow Observatory (105) in 1925, and then as 1931 DW at Lowell Observatory in 1931. The body's observation arc begins with its official discovery observation at Heidelberg in 1933.[15]

    Physical characteristics

    Spectral type

    Latvia is classified as a rare T and L type asteroid in the Tholen and SMASS taxonomy scheme, respectively, both indicating a featureless spectra of a dark and reddish body.[1]

    Rotation period

    The so-far best rated rotational lightcurve of Latvia was obtained by the "Spanish Photometric Asteroid Analysis Group" (OBAS) in September 2015. Lightcurve analysis gave it a rotation period of 9.55 hours with a brightness variation of 0.23 magnitude (U=3-).[10]

    Previous photometric observations by James W. Brinsfield at Via Capote Observatory (G69) and French amateur astronomer Laurent Bernasconi gave a period of 9.552 and 9.644 hours with an amplitude of 0.10 and 0.21 magnitude, respectively (U=2/2).[11][12] The first rotational lightcurve obtained by Richard P. Binzel in the 1980s gave a twice a long period solution of 18 hours (U=1).[13]

    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, Latvia measures between 33.27 and 41.47 kilometers in diameter, and its surface has an albedo between 0.083 and 0.13 (without preliminary results).[4][5][6][7] The Collaborative Asteroid Lightcurve Link adopts the results by IRAS, that is an albedo of 0.1045 and a diameter of 36.81 kilometers with an absolute magnitude of 10.24.[3]

    Naming

    This minor planet was named after the Republic of Latvia.[2] Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 118).[2]

    References
    1. "JPL Small-Body Database Browser: 1284 Latvia (1933 OP)" (2017-01-08 last obs.). Jet Propulsion Laboratory. Retrieved 23 January 2017.
    2. Schmadel, Lutz D. (2007). "(1284) Latvia". Dictionary of Minor Planet Names – (1284) Latvia. Springer Berlin Heidelberg. p. 106. doi:10.1007/978-3-540-29925-7_1285. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1284) Latvia". Asteroid Lightcurve Database (LCDB). Retrieved 23 January 2017.
    4. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 23 January 2017.
    5. 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.
    6. 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 23 January 2017.
    7. 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)
    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 23 January 2017.
    9. 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.
    10. Garceran, Alfonso Carreno; Aznar, Amadeo; Mansego, Enrique Arce; Rodriguez, Pedro Brines; de Haro, Juan Lozano; Silva, Alvaro Fornas; et al. (January 2016). "Nineteen Asteroids Lightcurves at Asteroids Observers (OBAS) – MPPD: 2015 April – September". The Minor Planet Bulletin. 43 (1): 92–97. Bibcode:2016MPBu...43...92G. ISSN 1052-8091. Retrieved 23 January 2017.
    11. Brinsfield, James W. (September 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008". The Minor Planet Bulletin. 35 (3): 119–122. Bibcode:2008MPBu...35..119B. ISSN 1052-8091. Retrieved 23 January 2017.
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (1284) Latvia". Geneva Observatory. Retrieved 23 January 2017.
    13. Binzel, R. P.; Mulholland, J. D. (December 1983). "A photoelectric lightcurve survey of small main belt asteroids". Icarus. 56 (3): 519–533. Bibcode:1983Icar...56..519B. doi:10.1016/0019-1035(83)90170-7. ISSN 0019-1035. Retrieved 23 January 2017.
    14. 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 23 January 2017.
    15. "1284 Latvia (1933 OP)". Minor Planet Center. Retrieved 23 January 2017.

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