2575 Bulgaria

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2575 Bulgaria
Discovery [1]
Discovered byT. Smirnova
Discovery siteCrimean Astrophysical Obs.
Discovery date4 August 1970
MPC designation(2575) Bulgaria
Named after
(European country)[2]
1970 PL · 1970 QD
1977 RQ6 · 1980 PY
A923 PB
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.80 yr (34,259 days)
Aphelion2.5157 AU
Perihelion1.9645 AU
2.2401 AU
3.35 yr (1,225 days)
0° 17m 38.4s / day
Physical characteristics
Dimensions6.41±0.29 km[4]
7.08 km (calculated)[3]
8.010±0.065 km[5]
8.6157±0.0082 h[6]
9.480±0.001 h[7]
0.24 (assumed)[3]
SMASS = Sr [1] · S[3]
12.466±0.003 (R)[6] · 12.6[5][4] · 12.7[1] · 12.92[3] · 13.31±0.29[8]

2575 Bulgaria, provisional designation 1970 PL, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 4 August 1970, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[9] It was named for country Bulgaria.[2]

Classification and orbit[edit]

Bulgaria is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,225 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic.[1]

Physical characteristics[edit]

In the SMASS taxonomy, Bulgaria has been classified as a Sr-type, which transitions from common S-type asteroids to the rather rare R-type asteroids.[1]

Bulgaria has a rotation period of 8.6 hours[6] and an albedo of 0.24, as assumed by the Collaborative Asteroid Lightcurve Link.[3]


This minor planet was named after the European country Bulgaria. At the time of naming, it was the People's Republic of Bulgaria (1946–1990), a former satellite state of the Soviet Union and member of the Warsaw Pact.[2] The official naming citation was published by the Minor Planet Center on 13 July 1984 (M.P.C. 8912).[10]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2575 Bulgaria (1970 PL)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2575) Bulgaria". Dictionary of Minor Planet Names – (2575) Bulgaria. Springer Berlin Heidelberg. p. 210. doi:10.1007/978-3-540-29925-7_2576. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (2575) Bulgaria". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2016.
  4. ^ a b c 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 December 2016.
  5. ^ a b c 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.
  6. ^ a b c 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 6 December 2016.
  7. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (2575) Bulgaria". Geneva Observatory. Retrieved 6 December 2016.
  8. ^ 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 December 2016.
  9. ^ "2575 Bulgaria (1970 PL)". Minor Planet Center. Retrieved 6 December 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 December 2016.

External links[edit]