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1989 Tatry, provisional designation 1955 FG, is a carbonaceous Vestian asteroid and tumbling slow rotator from the inner regions of the asteroid belt, approximately 16 kilometers in diameter.

1989 Tatry
Discovery [1]
Discovered byA. Paroubek
R. Podstanicka
Discovery siteSkalnaté Pleso Obs.
Discovery date20 March 1955
MPC designation(1989) Tatry
Named after
High Tatra Mountains
(in northern Slovakia)[2]
1955 FG · 1935 UQ
1944 DL · 1955 DY
1964 WK · 1968 YC
1971 SJ2
main-belt · Vestian[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc81.63 yr (29,815 days)
Aphelion2.5314 AU
Perihelion2.1704 AU
2.3509 AU
3.60 yr (1,317 days)
0° 16m 24.24s / day
Physical characteristics
Dimensions8.99±2.38 km[4]
9.399±0.122 km[5]
9.603±0.063 km[6]
9.87±0.88 km[7]
16.81 km (calculated)[3]
24 h[8]
39.9±0.1 h[9]
131.3±0.2 h[10]
0.057 (assumed)[3]
SMASS = C[1][3]
12.10[7] · 12.10±0.91[11] · 12.40[4] · 12.5[6] · 12.6[1][3]

It was discovered on 20 March 1955, by the Slovakian astronomers Alois Paroubek and Regina Podstanická at Skalnate Pleso Observatory, Slovakia, and named for the High Tatra Mountains.[2][12] It was their only minor planet discovery.

Orbit and classificationEdit

Based on its orbital elements, the asteroid is a member of the Vesta family and classified as a carbonaceous C-type asteroid in the SMASS taxonomy. It orbits the Sun in the inner main-belt at a distance of 2.2–2.5 AU once every 3 years and 7 months (1,317 days). Its orbit has an eccentricity of 0.08 and an inclination of 8° with respect to the ecliptic.[1] It was first identified as 1935 UQ at the South African Union Observatory in 1935, extending the asteroid's observation arc by 20 years prior to its official discovery.[12]

Diameter and albedoEdit

According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 8.99 and 9.87 kilometers in diameter and its surface has an albedo between 0.175 and 0.262.[4][5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a much larger diameter of 16.8 kilometers, as the lower the albedo (reflectivity), the higher the diameter at a constant absolute magnitude (brightness).[3]


Photometric measurements of the asteroid made in January 2005, by astronomer Brian D. Warner at his Palmer Divide Observatory, Colorado, gave a lightcurve with a period of 39.9±0.1 hours and a brightness variation of below 0.22±0.02 in magnitude. However, the data was incomplete, so the period is considered suspect (U=2-).[9] Further measurements made in October 2007, by Adrián Galád, Leonard Kornoš and Štefan Gajdoš at Modra Observatory in Slovakia, showed a much longer period of 131.3±0.2 hours with a brightness variation of 0.5 in magnitude (U=2).[10] In March 2009, a fragmentary lightcurve obtained by French amateur astronomer Pierre Antonini gave a period of 24 hours (U=1).[8]


The observers also detected a non-principal axis rotation seen in distinct rotational cycles in successive order. This is commonly known as tumbling.[3][10][13] Tatry is one of a group of less than 200 bodies known to be is such a state (also see List of tumblers).


This minor planet is named after the location of the discovering observatory, High Tatras (Czech: Vysoké Tatry), the highest mountain range in northern Slovakia.[2] The approved naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5183).[14]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1989 Tatry (1955 FG)" (2017-06-02 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1989) Tatry". Dictionary of Minor Planet Names – (1989) Tatry. Springer Berlin Heidelberg. p. 161. doi:10.1007/978-3-540-29925-7_1990. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1989) Tatry". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2016.
  4. ^ a b c d 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 2 November 2016.
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 2 November 2016.
  6. ^ a b c d 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.
  7. ^ a b c d 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 2 November 2016.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1989) Tatry". Geneva Observatory. Retrieved 2 November 2016.
  9. ^ a b Warner, Brian D. (September 2005). "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005". The Minor Planet Bulletin. 32 (3): 54–58. Bibcode:2005MPBu...32...54W. ISSN 1052-8091. Retrieved 2 November 2016.
  10. ^ a b c Galad, Adrian; Kornos, Leonard; Gajdos, Stefan (January 2009). "Lightcurves of Eight Selected Asterois from Modra". The Minor Planet Bulletin. 36 (1): 13–15. Bibcode:2009MPBu...36...13G. ISSN 1052-8091. Retrieved 2 November 2016.
  11. ^ 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 2 November 2016.
  12. ^ a b "1989 Tatry (1955 FG)". Minor Planet Center. Retrieved 2 November 2016.
  13. ^ Pravec, P.; Scheirich, P.; Durech, J.; Pollock, J.; Kusnirák, P.; Hornoch, K.; et al. (May 2014). "The tumbling spin state of (99942) Apophis". Icarus. 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Retrieved 23 November 2017.
  14. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 2 November 2016.

External linksEdit