1500 Jyväskylä

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1500 Jyväskylä
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 16 October 1938
MPC designation (1500) Jyväskylä
Pronunciation jyvæs-kylæ
Named after
Jyväskylä (Finnish city)[2]
1938 UH
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 68.59 yr (25,051 days)
Aphelion 2.6685 AU
Perihelion 1.8186 AU
2.2435 AU
Eccentricity 0.1894
3.36 yr (1,227 days)
0° 17m 35.88s / day
Inclination 7.4359°
Physical characteristics
Dimensions 6.63 km (calculated)[3]
7.39±1.59 km[4]
8.088±0.103 km[5]
8.095±0.136 km[6]
8.82750±0.00001 h[7]
0.24 (assumed)[3]
Tholen = S[1] · S[3]
B–V = 0.920[1]
U–B = 0.520[1]
12.76[4] · 13.06[1][3][5]

1500 Jyväskylä (jyvæs-kylæ), provisional designation 1938 UH, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 October 1938, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland.[8] It was named for the Finnish town Jyväskylä.[2]

Classification and orbit[edit]

Jyväskylä is a member of the Flora family, a large collisional group of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,227 days). Its orbit has an eccentricity of 0.19 and an inclination of 7° with respect to the ecliptic.[1] The body's observation arc begins at Turku, 3 weeks prior to its official discovery observation.[8]

Physical characteristics[edit]

In 2016, a modeled lightcurve was derived from data contained in the Lowell photometric database. Light-curve analysis gave it a rotation period of 8.8275 hours and a spin axis of (123°, −75.0°) in ecliptic coordinates (U=n.a.).[7]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 7.39 and 8.095 kilometers in diameter, and its surface has an albedo between 0.161 and 0.31.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this family – and calculates a diameter of 6.63 kilometers, using an absolute magnitude of 13.06.[3]


This minor planet was named for the Finnish town Jyväskylä.[2] It is the largest city in the region of Central Finland and on the Finnish Lakeland. The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3928).[9]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 1500 Jyvaskyla (1938 UH)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1500) Jyväskylä. Springer Berlin Heidelberg. p. 119. ISBN 978-3-540-00238-3. Retrieved 4 January 2017. 
  3. ^ a b c d e f "LCDB Data for (1500) Jyväskylä". Asteroid Lightcurve Database (LCDB). Retrieved 4 January 2017. 
  4. ^ a b c d 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 4 January 2017. 
  5. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 4 January 2017. 
  6. ^ a b c 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 4 January 2017. 
  7. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909Freely accessible. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 4 January 2017. 
  8. ^ a b "1500 Jyvaskyla (1938 UH)". Minor Planet Center. Retrieved 4 January 2017. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 January 2017. 

External links[edit]