1535 Päijänne

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1535 Päijänne
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 9 September 1939
MPC designation (1535) Päijänne
Pronunciation pæi(j)ænːe
Named after
Lake Päijänne (Finland)[2]
1939 RC · 1933 QE1
1944 OA · 1956 XB
1985 XE2 · A916 OB
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 83.77 yr (30,598 days)
Aphelion 3.7718 AU
Perihelion 2.5586 AU
3.1652 AU
Eccentricity 0.1916
5.63 yr (2,057 days)
0° 10m 30s / day
Inclination 6.0561°
Physical characteristics
Dimensions 23.836±0.206 km[4]
25.518±0.187 km[5]
26.12±0.42 km[6]
26.36 km (derived)[3]
26.72±1.0 km[7]
8.8448±0.0007 h[8]
0.0638 (derived)[3]
CX [9] · S[3]
10.7[5][6][7] · 11.44±0.09[9] · 11.5[1][3]

1535 Päijänne (pæi(j)ænːe), provisional designation 1939 RC, is an asteroid from the outer region of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 9 September 1939, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland.[10] It was later named for Lake Päijänne.[2]


Päijänne orbits the Sun in the outer main-belt at a distance of 2.6–3.8 AU once every 5 years and 8 months (2,057 days). Its orbit has an eccentricity of 0.19 and an inclination of 6° with respect to the ecliptic.[1] It was first identified as A916 OB at Simeiz Observatory in 1916. The body's observation arc begins 6 years prior to its official discovery with its identification as 1933 QE1 at Heidelberg Observatory.[10]

Physical characteristics[edit]

Päijänne is classified as both S-type and transitional CX-type asteroid.[3][9]


In September 2006, a rotational lightcurve of Päijänne was obtained from photometric observations taken by French amateur astronomer Laurent Bernasconi. The lightcurve analysis gave a well-defined rotation period of 8.8448 hours with a change in brightness of 0.50 magnitude (U=3).[8]

Diameter and albedo[edit]

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, Päijänne measures between 23.836 and 26.72 kilometers in diameter, and its surface has an albedo between 0.1299 and 0.164.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0638 and a diameter of 26.36 kilometers with an absolute magnitude of 11.5.[3]


This minor planet was named for Finland's second largest lake, Päijänne, located in south-central Finland, and more than a thousand square kilometers in size.[2] The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3929).[11]


  1. ^ a b c d "JPL Small-Body Database Browser: 1535 Paijanne (1939 RC)" (2017-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1535) Päijänne. Springer Berlin Heidelberg. p. 122. ISBN 978-3-540-00238-3. Retrieved 31 December 2016. 
  3. ^ a b c d e f g "LCDB Data for (1535) Päijänne". Asteroid Lightcurve Database (LCDB). Retrieved 31 December 2016. 
  4. ^ 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 31 December 2016. 
  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 31 December 2016. 
  6. ^ 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 31 December 2016. 
  7. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 31 December 2016. 
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1535) Päijänne". Geneva Observatory. Retrieved 31 December 2016. 
  9. ^ a b c 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 31 December 2016. 
  10. ^ a b "1535 Paijanne (1939 RC)". Minor Planet Center. Retrieved 31 December 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 December 2016. 

External links[edit]