1567 Alikoski, provisional designation 1941 HN, is a rare-type carbonaceous asteroid from the outer region of the asteroid belt, approximately 67 kilometers in diameter. It was discovered on 22 April 1941, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[11] It was later named after Finnish astronomer Heikki Alikoski.[2]

1567 Alikoski
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date22 April 1941
MPC designation(1567) Alikoski
Named after
Heikki Alikoski (astronomer)[2]
1941 HN · 1947 HE
1947 HG · 1948 OC
main-belt · (outer)[1]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc78.55 yr (28,691 days)
Aphelion3.4785 AU
Perihelion2.9417 AU
3.2101 AU
5.75 yr (2,101 days)
0° 10m 17.04s / day
Physical characteristics
Dimensions62.36±17.29 km[3]
67.83±2.1 km (IRAS:12)[4]
67.933±0.584 km[5]
69.242±0.432 km[6]
70.06±0.80 km[7]
77.10±19.58 km[8]
16.405±0.01 h[9]
0.0626±0.004 (IRAS:12)[4]
PU (Tholen)[1]
C (SMASS)[1] · C[10]
B–V = 0.720[1]

Classification and orbitEdit

This asteroid orbits the Sun in the outer main-belt at a distance of 2.9–3.5 AU once every 5 years and 9 months (2,101 days). Its orbit has an eccentricity of 0.08 and an inclination of 17° with respect to the ecliptic.[1] Alikoski's observation arc begins with a precovery taken at Turku in 1938, extending it by 3 years prior to the asteroid's official discovery observation.[11]

Physical characteristicsEdit

Spectral typeEdit

Alikoski is characterized as both a carbonaceous C-type asteroid and as a rare PU-type in the SMASS and Tholen taxonomic scheme, respectively.[1]

Rotation periodEdit

In March 2004, a rotational lightcurve of Alikoski was obtained by American amateur astronomer Robert Stephens at Santana Observatory in California. Lightcurve analysis gave a well-defined rotation period of 16.405 hours with a brightness variation of 0.16 magnitude (U=3).[9]

Diameter and albedoEdit

According to the space-based 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, Alikoski measures between 62.36 and 77.10 kilometers in diameter, and its surface has a low albedo between 0.04 and 0.062.[3][4][5][6][7][8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0626 and a diameter of 67.83 kilometers based on an absolute magnitude of 9.47.[10]


This minor planet was named in honor of Finnish astronomer Heikki Alikoski (1912–1997), assistant to the discoverer from 1937 to 1956, and an observer and discoverer of minor planets himself. He also helped greatly in establishing the Turku Astronomical-Optical Institute.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3930).[12]


  1. ^ a b c d e f g h i "JPL Small-Body Database Browser: 1567 Alikoski (1941 HN)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1567) Alikoski". Dictionary of Minor Planet Names – (1567) Alikoski. Springer Berlin Heidelberg. p. 124. doi:10.1007/978-3-540-29925-7_1568. ISBN 978-3-540-00238-3.
  3. ^ 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:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 30 December 2016.
  4. ^ 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 – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
  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". 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 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 30 December 2016.
  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 17 October 2019. (online, AcuA catalog p. 153)
  8. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 30 December 2016.
  9. ^ a b Stephens, Robert D. (September 2004). "Photometry of 966 Muschi, 1567 Alikoski, and 2331 Parvulesco". The Minor Planet Bulletin. 31 (3): 60–61. Bibcode:2004MPBu...31...60S. ISSN 1052-8091. Retrieved 30 December 2016.
  10. ^ a b c "LCDB Data for (1567) Alikoski". Asteroid Lightcurve Database (LCDB). Retrieved 30 December 2016.
  11. ^ a b "1567 Alikoski (1941 HN)". Minor Planet Center. Retrieved 30 December 2016.
  12. ^ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External linksEdit