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1536 Pielinen, provisional designation 1939 SE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7.8 kilometers in diameter. It was discovered on 18 September 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland. It was later named for Finnish lake Pielinen.

Classification and orbit

Pielinen is a member of the Flora family, a large group of stony S-type asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,195 days). Its orbit has an eccentricity of 0.20 and an inclination of 2° with respect to the ecliptic. Pielinen was first identified as A903 SF at Heidelberg in 1903, extending the body's observation arc by 36 years prior to its official discovery observation.

Lightcurves

From September to November 2011, four rotational lightcurves of Pielinen were obtained from photometric observations. One lightcurve analysis gave a rotation period of 66.2 hours, which is significantly longer than for most minor planets, that spin every 2 to 20 hours around their axis. However, slow rotators have periods typically above 100 hours. Photometric observations were taken by Petr Pravec (66.22 hours, Δ0.85 mag, U=3), Robert D. Stephens (66.34 hours, Δ0.80 mag, U=3-), Giovanni Casalnuovo (66.1 hours, Δ0.75 mag, U=2+), and Silvano Casulli (67.43 hours, Δ0.81 mag, U=2).

Diameter and albedo

According to the space-based survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Pielinen measures between 7.38 and 7.975 kilometers in diameter and its surface has an albedo between 0.253 and 0.30. 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 7.82 kilometers, with an absolute magnitude of 12.7.

Naming

This minor planet is named after Pielinen, Finland's fourth largest lake in Finnish Karelia. The Koli National Park is located on its western shores. The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3930).

Notes

1. ^ Pravec (2011) web: rotation period 66.22 hours with a brightness amplitude of 0.85 mag. Quality Code: 3. Summary figures for (1536) Pielinen at Collaborative Asteroid Lightcurve Link (CALL)
2. ^ Stephens (2011) web. Observations in September 2011, gave a rotation period of 66.34±0.02 hours with a brightness amplitude of 0.80 mag. Quality Code of 3-. Summary figures for (1536) Pielinen at Collaborative Asteroid Lightcurve Link (CALL)
3. Lightcurve plot for (1536) Pielinen by Petr Pravec of the Ondrejov Asteroid Photometry Project source data)

References

1. ^ "JPL Small-Body Database Browser: 1536 Pielinen (1939 SE)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(1536) Pielinen". Dictionary of Minor Planet Names – (1536) Pielinen. Springer Berlin Heidelberg. p. 122. doi:10.1007/978-3-540-29925-7_1537. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (1536) Pielinen". Asteroid Lightcurve Database (LCDB). Retrieved 30 December 2016.
4. ^ 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.
5. ^ 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. ^ 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. ^ Casalnuovo, Giovanni Battista (April 2016). "Lightcurve Analysis for Nine Main Belt Asteroids". The Minor Planet Bulletin. 43 (2): 112–115. Bibcode:2016MPBu...43..112C. ISSN 1052-8091. Retrieved 30 December 2016.
8. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1536) Pielinen". Geneva Observatory. Retrieved 30 December 2016.
9. ^ 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 30 December 2016.
10. ^ "1536 Pielinen (1939 SE)". Minor Planet Center. Retrieved 30 December 2016.
11. 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 links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1536 Pielinen at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1536 Pielinen at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Flora asteroids
• Discoveries by Yrjö Väisälä
• Named minor planets
• Astronomical objects discovered in 1939