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1479 Inkeri, provisional designation 1938 DE, is an asteroid from the central regions of the asteroid belt. It is an exceptionally slow rotator, suspected tumbler and measures approximately 19 kilometers in diameter. It was discovered on 16 February 1938, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, Finland. "Inkeri" is the name of two of the discoverer's younger relatives as well as the local name of the former Finnish province of Ingria.

Orbit and classification

Inkeri is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,601 days). Its orbit has an eccentricity of 0.19 and an inclination of 7° with respect to the ecliptic.

The asteroid was first identified as A916 AC at Simeiz Observatory in January 1916. The body's observation arc begins with its identification as 1923 RG at Heidelberg Observatory in September 1923, more than 14 years prior to its official discovery observation at Turku.

Physical characteristics

In the Tholen classification, Inkeri's spectral type is ambiguous (XFU). It is closest to that of an X-type asteroid and somewhat similar to the F-types. In addition, the spectrum has also been flagged as "unusual" (U).

Slow rotator and tumbler

In December 2011, a rotational lightcurve of Inkeri was obtained from photometric observations by Andrea Ferrero at the Bigmuskie Observatory (B88), Italy, in collaboration with Frederick Pilcher at the Organ Mesa Observatory (G50) in New Mexico, United States. Analysis of the bimodal lightcurve gave an exceptionally long rotation period of 660 hours with a brightness amplitude of 1.30 magnitude (U=2+).

This makes it one of the slowest rotators known to exist. The observers also suspect that the body is a tumbling asteroid in a non-principal axis rotation. These results supersede previous period solutions of 5 and 12.55 hours (U=1/1).

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Inkeri measures between 15.206 and 31.86 kilometers in diameter and its surface has an albedo between 0.033 and 0.2222.

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a diameter of 18.35 kilometers based on an absolute magnitude of 11.8.

Naming

This minor planet was named "Inkeri", a Finnish female name, held by Vaisala's granddaughter and niece. It is also the Finnish name of Ingria, a formerly-Finnish province near Saint Petersburg that is now part of Russia. The official naming citation was published by the Minor Planet Center in January 1956 (M.P.C. 1350).

References

1. ^ "JPL Small-Body Database Browser: 1479 Inkeri (1938 DE)" (2017-05-01 last obs.). Jet Propulsion Laboratory. Retrieved 20 October 2017.
2. ^ Schmadel, Lutz D. (2007). "(1479) Inkeri". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 118. doi:10.1007/978-3-540-29925-7_1480. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (1479) Inkeri". Asteroid Lightcurve Database (LCDB). Retrieved 20 October 2017.
4. ^ "Asteroid 1479 Inkeri – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
5. ^ 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. S2CID 118745497. Retrieved 20 October 2017.
6. ^ 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. S2CID 35447010.
7. ^ 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.
8. ^ 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. (online, AcuA catalog p. 153)
9. ^ 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. S2CID 46350317. Retrieved 20 October 2017.
10. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1479) Inkeri". Geneva Observatory. Retrieved 20 October 2017.
11. ^ Brinsfield, James W. (September 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008". The Minor Planet Bulletin. 35 (3): 119–122. Bibcode:2008MPBu...35..119B. ISSN 1052-8091. Retrieved 20 October 2017.
12. ^ Ferrero, Andrea; Pilcher, Frederick (July 2012). "The Very Long Period of 1479 Inkeri". The Minor Planet Bulletin. 39 (3): 192–193. Bibcode:2012MPBu...39..192F. ISSN 1052-8091. Retrieved 20 October 2017.
13. 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. S2CID 53493339. Retrieved 20 October 2017.
14. ^ "1479 Inkeri (1938 DE)". Minor Planet Center. Retrieved 20 October 2017.
15. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. 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
• 1479 Inkeri at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1479 Inkeri at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Yrjö Väisälä
• Named minor planets
• Slow rotating minor planets
• XFU-type asteroids (Tholen)
• Astronomical objects discovered in 1938