Astronomy:1947 Iso-Heikkilä

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1947 Iso-Heikkilä
Discovery[1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date4 March 1935
Designations
(1947) Iso-Heikkilä
Named afterIso-Heikkilä (location)[2]
1935 EA
Minor planet categorymain-belt · (outer) [3]
Eos[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc81.94 yr (29,928 days)
|{{{apsis}}}|helion}}3.2712 AU
|{{{apsis}}}|helion}}3.0367 AU
3.1539 AU
Eccentricity0.0372
Orbital period5.60 yr (2,046 days)
Mean anomaly198.82°
Mean motion0° 10m 33.6s / day
Inclination11.912°
Longitude of ascending node90.908°
144.06°
Physical characteristics
Dimensions29.20 km (derived)[3]
30.72±0.86 km[5]
31.61±0.81 km[6]
Rotation period5.0158 h[7]
Geometric albedo0.049±0.009[6]
0.0571 (derived)[3]
0.091±0.006[5]
D[8] · C[3]
Absolute magnitude (H)10.80[5] · 11.4[1][3][6] · 11.51[7] · 11.61±0.33[8]


1947 Iso-Heikkilä, provisional designation 1935 EA, is a carbonaceous Eos asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 4 March 1935, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[9] It was named after the location of the discovering observatory, which is also known as the "Iso-Heikkilä Observatory".[2]

Orbit and classification

Iso-Heikkilä is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[4][10]:23 It orbits the Sun in the outer main-belt at a distance of 3.0–3.3 AU once every 5 years and 7 months (2,046 days). Its orbit has an eccentricity of 0.04 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken, and no prior identifications were made, the body's observation arc begins with its discovery observation.[9]

Physical characteristics

The C-type asteroid has been characterized as a rare and reddish D-type asteroid by Pan-STARRS' large-scale photometric survey.[8]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Iso-Heikkilä measures 30.7 and 31.6 kilometers in diameter, and its surface has an albedo of 0.091 and 0.049, respectively.[5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0571 and a diameter of 29.2 kilometers with an absolute magnitude of 11.4.[3]

Rotation period

In October 2005, a rotational lightcurve of Iso-Heikkilä was obtained from photometric observations by Slovak astronomer Adrián Galád. It gave a rotation period of 5.0158 hours with a brightness variation of 0.35 magnitude. However, the lightcurve is ambiguous and several alternative period solutions are possible ({{{1}}})[7]

Naming

This minor planet was named for the farm, which is located in the Iso-Heikkilä district and owned by Turku University. It became the site of the Turku Observatory, which is also called Iso-Heikkilä Observatory (Finnish: Iso-Heikkilän tähtitorni). It was the observatory's first minor planet discovery.[2] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450).[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1947 Iso-Heikkila (1935 EA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001947. Retrieved 10 June 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1947) Iso-Heikkilä". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 156. doi:10.1007/978-3-540-29925-7_1948. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (1947) Iso-Heikkilä". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1947%7CIso-Heikkilä. Retrieved 9 December 2016. 
  4. ↑ 4.0 4.1 "Asteroid 1947 Iso-Heikkila – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1947+Iso-Heikkila#Asteroid%201947%20Iso-HeikkilaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 26 October 2019. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 9 December 2016. 
  7. ↑ 7.0 7.1 7.2 Galád, A. (May 2010). "Accuracy of calibrated data from the SDSS moving object catalog, absolute magnitudes, and probable lightcurves for several asteroids". Astronomy and Astrophysics 514: 10. doi:10.1051/0004-6361/201014029. Bibcode: 2010A&A...514A..55G. 
  8. ↑ 8.0 8.1 8.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 9 December 2016. 
  9. ↑ 9.0 9.1 "1947 Iso-Heikkila (1935 EA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1947. Retrieved 9 December 2016. 
  10. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 9 December 2016. 

External links



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