1947 Iso-Heikkilä

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]

1947 Iso-Heikkilä
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date4 March 1935
Designations
(1947) Iso-Heikkilä
Named after
Iso-Heikkilä (location)[2]
1935 EA
main-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)
Aphelion3.2712 AU
Perihelion3.0367 AU
3.1539 AU
Eccentricity0.0372
5.60 yr (2,046 days)
198.82°
0° 10m 33.6s / day
Inclination11.912°
90.908°
144.06°
Physical characteristics
Dimensions29.20 km (derived)[3]
30.72±0.86 km[5]
31.61±0.81 km[6]
5.0158 h[7]
0.049±0.009[6]
0.0571 (derived)[3]
0.091±0.006[5]
D [8] · C [3]
10.80[5] · 11.4[1][3][6] · 11.51[7] · 11.61±0.33[8]

    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 (U=n.a.)[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. "JPL Small-Body Database Browser: 1947 Iso-Heikkila (1935 EA)" (2017-02-08 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2017.
    2. Schmadel, Lutz D. (2007). "(1947) Iso-Heikkilä". Dictionary of Minor Planet Names – (1947) Iso-Heikkilä. Springer Berlin Heidelberg. p. 156. doi:10.1007/978-3-540-29925-7_1948. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1947) Iso-Heikkilä". Asteroid Lightcurve Database (LCDB). Retrieved 9 December 2016.
    4. "Asteroid 1947 Iso-Heikkila – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 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)
    6. 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. Retrieved 9 December 2016.
    7. 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. Bibcode:2010A&A...514A..55G. doi:10.1051/0004-6361/201014029. Retrieved 9 December 2016.
    8. 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 9 December 2016.
    9. "1947 Iso-Heikkila (1935 EA)". Minor Planet Center. 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. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 December 2016.

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