1532 Inari

1532 Inari, provisional designation 1938 SM, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 28 kilometers in diameter. Discovered by Yrjö Väisälä at Turku Observatory in 1938, it was later named for Lake Inari in northern Finland.[2]

1532 Inari
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date16 September 1938
Designations
(1532) Inari
Named after
Lake Inari (Finnish lake)[2]
1938 SM · 1933 SZ
1935 BJ · 1936 FP1
main-belt · (outer)
Eos [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc80.74 yr (29,492 days)
Aphelion3.1618 AU
Perihelion2.8486 AU
3.0052 AU
Eccentricity0.0521
5.21 yr (1,903 days)
325.80°
0° 11m 21.12s / day
Inclination8.7769°
330.63°
122.85°
Physical characteristics
Dimensions24.439±0.056 km[5]
26.759±0.099 km[6]
28.38 km (derived)[3]
29.53±0.56 km[7]
30.39±3.24 km[8]
25 h[9]
0.060±0.003[7]
0.0623±0.0080[6]
0.078±0.011[5]
0.087±0.039[8]
0.1049 (derived)[3]
Tholen = S [1][3]
B–V = 0.840 [1]
U–B = 0.360 [1]
10.8[1][3] · 10.86[8] · 11.50[6][7]

    Discovery

    Inari was discovered on 16 September 1938, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland.[10] The asteroid was first identified as 1933 SZ at Simeiz Observatory in September 1933, and its observation arc begins at Nice Observatory in April 1936, more than two years prior to its official discovery observation at Turku.[10]

    Orbit and classification

    Inari is a member the Eos family (606),[4] one of the asteroid belt's largest families with nearly 10,000 known asteroids.[11]:23 It orbits the Sun in the outer main belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,903 days). Its orbit has an eccentricity of 0.05 and an inclination of 9° with respect to the ecliptic.[1]

    Physical characteristics

    In the Tholen classification, Saimaa is a featureless stony S-type asteroid.[1][3] The overall spectral type for members of the Eos family is that of a K-type.[11]:23

    Rotation period

    In January 2008, a fragmentary rotational lightcurve of Inari was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a longer-than-average rotation period of 25 hours with a low brightness amplitude of 0.09 magnitude (U=1+).[9] As of 2017, no secure period has been obtained.[3]

    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, Inari measures between 24.439 and 30.39 kilometers in diameter and its surface has an albedo between 0.060 and 0.087.[5][6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1049 and a diameter of 28.38 kilometers based on an absolute magnitude of 10.8.[3]

    Naming

    This minor planet was named after Lake Inari (Inarijärvi), located north of the Arctic Circle in Lapland, Finland. Lake Inari is the country's third-largest lake and one of the largest lakes in Europe.[2]

    The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3929).[12]

    References
    1. "JPL Small-Body Database Browser: 1532 Inari (1938 SM)" (2017-01-09 last obs.). Jet Propulsion Laboratory. Retrieved 9 October 2017.
    2. Schmadel, Lutz D. (2007). "(1532) Inari". Dictionary of Minor Planet Names – (1532) Inari. Springer Berlin Heidelberg. p. 121. doi:10.1007/978-3-540-29925-7_1533. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1532) Inari". Asteroid Lightcurve Database (LCDB). Retrieved 9 October 2017.
    4. "Asteroid 1532 Inari – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 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 9 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.
    7. 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. 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 October 2017.
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (1532) Inari". Geneva Observatory. Retrieved 9 October 2017.
    10. "1532 Inari (1938 SM)". Minor Planet Center. Retrieved 9 October 2017.
    11. 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.
    12. 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. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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