| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 16 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 arc | 80.74 yr (29,492 days) |
| Aphelion | 3.1618AU |
| Perihelion | 2.8486 AU |
| 3.0052 AU | |
| Eccentricity | 0.0521 |
| 5.21yr (1,903 days) | |
| 325.80° | |
| 0° 11m 21.12s / day | |
| Inclination | 8.7769° |
| 330.63° | |
| 122.85° | |
| Physical characteristics | |
| Dimensions | 24.439±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] |
| 25h[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] | |
1532 Inari (provisional designation1938 SM) is a stony Eoanasteroid from the outer regions of theasteroid belt, approximately 28 kilometers in diameter. Discovered byYrjö Väisälä atTurku Observatory in 1938, it was later named forLake Inari in northern Finland.[2]
Inari was discovered on 16 September 1938, by Finnish astronomerYrjö Väisälä at theIso-Heikkilä Observatory near Turku, Finland.[10] The asteroid was first identified as1933 SZ atSimeiz Observatory in September 1933, and itsobservation arc begins atNice Observatory in April 1936, more than two years prior to its official discovery observation at Turku.[10]
Inari is a member theEos family (606),[4] one of the asteroid belt's largestfamilies with nearly 10,000 known asteroids.[11]: 23 It orbits the Sun in theouter main belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,903 days). Its orbit has aneccentricity of 0.05 and aninclination of 9° with respect to theecliptic.[1]
In theTholen classification,Saimaa is a featureless stonyS-type asteroid.[1][3] The overallspectral type for members of the Eos family is that of aK-type.[11]: 23
In January 2008, a fragmentary rotationallightcurve of Inari was obtained from photometric observations by French amateur astronomerRené Roy. Lightcurve analysis gave a longer-than-averagerotation period of 25 hours with a low brightness amplitude of 0.09magnitude (U=1+).[9] As of 2017, no secure period has been obtained.[3]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Inari measures between 24.439 and 30.39 kilometers in diameter and its surface has analbedo between 0.060 and 0.087.[5][6][7][8] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1049 and a diameter of 28.38 kilometers based on anabsolute magnitude of 10.8.[3]
Thisminor planet was named afterLake Inari (Inarijärvi), located north of theArctic Circle inLapland, Finland. Lake Inari is the country'sthird-largest lake and one of thelargest lakes in Europe.[2]
The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3929).[12]
