_Carelia.png) Modelled shape ofCarelia from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 16 February 1936 |
| Designations | |
| (1391) Carelia | |
| Pronunciation | /kəˈriːliə/[2] |
Named after | Karelia (European region)[3] |
| 1936 DA · 1949 MR | |
| Orbital characteristics[4] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 83.97yr (30,670 d) |
| Aphelion | 2.9677AU |
| Perihelion | 2.1278 AU |
| 2.5478 AU | |
| Eccentricity | 0.1648 |
| 4.07 yr (1,485 d) | |
| 228.13° | |
| 0° 14m 32.64s / day | |
| Inclination | 7.5962° |
| 103.33° | |
| 85.875° | |
| Physical characteristics | |
| 11.079±0.111 km[7] | |
| 5.87822±0.00001 h[8] | |
| 0.214±0.021[7] | |
| 11.8[1][4] | |
1391 Carelia (prov. designation:1936 DA) is a stonybackground asteroid from the central region of theasteroid belt. It was discovered on 16 February 1936, by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland.[1] TheS-type asteroid has arotation period of 5.9 hours and measures approximately 11 kilometers (6.8 miles) in diameter. It was named for the Northeast European region ofKarelia.[3]
Carelia is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[5][6] It orbits the Sun in thecentral main-belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,485 days;semi-major axis of 2.55 AU). Its orbit has aneccentricity of 0.16 and aninclination of 8° with respect to theecliptic.[4] It was first observed atHeidelberg Observatory, extending the body'sobservation arc by 2 days prior to its official discovery observation at Turku.[1]
Thisminor planet was named after the northeastern European region ofKarelia, located between the Gulf of Finland and the Russian White Sea. Thenaming was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 126).[3] Since theWinter War between the Soviet Union and Finland in 1939–40, most of the regions belongs now to Russia. A large part ofYrjö Väisälä's discoveries have names that are in some form or another related to that war about Karelia.
In theTholen taxonomy,Carelia is a stonyS-type asteroid, the most common type in the inner main-belt.[4] The asteroid is also an S-type in theSDSS-based taxonomy.[9]
In 2016, a rotationallightcurve ofCarelia was published using modeledphotometric data from the Lowell Photometric Database (LPD). Lightcurve analysis gave arotation period of5.87822±0.00001 hours (U=n.a.), as well as twospin axes at (21.0°, −79.0°) and (208.0°, −43.0°) inecliptic coordinates (λ, β).[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Carelia measures 11.079 and 11.570 kilometers in diameter and its surface has analbedo of 0.1972 and 0.214, respectively.[7][6] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.46 kilometers based on anabsolute magnitude of 12.07.[10]
