5331 Erimomisaki, provisional designation 1990 BT1, is a background asteroid on an eccentric orbit from the central regions of the asteroid belt, approximately 10 kilometers (6 miles) in diameter. It was discovered on 27 January 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on Hokkaidō, Japan.[1] The asteroid has a longer-than-average rotation period of 24.26 hours.[8] It was named after Cape Erimo at the southern tip of Hokkaidō.[1]
| Discovery [1] | |
|---|---|
| Discovered by | Kin Endate K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 27 January 1990 |
| Designations | |
| (5331) Erimomisaki | |
Named after | Cape Erimo [1] (Hokkaidō, Japan) |
| 1990 BT1 · 1984 YY2 | |
| main-belt [1][2] · (middle) background [3] | |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 33.33 yr (12,174 d) |
| Aphelion | 3.8450 AU |
| Perihelion | 1.6826 AU |
| 2.7638 AU | |
| Eccentricity | 0.3912 |
| 4.59 yr (1,678 d) | |
| 102.26° | |
| 0° 12m 52.2s / day | |
| Inclination | 12.099° |
| 109.79° | |
| 283.14° | |
| Physical characteristics | |
| 9.208±0.323 km[4][5] 9.549±2.062 km[6] 10.57±0.15 km[7] 16.81 km (calculated)[8] | |
| 24.233±0.004 h[9] 24.26±0.02 h[10] | |
| 0.057 (assumed)[8] 0.2018±0.0967[6] 0.202±0.035[4] 0.2284±0.0416[5] 0.253±0.009[7] | |
| C (assumed)[8] | |
| 12.00[7] 12.4[5] 12.5[2] 12.60[6][8] 13.19±0.14[11] | |
Orbit and classification
editErimomisaki is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the central main-belt at a distance of 1.7–3.8 AU once every 4 years and 7 months (1,678 days; semi-major axis of 2.76 AU). Its orbit has a relatively high eccentricity of 0.39 and an inclination of 12° with respect to the ecliptic.[2]
The body's observation arc begins with its first observation as 1984 YY2 at Crimea–Nauchnij in December 1984, more than 5 years prior to its official discovery observation at Kitami.[1]
Physical characteristics
editErimomisaki's spectral type is unknown.[3] The Collaborative Asteroid Lightcurve Link (CALL) generically assumes it to be a carbonaceous C-type asteroid (as its semi-major axis is larger than 2.7 AU).[8] However, based on the body's albedo (see below), it is rather a stony S-type asteroid.
Rotation period
editIn December 2007, two rotational lightcurve of Erimomisaki were obtained from photometric observations by international collaboration between astronomers Silvano Casulli, Russel Durkee, Caleb Boe, Fiona Vincent and David Higgins.[9][10] Lightcurve analysis gave a longer-than-average rotation period of 24.233 and 24.26 hours with a brightness amplitude of 0.42 and 0.27 magnitude, respectively (U=2/3-). CALL adopts the longer period as its best result.[8] While not being a slow rotator, Erimomisaki's period is longer than that of most other asteroids, which have spin rates between 2 and 20 hours.
Diameter and albedo
editAccording to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Erimomisaki measures between 9.208 and 10.57 kilometers in diameter and its surface has an albedo between 0.2018 and 0.253.[4][5][6][7] CALL generically assumes a carbonaceous albedo of 0.057 and consequently calculates a much larger diameter of 16.81 kilometers based on an absolute magnitude of 12.6.[8]
Naming
editThis minor planet was named after Cape Erimo (Japanese: Erimo-misaki) at the south end of Hokkaidō, Japan. The official naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22508).[12]
References
edit- ^ a b c d e f "5331 Erimomisaki (1990 BT1)". Minor Planet Center. Retrieved 15 May 2018.
- ^ a b c d "JPL Small-Body Database Browser: 5331 Erimomisaki (1990 BT1)" (2018-04-23 last obs.). Jet Propulsion Laboratory. Retrieved 15 May 2018.
- ^ a b c "Asteroid 5331 Erimomisaki". Small Bodies Data Ferret. Retrieved 15 May 2018.
- ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.
- ^ a b c d 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. S2CID 35447010. (catalog)
- ^ a b c d Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017). "NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos". The Astronomical Journal. 154 (4): 10. arXiv:1708.09504. Bibcode:2017AJ....154..168M. doi:10.3847/1538-3881/aa89ec. S2CID 250780308.
- ^ a b c d 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. (online, AcuA catalog p. 153)
- ^ a b c d e f g h "LCDB Data for (5331) Erimomisaki". Asteroid Lightcurve Database (LCDB). Retrieved 15 May 2018.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (5331) Erimomisaki". Geneva Observatory. Retrieved 15 May 2018.
- ^ a b Boe, Caleb; Durkee, Russell I.; Casulli, Silvano; Vincent, Fiona; Higgins, David (October 2008). "The Lightcurve of Asteroid 5331 Erimomisaki". The Minor Planet Bulletin. 35 (4): 143. Bibcode:2008MPBu...35..143B. ISSN 1052-8091.
- ^ 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. S2CID 53493339.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 May 2018.
External links
edit- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5331 Erimomisaki at AstDyS-2, Asteroids—Dynamic Site
- 5331 Erimomisaki at the JPL Small-Body Database