720 Bohlinia is a minor planet, and binary asteroid[4], orbiting the Sun that was discovered by Franz Kaiser, a German astronomer in 1911. It is named for Swedish astronomer Karl Petrus Theodor Bohlin, to mark his 65th birthday.[5] He had worked on the orbits of asteroids.[6]
.png) A three-dimensional model of 720 Bohlinia based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Franz Kaiser |
| Discovery site | Heidelberg |
| Discovery date | 18 October 1911 |
| Designations | |
| 1911 MW | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 117.11 yr (42775 d) |
| Aphelion | 2.9376 AU (439.46 Gm) |
| Perihelion | 2.8371 AU (424.42 Gm) |
| 2.8873 AU (431.93 Gm) | |
| Eccentricity | 0.017406 |
| 4.91 yr (1792.0 d) | |
| 350.275° | |
| 0° 12m 3.204s / day | |
| Inclination | 2.3562° |
| 35.706° | |
| 118.762° | |
| Known satellites | 1 |
| Physical characteristics | |
| 16.865±0.7 km[1] 17.32 ± 0.905 km[2] | |
| Mass | (5.97 ± 0.80) × 1016 kg[2] |
Mean density | 2.74 ± 0.56 g/cm3[2] |
| 8.919 h (0.3716 d) | |
| 0.203[3] 0.2029±0.018[1] | |
| 9.71[3] 9.6[1] | |
It is one of the Koronis family of asteroids. A group of astronomers, including Lucy d'Escoffier Crespo da Silva and Richard P. Binzel, used observations made between 1998 through 2000 to determine the spin-vector alignment of these asteroids. The collaborative work resulted in the creation of 61 new individual rotation lightcurves to augment previous published observations.[7]
Binzel and Schelte Bus further added to the knowledge about this asteroid in a lightwave survey published in 2003. This project was known as Small Main-belt Asteroid Spectroscopic Survey, Phase II or SMASSII, which built on a previous survey of the main-belt asteroids. The visible-wavelength (0.435-0.925 micrometre) spectra data was gathered between August 1993 and March 1999.[8]
Orbit
editThis object is orbiting the Sun with a semi-major axis of 2.89 AU with a low eccentricity of 0.017, which is carrying it to a distance of 2.94 to 2.94 during each 4.91 year orbital period. The orbital plane is inclined at an angle of 2.36° relative to the plane of the ecliptic. Based on infrared measurements, it has a diameter of 33.73±1.4 km. The spectrum matches a stony S-type asteroid.[1]
Satellite
editOn 4 September 2025, a team of astronomers at the Pulkovo Observatory, consisting of Denis. L. Gorshanov, Iriada. R. Sokova, Svetlana. N. Petrova, Konstantin. N. Naumov, and Amir. Kh. Aliev discovered one natural satellite orbiting Bohlinia using lightcurve observations. It has been calculated that the orbital period of the satellite is roughly 17.4 hours, with a diameter of 1.75 ± 0.8 km. The announcement of the discovery was made on 21 November 2025, and the satellite currently does not a designation or name.[4][9]
References
edit- 1 2 3 4 5 "720 Bohlinia (1911 MW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
- 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- 1 2 Delbo', Marco; Tanga, Paolo (February 2009), "Thermal inertia of main belt asteroids smaller than 100 km from IRAS data", Planetary and Space Science, 57 (2): 259–265, arXiv:0808.0869, Bibcode:2009P&SS...57..259D, doi:10.1016/j.pss.2008.06.015, S2CID 14517561.
- 1 2 "(720) Bohlinia". www.johnstonsarchive.net. Retrieved 3 May 2026.
- ↑ "Small-Body Database Lookup".
- ↑ Hockey, Thomas (2009). The Biographical Encyclopedia of Astronomers. Springer Publishing. ISBN 978-0-387-31022-0. Retrieved 22 August 2012.
- ↑ Slivan, S. M.; et al. (2003), "Spin vectors in the Koronis family: comprehensive results from two independent analyses of 213 rotation lightcurves", Icarus, 162: 285–307, Bibcode:2003Icar..162..285S, doi:10.1016/S0019-1035(03)00029-0.
- ↑ Bus, S.; Binzel, R. P. (2003), Small Main-belt Asteroid Spectroscopic Survey, Phase II, NASA Planetary Data System, EAR-A-I0028-4-SBN0001/SMASSII-V1.0.
- ↑ Gorshanov, Denis L.; Sokova, Iraida A.; Petrova, Svetlana N.; Naumov, Konstantin N.; Aliev, Amir Kh (December 2025). "Testing the binarity of asteroid (720) Bohlinia using lightcurve analysis". Planetary and Space Science. 269 106217. doi:10.1016/j.pss.2025.106217. ISSN 0032-0633.
External links
edit- 720 Bohlinia at AstDyS-2, Asteroids—Dynamic Site
- 720 Bohlinia at the JPL Small-Body Database
