Astronomy:4185 Phystech
| Discovery [1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 4 March 1975 |
| Designations | |
| (4185) Phystech | |
| Named after | Moscow Institute of Physics and Technology [1] |
| 1975 ED · 1982 KD 1982 KH4 · 1988 BT | |
| Minor planet category | main-belt [1][2] · (inner) background [3][4] · Flora [5] |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.48 yr (23,550 d) |
| |{{{apsis}}}|helion}} | 2.4339 AU |
| |{{{apsis}}}|helion}} | 2.0008 AU |
| 2.2174 AU | |
| Eccentricity | 0.0977 |
| Orbital period | 3.30 yr (1,206 d) |
| Mean anomaly | 311.69° |
| Mean motion | 0° 17m 54.6s / day |
| Inclination | 2.2303° |
| Longitude of ascending node | 265.78° |
| 320.99° | |
| Physical characteristics | |
| Mean diameter | 5.93 km (calculated)[5] |
| Rotation period | 4.66883±0.00014 h[6] 4.66904±0.00003 h[6] |
| Geometric albedo | 0.24 (assumed)[5] |
| S (assumed)[5] | |
| Absolute magnitude (H) | 13.3[2][5] |
4185 Phystech, provisional designation 1975 ED, is a Florian or background asteroid from the inner regions of the asteroid belt, approximately 6 kilometers (4 miles) in diameter. It was discovered on 4 March 1975, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[1] The presumed S-type asteroid has a rotation period of 4.67 hours. It is named in honor of the Moscow Institute of Physics and Technology ("PhysTech") on its 50th anniversary.[1]
Orbit and classification
Phystech is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[5]
It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,206 days; semi-major axis of 2.22 AU). Its orbit has an eccentricity of 0.10 and an inclination of 2° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in October 1953, more than 21 years prior to its official discovery observation at Nauchnij.[1]
Physical characteristics
Phystech is an assumed stony S-type asteroid, based on its family classification.[5]
Rotation period
In March and April 2008, two rotational lightcurves of Phystech were obtained from photometric observations by American astronomers at LPL and Calvin College (H62). Lightcurve analysis gave a well-defined rotation period of 4.66883 and 4.66904 hours with a brightness amplitude of 0.53 and 0.41 magnitude, respectively ({{{1}}}).[6]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 5.93 kilometers based on an absolute magnitude of 13.3.[5]
Naming
This minor planet was named after the Moscow Institute of Physics and Technology (informally: "PhysTech"; Физтех) on the occasion of its 50th anniversary in 1996, based on a proposal by the Institute of Theoretical Astronomy (ITA) in Saint Petersburg, Russia.[1] The official naming citation was published by the Minor Planet Center on 22 February 1997 (M.P.C. 29143).[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "4185 Phystech (1975 ED)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4185.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 4185 Phystech (1975 ED)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004185.
- ↑ 3.0 3.1 "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action.
- ↑ 4.0 4.1 "Asteroid 4185 Phystech – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=4185.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 "LCDB Data for (4185) Phystech". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4185%7CPhystech.
- ↑ 6.0 6.1 6.2 Dykhuis, Melissa J.; Molnar, Lawrence A.; Gates, Christopher J.; Gonzales, Joshua A.; Huffman, Jared J.; Maat, Aaron R. et al. (March 2016). "Efficient spin sense determination of Flora-region asteroids via the epoch method". Icarus 267: 174–203. doi:10.1016/j.icarus.2015.12.021. Bibcode: 2016Icar..267..174D. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..267..174D. Retrieved 27 April 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 4185 Phystech at AstDyS-2, Asteroids—Dynamic Site
- 4185 Phystech at the JPL Small-Body Database
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