Astronomy:4432 McGraw-Hill
| Discovery [1] | |
|---|---|
| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Obs. |
| Discovery date | 2 March 1981 |
| Designations | |
| (4432) McGraw-Hill | |
| Named after | McGraw-Hill Telescope [1] (at Kitt Peak, Arizona) |
| 1981 ER22 · 1964 TV | |
| Minor planet category | main-belt [1][2] · (inner)[3] background [4] |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 53.54 yr (19,555 d) |
| |{{{apsis}}}|helion}} | 2.8975 AU |
| |{{{apsis}}}|helion}} | 1.8747 AU |
| 2.3861 AU | |
| Eccentricity | 0.2143 |
| Orbital period | 3.69 yr (1,346 d) |
| Mean anomaly | 188.28° |
| Mean motion | 0° 16m 2.64s / day |
| Inclination | 0.4616° |
| Longitude of ascending node | 115.15° |
| 246.30° | |
| Physical characteristics | |
| Mean diameter | 3.042±0.643 km[5][6] 3.43 km (derived)[3] |
| Rotation period | inconclusive [3][7] |
| Geometric albedo | 0.20 (assumed)[3] 0.254±0.224[5][6] |
| S (assumed)[3] | |
| Absolute magnitude (H) | 14.5[1][2] 14.69[3][6][7] |
4432 McGraw-Hill, provisional designation 1981 ER22, is a background asteroid from the inner regions of the asteroid belt, approximately 3 kilometers (2 miles) in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in Australia. The likely S-type asteroid was named for the McGraw-Hill Telescope located at Kitt Peak, Arizona.[1]
Orbit and classification
McGraw-Hill is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,346 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.21 and an inclination of 0° with respect to the ecliptic.[2]
The asteroid was first observed as 1964 TV at Purple Mountain Observatory in October 1964. The body's observation arc begins with a precovery taken at Palomar Observatory in February 1977, or four years prior to its official discovery observation at Siding Spring.[1]
Physical characteristics
McGraw-Hill is an assumed, stony S-type asteroid,[3] in agreement with the albedo (see below) obtained by the Wide-field Infrared Survey Explorer (WISE).
Rotation period
During the Small Main-Belt Asteroid Lightcurve Survey, McGraw-Hill has been observed photometrically. The observations gave a small brightness variation of 0.06 magnitude but resulted in no useful rotational lightcurve ({{{1}}}).[7] As of 2018, the body's rotation period, pole and shape remain unknown.[2]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, McGraw-Hill measures 3.042 kilometers in diameter and its surface has an albedo of 0.254,[5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and derives a diameter of 3.43 kilometers based on an absolute magnitude of 14.69.[3]
Naming
This minor planet was named after the 1.3-meter McGraw-Hill Telescope located at the MDM Observatory at the Kitt Peak National Observatory site in Arizona, United States.[1] The official naming citation was published by the Minor Planet Center on 18 February 1992 (M.P.C. 19697).[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "4432 McGraw-Hill (1981 ER22)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4432.
- ↑ 2.0 2.1 2.2 2.3 2.4 "JPL Small-Body Database Browser: 4432 McGraw-Hill (1981 ER22)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004432.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (4432) McGraw-Hill". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4432%7CMcGraw-Hill.
- ↑ 4.0 4.1 "Asteroid 4432 McGraw-Hill". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4432+McGraw-Hill.
- ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M.
- ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. (catalog)
- ↑ 7.0 7.1 7.2 Binzel, Richard P.; Xu, Shui; Bus, Schelte J.; Bowell, Edward (September 1992). "Small Main-Belt Asteroid Lightcurve Survey". Icarus 99 (1): 225–237. doi:10.1016/0019-1035(92)90184-9. ISSN 0019-1035. Bibcode: 1992Icar...99..225B.
- ↑ "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
- 4432 McGraw-Hill at AstDyS-2, Asteroids—Dynamic Site
- 4432 McGraw-Hill at the JPL Small-Body Database
 |  |
