![]() Modelled shape of Naef from its lightcurve | |
Discovery[1] | |
---|---|
Discovered by | P. Wild |
Discovery site | Zimmerwald Obs. |
Discovery date | 5 September 1972 |
Designations | |
(1906) Naef | |
Named after | Robert A. Naef (amateur astronomer)[2] |
1972 RC · 1943 VF 1952 DG1 · 1965 WF | |
main-belt · Vestoid[3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 51.33 yr (18,749 days) |
Aphelion | 2.6944 AU |
Perihelion | 2.0517 AU |
2.3731 AU | |
Eccentricity | 0.1354 |
3.66 yr (1,335 days) | |
94.839° | |
0° 16m 10.56s / day | |
Inclination | 6.4757° |
354.84° | |
14.485° | |
Physical characteristics | |
Dimensions | 6.64 km (calculated)[3] 7.923±0.090[4] 8.057±0.083 km[5] |
11.00818±0.00001 h[6] 11.009±0.0012 h[a] 11.0090±0.0002 h[7] 11.03±0.02 h[8] | |
0.2282±0.0466[5] 0.234±0.052[4] 0.4 (assumed)[3] | |
SQ[9] · V[3] | |
12.5[1][3] · 12.7[5] · 13.36±0.31[9] | |
1906 Naef (prov. designation:1972 RC) is a stony vestoid asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 5 September 1972, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland.[10] It was later named after Swiss banker and amateur astronomer Robert A. Naef.[2]
Orbit and classification
[edit]Naef orbits the Sun in the inner main-belt at a distance of 2.1–2.7 AU once every 3 years and 8 months (1,335 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Zimmerwald, as previous observation at Turku Observatory (1943 VF) and McDonald Observatory (1952 DG1) in 1943 and 1952, respectively, remain unused.[10]
Physical characteristics
[edit]According to observations by the Wide-field Infrared Survey Explorer's NEOWISE mission, Naef measures 7.9 and 8.1 kilometers in diameter, and its surface has an albedo of 0.23,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.40 and calculates a diameter of 6.6 kilometer with an absolute magnitude of 12.5.[3]
Naef is a vestoid or V-type asteroid, with its spectral type comparable to that of the group's namesake, 4 Vesta. V-type asteroids are less common than the abundant S-type asteroids, but they are similar in their stony composition, except for their higher concentration of pyroxenes, an aluminium-rich silicate mineral. PanSTARRS' photometric survey has characterized it as a SQ-type that transitions to the Q-type asteroids.[9]
Four rotational lightcurves, obtained during 2005–2009, gave a well-defined rotation period between 11.01 and 11.03 hours, and a brightness variation of 0.92–0.95 magnitude (U=n.a./3/n.a./2+).[6][7][8][a]
Naming
[edit]This minor planet was named after Swiss banker Robert A. Naef (1907–1975) from Zürich, an ardent amateur astronomer, who produced the yearly observers almanac, Der Sternenhimmel, since 1940.[2] The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4157).[11]
Notes
[edit]- ^ a b Pravec (2005) web: rotation period 11.009±0.0012 hours with a brightness amplitude of 0.92 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1906) Naef
References
[edit]- ^ a b c d "JPL Small-Body Database Browser: 1906 Naef (1972 RC)" (2017-03-21 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2017.
- ^ a b c Schmadel, Lutz D. (2007). "(1906) Naef". Dictionary of Minor Planet Names – (1906) Naef. Springer Berlin Heidelberg. p. 153. doi:10.1007/978-3-540-29925-7_1907. ISBN 978-3-540-00238-3.
- ^ a b c d e f "LCDB Data for (1906) Naef". Asteroid Lightcurve Database (LCDB). Retrieved 11 December 2016.
- ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 11 December 2016.
- ^ 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.
- ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 11 December 2016.
- ^ a b Durkee, Russell I.; Pravec, Petr (June 2007). "The Lightcurve of Asteroid 1906 NAEF". The Minor Planet Bulletin. 34 (2): 49. Bibcode:2007MPBu...34...49D. ISSN 1052-8091. Retrieved 11 December 2016.
- ^ a b Polishook, David (April 2010). "Lightcurves and Spin Periods from the Wise Observatory - 2009". The Minor Planet Bulletin. 37 (2): 65–69. Bibcode:2010MPBu...37...65P. ISSN 1052-8091. Retrieved 11 December 2016.
- ^ a b c 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. Retrieved 11 December 2016.
- ^ a b "1906 Naef (1972 RC)". Minor Planet Center. Retrieved 11 December 2016.
- ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
External links
[edit]- The Robert A. Naef Foundation
- 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 (1)-(5000) – Minor Planet Center
- 1906 Naef at AstDyS-2, Asteroids—Dynamic Site
- 1906 Naef at the JPL Small-Body Database