4951 Iwamoto
| Discovery V–R = 0.480±0.030[b] | |
|---|---|
| 13.3[1] · 13.74±0.06[3][7][b] · 13.74[6] · 14.01±1.40[9] | |
4951 Iwamoto, provisional designation 1990 BM, is a stony, synchronous binary[a] asteroid and slow rotator from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 21 January 1990, by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at Kani Observatory (403) in Japan.[10]
Orbit
Sun · Earth · Mars · 4951 Iwamoto
Iwamoto orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,239 days). Its orbit has an eccentricity of 0.17 and an inclination of 8° with respect to the ecliptic.[1] It was first identified as 1931 UQ at Lowell Observatory in 1931, extending the body's observation arc by 59 years prior to its official discovery observation at Kani.[10]
Physical characteristics
In the
Diameter and albedo
According to the survey carried out by NASA's
Slow rotator
From 25 December 2006 to 23 March 2007, photometric observations of Iwamoto were obtained by the international community of photometrists at Badlands Observatory (SD, USA),
Lightcurve analysis gave a
Binary system
During the photometric observations in 2006/7, it was revealed that Iwamoto ("primary") is a synchronous
Naming
This
Notes
- ^ a b c Central Bureau for Astronomical Telegrams
IAUC 8836 – (4951) Iwamoto
Photometric observations from 25 December 2006 to 23 March 2007, revealed that (4951) Iwamoto is a synchronous binary asteroid with a rotation period of 118.0±0.2 hours. The combined rotational lightcurve has a brightness variation of 0.34 magnitude. Superimposed mutual occultation/eclipsing events indicate a lower Ds/Dp limit of 0.76. It has an estimated mean abs. magnitude of 13.26±0.05 (Cousins R system), and a measured V–R color index of 0.48±0.03, giving an absolute visual magnitude of 13.74±0.06. This gives a mean-diameter of 4.0 and 3.5 kilometers (± 20%) for the primary and secondary, respectively, assuming a geometric visual albedo of 0.20±0.07 the S-type classified body in the SMASS II taxonomy. The system's parameters are extraordinary in comparison with other known small binaries, in terms of system angular momentum and evolution to its present synchronous state; thus, further observations are warranted.
Reported by:- Vishnu Reddyat the Department of Earth System Science and Policy, University of North Dakota
- Ron Dyvig, Badlands Observatory, Sorth Dakota, USA
- Petr Pravec and Peter Kušnirák at Ondřejov Observatory Czech Republic
- Jozef Világi at Modra Observatory, Slovakia
- Donald Pray, Carbuncle Hill Observatory, Rhode Island, USA
- John Grossand Dirk Terrell at Sonoita Research Observatory (G94), Arizona, USA
- Yuri N. Krugly, Kharkiv Observatory, Ukraine
- Judit Györgyey Ries, McDonald Observatory, Texas, USA
- Ken Archer, Ironwood Observatory, Hawaii, USA
- Julian Oey, Leura Observatory, Australia
- Michal Pikler and Marek Husarik, Skalnaté pleso Observatory, Slovakia
- Russell Durkee, Shed of Science Observatory (H39), Minneapolis, USA
- Pic du Midi Observatory, France
- Alan W. Harris, Space Science Institute in La Canada, California, USA
- ^ a b c d e Pravec (2007) web: rotation period 118.0±0.2 hours with a brightness amplitude of 0.34 mag. Quality code = 3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2007)
References
- ^ a b c d e f "JPL Small-Body Database Browser: 4951 Iwamoto (1990 BM)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
- ^ ISBN 978-3-540-00238-3.
- ^ a b c d e "LCDB Data for (4951) Iwamoto". Asteroid Lightcurve Database (LCDB). Retrieved 29 March 2017.
- ^ a b c Johnston, Robert (21 September 2014). "(4951) Iwamoto". johnstonsarchive.net. Retrieved 29 March 2017.
- ^ . Retrieved 29 March 2017.
- ^ .
- ^ . Retrieved 29 March 2017.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (4951) Iwamoto". Geneva Observatory. Retrieved 29 March 2017.
- . Retrieved 29 March 2017.
- ^ a b "4951 Iwamoto (1990 BM)". Minor Planet Center. Retrieved 29 March 2017.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 March 2017.
External links
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- 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
- 4951 Iwamoto at AstDyS-2, Asteroids—Dynamic Site
- 4951 Iwamoto at the JPL Small-Body Database
