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5176 Yoichi

Asteroid

5176 Yoichi
Discovery^[1]
Discovered by	S. Ueda H. Kaneda
Discovery site	Kushiro Obs.
Discovery date	4 January 1989
Designations
MPC designation	(5176) Yoichi
Named after	Yoichi^[1] (Japanese town)
Alternative designations	1989 AU · 1935 YH 1948 VS · 1948 WS 1952 OH₁ · 1961 TK₁
Minor planet category	main-belt^[1]^[2] · (middle) background^[3]
Orbital characteristics^[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	81.52 yr (29,777 d)
Aphelion	3.5198 AU
Perihelion	1.8546 AU
Semi-major axis	2.6872 AU
Eccentricity	0.3098
Orbital period (sidereal)	4.41 yr (1,609 d)
Mean anomaly	295.85°
Mean motion	0° 13^m 25.32^s / day
Inclination	7.7043°
Longitude of ascending node	93.615°
Argument of perihelion	269.81°
Physical characteristics
Mean diameter	15.68±1.57 km^[4] 16.54 km (derived)^[5] 16.56±0.7 km^[6] 16.74±4.79 km^[7] 18.92±5.20 km^[8] 19.49±1.15 km^[9]
Geometric albedo	0.05±0.03^[7] 0.054±0.048^[8] 0.06±0.03^[4] 0.061±0.008^[9] 0.0777 (derived)^[5] 0.0849±0.007^[6]
Spectral type	S (assumed)^[5]
Absolute magnitude (H)	12.20^[7]^[9] 12.3^[2]^[5] 12.36±0.26^[10] 12.40^[8] 12.57^[4]

5176 Yoichi (provisional designation 1989 AU) is a background asteroid from the central regions of the asteroid belt, approximately 17 kilometers (11 miles) in diameter. It was discovered on 4 January 1989 by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaido, Japan.^[1] The likely elongated asteroid has a brightness variation of 0.45 magnitude^[11] and occulted a star in the constellation Cetus in November 2014.^[12] It was named for the Japanese town of Yoichi.^[1]

Orbit and classification

Yoichi is a non-family asteroid from the main belt's background population.^[3] It orbits the Sun in the central main-belt at a distance of 1.9–3.5 AU once every 4 years and 5 months (1,609 days; semi-major axis of 2.69 AU). Its orbit has an eccentricity of 0.31 and an inclination of 8° concerning the ecliptic.^[2]

The body's observation arc begins with its first observations as 1935 YH at Johannesburg Observatory in December 1935, or 53 years before its official discovery observation at Kushiro.^[1]

Physical characteristics

Yoichi is an assumed S-type asteroid, while the body's albedo indicates a carbonaceous C-type asteroid (see below).^[5]

Rotation period

In November 2015, astronomers took photometric data of Yoichi at the Oakley Southern Sky Observatory in Australia. However, no rotational lightcurve could be constructed. The asteroid's brightness amplitude was 0.42 magnitude (U=n.a.), indicative of an elongated shape.^[11] As of 2018, the body's rotation period, pole, and shape remain unknown.^[5]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Yoichi measures between 15.68 and 19.49 kilometers in diameter, and its surface has an albedo between 0.05 and 0.0849.^[4]^[6]^[7]^[8]^[9]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0777 and a diameter of 16.54 kilometers based on an absolute magnitude of 12.3.^[5]

Occultation

On 2 November 2014, Yoichi occulted an 8.4 magnitude star HIP 14421 in the constellation Cetus, causing a magnitude drop from 8.4 to 14.1 during 2.8 seconds. The occultation was visible over Southern Japan, Eastern China, and Southern California to North Florida. The asteroid's 23-kilometer-wide shadow had a speed of approximately 6.8 km/s. An approximate diameter of 20 kilometers was assumed for the asteroid.^[12]

Naming

This minor planet was named after the Japanese town of Yoichi, Hokkaido, where the Kushiro Observatory was discovered.^[1] The Minor Planet Center published the official naming citation on 4 August 2001 (M.P.C. 43189).^[13]

References

1 2 3 4 5 6 7 "5176 Yoichi (1989 AU)". Minor Planet Center. Retrieved 25 April 2018.
1 2 3 4 "JPL Small-Body Database Browser: 5176 Yoichi (1989 AU)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 25 April 2018.
1 2 "Asteroid 5176 Yoichi – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
1 2 3 4 5 6 7 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Retrieved 25 April 2018. Search using Number = "5176"
1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.
1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. S2CID 46350317.
1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
↑ 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. S2CID 53493339.
1 2 Hess, Kylie; Ditteon, Richard (April 2016). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2014 November". The Minor Planet Bulletin. 43 (2): 120. Bibcode:2016MPBu...43..120H. ISSN 1052-8091.
1 2 Preston, Steve. "(5176) Yoichi / HIP 14421 event on 2014 Nov 02, 10:58 UT". asteroidoccultation.com. Retrieved 25 April 2018. (Summary)
↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 April 2018.

External links

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 (5001)-(10000) – Minor Planet Center
5176 Yoichi at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
5176 Yoichi at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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