1478 Vihuri

1478 Vihuri, provisional designation 1938 CF, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 6 February 1938, by Finnish Yrjö Väisälä at Turku Observatory in Southwest Finland.^[8] The asteroid was named after a Finnish philanthropist by the name of A. Vihuri.^[2]

1478 Vihuri

Discovery[1]
Discovered by	Y. Väisälä
Discovery site	Turku Obs.
Discovery date	6 February 1938
Designations
MPC designation	(1478) Vihuri
Named after	A. Vihuri (philanthropist)[2]
Alternative designations	1938 CF · 1934 CG
Minor planet category	main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	110.54 yr (40,374 days)
Aphelion	2.6885 AU
Perihelion	2.2439 AU
Semi-major axis	2.4662 AU
Eccentricity	0.0901
Orbital period (sidereal)	3.87 yr (1,415 days)
Mean anomaly	216.50°
Mean motion	0° 15m 16.2s / day
Inclination	7.8326°
Longitude of ascending node	318.57°
Argument of perihelion	161.04°
Physical characteristics
Dimensions	8.45 km (derived)[3] 9.52±1.30 km[4] 11.19±0.79 km[5]
Synodic rotation period	19.5 h[6]
Geometric albedo	0.126±0.068[4] 0.127±0.019[5] 0.20 (assumed)[3]
Spectral type	S[3] B–V = 0.840[1] U–B = 0.570[1]
Absolute magnitude (H)	12.44±0.44[7] · 12.63[1][5] · 12.73[3][6] · 12.97[4]

Orbit and classification

Vihuri orbits the Sun in the inner main-belt at a distance of 2.2–2.7 AU once every 3 years and 10 months (1,415 days). Its orbit has an eccentricity of 0.09 and an inclination of 8° with respect to the ecliptic.0^[1] The asteroid's observation arc begins 11 days prior to its official discovery observation. A precovery taken at Lowell Observatory in 1906, as well as identification 1934 CG made at Uccle in 1934, remained unused.^[8]

Physical characteristics

Rotation period

In December 1983, a rotational lightcurve was obtained form photometric observations by American astronomer Richard P. Binzel. Analysis of the provisional lightcurve gave a rotation period of 19.5 hours with a brightness variation of 0.23 magnitude (U=1).^[6] As of 2017, no additional lightcurves of Vihuri have been obtained.^[3]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Vihuri measures 9.52 and 11.19 kilometers in diameter, and its surface has an albedo of 0.126 and 0.127, respectively.^[4][5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony S-type asteroid of 0.20 and calculates a diameter of 8.45 kilometers with an absolute magnitude of 12.73.^[3]

Naming

This minor planet was named for Finnish philanthropist A. Vihuri, a ship owner and supporter of science and arts.^[2] The official naming citation was published by the Minor Planet Center on 15 July 1968 (M.P.C. 2882).^[9]

References

1. "JPL Small-Body Database Browser: 1478 Vihuri (1938 CF)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 25 July 2017.
2. Schmadel, Lutz D. (2007). "(1478) Vihuri". Dictionary of Minor Planet Names – (1478) Vihuri. Springer Berlin Heidelberg. p. 118. doi:10.1007/978-3-540-29925-7_1479. ISBN 978-3-540-00238-3.
3. "LCDB Data for (1478) Vihuri". Asteroid Lightcurve Database (LCDB). Retrieved 16 December 2016.
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. Retrieved 16 December 2016.
5. 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)
6. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 16 December 2016.
7. 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 16 December 2016.
8. "1478 Vihuri (1938 CF)". Minor Planet Center. Retrieved 16 December 2016.
9. Schmadel, Lutz D. "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

• 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
• 1478 Vihuri at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1478 Vihuri at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters