1266 Tone

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1266 Tone
Discovery [1]
Discovered by O. Oikawa
Discovery site Tokyo Obs. (389)
Discovery date 23 January 1927
MPC designation (1266) Tone
Named after
Tone River[2]
(Japanese river)
1927 BD · 1933 BM
1934 EC · A899 PH
main-belt · (outer)[1][3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 84.76 yr (30,958 days)
Aphelion 3.5313 AU
Perihelion 3.1886 AU
3.3600 AU
Eccentricity 0.0510
6.16 yr (2,250 days)
0° 9m 36s / day
Inclination 17.182°
Physical characteristics
Dimensions 70.70±24.76 km[5]
73.34±3.8 km[6]
75.470±0.523 km[7]
83.261±2.040 km[8]
88.82±1.33 km[9]
94.10±24.67 km[10]
7.40±0.05 h[11][a]
11.82±0.05 h[12]
12.9±0.1 h[13]
Tholen = P [1][3]
B–V = 0.732[1]
U–B = 0.317[1]
9.40[10] · 9.41[1][3][5][6][8][9]

1266 Tone, provisional designation 1927 BD, is a dark background asteroid from the outer regions of the asteroid belt, approximately 80 kilometers in diameter. Discovered by astronomer Okuro Oikawa at the Tokyo Observatory in 1927,[14] the asteroid was later named after the Tone River, one of Japan's largest rivers.[2]


It was discovered by Japanese astronomer Okuro Oikawa at the Tokyo Observatory (389) on 23 January 1927.[14] On the following night, it was independently discovered by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[2] The Minor Planet Center only recognizes the first discoverer.[14] In August 1899, the asteroid was first identified as A899 PH at the Boyden Station of the Harvard Observatory in Arequipa, Peru.[14]

Orbit and classification[edit]

Tone is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 3.2–3.5 AU once every 6 years and 2 months (2,250 days; semi-major axis of 3.36 AU). Its orbit has an eccentricity of 0.05 and an inclination of 17° with respect to the ecliptic.[1]

The body's observation arc begins with its identification as 1933 BM at the German Heidelberg Observatory in January 1933, or four years after its official discovery observation at Tokyo.[14]

Physical characteristics[edit]

In the Tholen classification, Tone is a primitive and dark P-type asteroid.[1][3]

Rotation period[edit]

In October 1999, two rotational lightcurves of Tone were obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave two divergent rotation periods of 7.40 and 11.82 hours with a brightness variation of 0.06 and 0.12 magnitude, respectively (U=2/2).[11][12][a] Observation by Italian astronomers Roberto Crippa and Federico Manzini in October 2005, gave another tentative period of 12.9 hours and an amplitude of 0.07 magnitude (U=2-).[13] The LCDB currently adopts a period of 7.40 hours.[3]

Diameter and albedo[edit]

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, Tone measures between 70.70 and 94.10 kilometers in diameter and its surface has an albedo between 0.039 and 0.0566.[5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0566 and a diameter of 73.34 kilometers based on an absolute magnitude of 9.41.[3]


This minor planet was named after Tone River (Tone-gawa), Japan's second-largest river after the Shinano River.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116).


  1. ^ a b Lightcurve plot of 1266 Tone, Palmer Divide Observatory, B. D. Warner (1999). Summary figures at the LCDB


  1. ^ a b c d e f g h i "JPL Small-Body Database Browser: 1266 Tone (1927 BD)" (2017-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 14 November 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1266) Tone. Springer Berlin Heidelberg. p. 105. ISBN 978-3-540-00238-3. Retrieved 14 November 2017. 
  3. ^ a b c d e f "LCDB Data for (1266) Tone". Asteroid Lightcurve Database (LCDB). Retrieved 14 November 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 14 November 2017. 
  5. ^ a b c d 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 14 November 2017. 
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Archived from the original on 2016-06-03. Retrieved 14 November 2017. 
  7. ^ 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 14 November 2017. 
  8. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 14 November 2017. 
  9. ^ a b c d 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. Retrieved 14 November 2017. 
  10. ^ a b c d 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 14 November 2017. 
  11. ^ a b Warner, Brian D. (July 2010). "Upon Further Review: I. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 37 (3): 127–130. Bibcode:2010MPBu...37..127W. ISSN 1052-8091. Retrieved 14 November 2017. 
  12. ^ a b Warner, Brian D. (September 2003). "Lightcurve analysis of asteroids 331, 795, 886, 1266, 2023, 3285, and 3431". The Minor Planet Bulletin. 30 (3): 61–64. Bibcode:2003MPBu...30...61W. ISSN 1052-8091. Retrieved 14 November 2017. 
  13. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1266) Tone". Geneva Observatory. Retrieved 14 November 2017. 
  14. ^ a b c d e "1266 Tone (1927 BD)". Minor Planet Center. Retrieved 14 November 2017. 

External links[edit]