3823 Yorii

3823 Yorii
Discovery [1]
Discovered byM. Arai
H. Mori
Discovery siteYorii Obs.
Discovery date10 March 1988
(3823) Yorii
Named after
Yorii (Japanese town)[2]
1988 EC1 · 1966 BS
1975 TV3 · 1977 DM4
1980 TH2 · 1982 BP8
1986 WU2
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc49.55 yr (18,098 days)
Aphelion3.8268 AU
Perihelion2.3039 AU
3.0654 AU
5.37 yr (1,960 days)
0° 11m 0.96s / day
Physical characteristics
Dimensions9.36±3.02 km[4]
10.60±2.42 km[5]
12.438±0.111 km[6][7]
13.98 km (calculated)[3]
6.669±0.005 h[8]
0.057 (assumed)[3]
12.6[6] · 12.84±0.34[9] · 13.00[1][3][5] · 13.22[4]

3823 Yorii, provisional designation 1988 EC1, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 11 kilometers in diameter.

The asteroid was discovered on 10 March 1988, by Japanese amateur astronomers Masaru Arai and Hiroshi Mori at Yorii Observatory (875) in central Japan.[10] It was named for the Japanese town of Yorii, location of the discovering observatory.[2]


Orbit and classification

Yorii orbits the Sun in the outer main-belt at a distance of 2.3–3.8 AU once every 5 years and 4 months (1,960 days). Its orbit has an eccentricity of 0.25 and an inclination of 6° with respect to the ecliptic.[1] It was first identified as 1966 BS at Purple Mountain Observatory in 1966, extending the body's observation arc by 22 years prior to its official discovery observation at Yorii.[10]

Physical characteristics

Yorii has been characterized as a carbonaceous C-type asteroid by PanSTARRS' photometric survey.[3][9]

Rotation period

In October 2013, American astronomer Brian Warner obtained a rotational lightcurve of Yorii from photometric observations taken at his Palmer Divide Observatory (716), Colorado. Lightcurve analysis gave a well-defined rotation period of 6.669 hours with a brightness variation of 0.26 magnitude (U=3).[8]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Yorii measures between 9.36 and 12.44 kilometers in diameter, and its surface has an albedo between 0.091 and 0.104.[4][5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 13.98 kilometers with an absolute magnitude of 13.00.[3]


This minor planet was named for Yorii, a Japanese town and location of the discovering Yorii Observatory. Yorii is located in the Ōsato District of the Saitama Prefecture in Japan's central Kantō region. The Dodaira Observatory of Tokyo Astronomical Observatory is also located near Yorii.[2] The official naming citation was published by the Minor Planet Center on 27 August 1988 (M.P.C. 13483).[11]


  1. ^ a b c d "JPL Small-Body Database Browser: 3823 Yorii (1988 EC1)" (2015-08-10 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(3823) Yorii". Dictionary of Minor Planet Names – (3823) Yorii. Springer Berlin Heidelberg. p. 324. doi:10.1007/978-3-540-29925-7_3816 . ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (3823) Yorii" . Asteroid Lightcurve Database (LCDB). Retrieved 3 January 2017.
  4. ^ 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:1606.08923 . Bibcode:2016AJ....152...63N . doi:10.3847/0004-6256/152/3/63 . Retrieved 3 January 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:1509.02522 . Bibcode:2015ApJ...814..117N . doi:10.1088/0004-637X/814/2/117 . Retrieved 3 January 2017.
  6. ^ 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 .
  7. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters" . The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096 . Bibcode:2011ApJ...741...68M . doi:10.1088/0004-637X/741/2/68 . Retrieved 3 January 2017.
  8. ^ a b Warner, Brian D. (April 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 September-December" . The Minor Planet Bulletin. 41 (2): 102–112. Bibcode:2014MPBu...41..102W . ISSN 1052-8091 . Retrieved 3 January 2017.
  9. ^ 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 3 January 2017.
  10. ^ a b "3823 Yorii (1988 EC1)" . Minor Planet Center. Retrieved 3 January 2017.
  11. ^ "MPC/MPO/MPS Archive" . Minor Planet Center. Retrieved 3 January 2017.

External links

Categories: Minor planet object articles (numbered) | Background asteroids | Discoveries by Masaru Arai | Discoveries by Hiroshi Mori | Minor planets named for places | Named minor planets | Astronomical objects discovered in 1988

Information as of: 01.07.2020 10:15:03 CEST

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