3996 Fugaku

3996 Fugaku
Discovery [1]
Discovered byM. Arai
H. Mori
Discovery siteYorii Obs.
Discovery date5 December 1988
(3996) Fugaku
Named after
Mount Fuji (Japan)[2]
1988 XG1 · 1939 FZ
1957 TB · 1981 SO5
1981 UM16
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc78.22 yr (28,570 days)
Aphelion2.4941 AU
Perihelion2.0254 AU
2.2597 AU
3.40 yr (1,241 days)
0° 17m 24.36s / day
Physical characteristics
Dimensions5.151±0.074 km[4]
5.231±0.032 km[5]
5.40 km (calculated)[3]
5.88±1.10 km[6]
7.1912±0.0016 h[7]
0.24 (assumed)[3]
13.0[1][5][6] · 13.055±0.003 (R)[7] · 13.5[3] · 13.57±0.25[8]

3996 Fugaku, provisional designation 1988 XG1, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 5 December 1988, by Japanese amateur astronomers Masaru Arai and Hiroshi Mori at Yorii Observatory in central Japan.[9] It was named for Mount Fuji, Japan.[2]


Orbit and classification

Fugaku is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 5 months (1,241 days). Its orbit has an eccentricity of 0.10 and an inclination of 2° with respect to the ecliptic.[1] It was first identified as 1939 FZ at Turku Observatory in 1939, extending the asteroid's observation arc by 49 years prior to its official discovery observation.[9]

Physical characteristics

Fugaku has been characterized as a stony S-type asteroid, the most common type in the inner main-belt.[1]

Rotation period

In March 210, a rotational lightcurve of Fugaku was obtained from photometric observations at the Palomar Transient Factory in California. It gave a rotation period of 7.1912 hours with a change in brightness of 0.86 magnitude (U=2).[7]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Fugaku measures between 5.15 and 5.88 kilometers in diameter, and its surface has an albedo between 0.34 and 0.42.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this family – and calculates a diameter of 5.40 kilometers with an absolute magnitude of 13.5.[3]


This minor planet was named for the ancient name of Mount Fuji, Japan's highest mountain and a well-known symbol. Another minor planet, 1584 Fuji, is also named for this mountain.[2] The official naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34619).[10]


  1. ^ a b c d e "JPL Small-Body Database Browser: 3996 Fugaku (1988 XG1)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(3996) Fugaku". Dictionary of Minor Planet Names – (3996) Fugaku. Springer Berlin Heidelberg. p. 340. doi:10.1007/978-3-540-29925-7_3981 . ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (3996) Fugaku" . Asteroid Lightcurve Database (LCDB). Retrieved 3 January 2017.
  4. ^ 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.
  5. ^ 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 .
  6. ^ 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.
  7. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry" . The Astronomical Journal. 150 (3): 35. arXiv:1504.04041 . Bibcode:2015AJ....150...75W . doi:10.1088/0004-6256/150/3/75 . Retrieved 3 January 2017.
  8. ^ 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.
  9. ^ a b "3996 Fugaku (1988 XG1)" . Minor Planet Center. Retrieved 3 January 2017.
  10. ^ "MPC/MPO/MPS Archive" . Minor Planet Center. Retrieved 3 January 2017.

External links

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

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