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(7348) 1993 FJ22 is a carbonaceous, Themistian asteroid from the outer region of the asteroid belt, about 10 kilometers in diameter. It was discovered on 21 March 1993, by the Uppsala-ESO Survey of Asteroids and Comets (UESAC) at ESO's La Silla Observatory site in northern Chile.[5]

(7348) 1993 FJ22
Discovery [1]
Discovered byUESAC
Discovery siteLa Silla Obs.
Discovery date21 March 1993
MPC designation(7348) 1993 FJ22
1993 FJ22 · 1933 FU
1978 NM5 · 1991 XF3
main-belt · Themis[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc84.28 yr (30,783 days)
Aphelion3.4232 AU
Perihelion2.7623 AU
3.0927 AU
5.44 yr (1,987 days)
Physical characteristics
Dimensions9.91 km (calculated)[2]
3.470±0.020 h[3]
3.4735±0.0031 h[4]
0.08 (assumed)[2]
12.9[1] · 12.780±0.050[3] · 12.929±0.001[4] · 13.38[2]

Classification and orbitEdit

The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits.[2] It orbits the Sun in the outer main-belt at a distance of 2.8–3.4 AU once every 5 years and 5 months (1,987 days). Its orbit has an eccentricity of 0.11 and an inclination of 1° with respect to the ecliptic. It was first identified as 1933 FU at Heidelberg in 1933, extending the body's observation arc by 60 years prior to its official discovery observation at La Silla.[1]

Physical characteristicsEdit


In 2014, two rotational lightcurves of this asteroid were obtained from photometric observations in the R-band at the U.S. Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 3.4735 and 3.470 hours with a brightness variation of 0.10 and 0.13 in magnitude, respectively (U=2/2).[3][4]

Diameter and albedoEdit

The Collaborative Asteroid Lightcurve Link (CALL) assumes a low albedo of 0.08 for the asteroid's surface and calculates a diameter of 9.9 kilometers, based on an absolute magnitude of 13.38.[2]


As of 2017, the asteroid has not been named.[5]


  1. ^ a b c d "JPL Small-Body Database Browser: 7348 (1993 FJ22)" (2017-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 5 September 2017.
  2. ^ a b c d e f g "LCDB Data for (7348)". Asteroid Lightcurve Database (LCDB). Retrieved 22 August 2016.
  3. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 22 August 2016.
  4. ^ 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 22 August 2016.
  5. ^ a b "7348 (1993 FJ22)". Minor Planet Center. Retrieved 22 August 2016.

External linksEdit