4149 Harrison

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4149 Harrison
Discovery [1]
Discovered byB. A. Skiff
Discovery siteAnderson Mesa Stn.
Discovery date9 March 1984
MPC designation(4149) Harrison
Named after
George Harrison
(guitarist, The Beatles)[2]
1984 EZ
main-belt · Eunomia[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc39.32 yr (14,360 days)
Aphelion2.9955 AU
Perihelion2.3356 AU
2.6655 AU
4.35 yr (1,590 days)
0° 13m 35.4s / day
Physical characteristics
Dimensions8.14 km (derived)[3]
10.739±0.042 km[5]
3.7490±0.0002 h[a]
3.956±0.001 h[6]
0.21 (assumed)[3]
12.3[1][5] · 12.31±0.16 (R)[a] · 12.54±0.22[7] · 12.76[3]

4149 Harrison, provisional designation 1984 EZ, is a stony Eunomian asteroid from the middle region of the asteroid belt, approximately 10 kilometers in diameter. The asteroid was discovered on 9 March 1984, by American astronomer Brian Skiff at Lowell's Anderson Mesa Station in Flagstaff, Arizona, and named after George Harrison.[8]

Orbit and classification[edit]

Harrison is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in the central main-belt at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,590 days). Its orbit has an eccentricity of 0.12 and an inclination of 13° with respect to the ecliptic.[1] A first precovery was taken at Palomar Observatory in 1977, extending the body's observation arc by 7 years prior to its discovery.[8]

Physical characteristics[edit]

Rotation period[edit]

A rotational lightcurve of Harrison was obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory in May 2015. It gave a well-defined rotation period of 3.7490±0.0002 hours with a brightness variation of 0.42 in magnitude (U=3).[a] During the following month, photometric observations at three Italian observatories gave a second lightcurve with a period of 3.956±0.001 hours and an amplitude of 0.37 in magnitude (U=2+).[6]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Harrison measures 10.1 and 10.7 kilometers in diameter and its surface has an albedo of 0.19 and 0.23, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from 15 Eunomia, the family's largest member and namesake – and calculates a diameter of 8.1 kilometers with an absolute magnitude of 12.76.[3]


This minor planet was named in honor of guitarist, singer and songwriter, George Harrison (1943–2001), who was the lead guitarist of the English rock band The Beatles, after which the main-belt asteroid 8749 Beatles is named.[2] The minor planets 4147 Lennon, 4148 McCartney and 4150 Starr honor the other three members of the band. The official naming citation was published by the Minor Planet Center on 10 April 1990 (M.P.C. 16248).[9]


  1. ^ a b c Pravec (2015) web: lightcurve plot of (4149) Harrison with a rotation period 3.7490±0.0002 hours with a brightness amplitude of 0.42 mag. G: 0.15±0.2, abs. magnitude: 12.31±0.16, phase: 11.1, PABL: 256.2, and PABB: 17.3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2015)


  1. ^ a b c d "JPL Small-Body Database Browser: 4149 Harrison (1984 EZ)" (2017-02-04 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(4149) Harrison". Dictionary of Minor Planet Names – (4149) Harrison. Springer Berlin Heidelberg. p. 355. doi:10.1007/978-3-540-29925-7_4121. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (4149) Harrison". Asteroid Lightcurve Database (LCDB). Retrieved 10 August 2016.
  4. ^ 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:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 5 December 2016.
  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 Papini, Riccardo; Franco, Lorenzo; Marchini, Alessandro; Salvaggio, Fabio (October 2015). "Rotation Period Determination for 4149 Harrison and (5633) 1978 UL7". The Minor Planet Bulletin. 42 (4): 281–283. Bibcode:2015MPBu...42..281P. ISSN 1052-8091. Retrieved 10 August 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 10 August 2016.
  8. ^ a b "4149 Harrison (1984 EZ)". Minor Planet Center. Retrieved 10 August 2016.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 August 2016.

External links[edit]