1722 Goffin

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1722 Goffin
Discovery [1]
Discovered by E. Delporte
Discovery site Uccle Obs.
Discovery date 23 February 1938
MPC designation (1722) Goffin
Named after
Edwin Goffin
(amateur astronomer)[2]
1938 EG · 1942 DJ
1950 HK · 1952 SW
1952 UQ · 1960 WB
1964 UF · 1964 VD1
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 79.09 yr (28,889 days)
Aphelion 2.6369 AU
Perihelion 2.3902 AU
2.5135 AU
Eccentricity 0.0491
3.99 yr (1,456 days)
0° 14m 50.28s / day
Inclination 5.4668°
Physical characteristics
Dimensions 10.290±0.118[4]
10.44 km (taken)[3]
10.442 km[5]
10.446±0.130 km[6]
28.8±1.0 h[a]
31 h[7]
S(est.)[7] · S[3]
B–V = 0.890[1]
12.18[3][5][6][a] · 12.30[1] · 12.34[7]

1722 Goffin, provisional designation 1938 EG, is a stony asteroid from the central region of the asteroid belt, approximately 10.3 kilometers in diameter.

It was discovered on 23 February 1938, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle, Belgium.[8] It was later named after Belgian amateur astronomer Edwin Goffin, following a suggestion by Jean Meeus.[2]

Orbit and classification[edit]

Minor planet 1722 Goffin orbits the Sun at a distance of 2.4–2.6 AU once every 3 years and 12 months (1,456 days). Its orbit has an eccentricity of 0.05 and an inclination of 5° with respect to the ecliptic.[1] The body's observation arc begins 6 days after its official discovery observation.[8]

Physical characteristics[edit]

It is an assumed S-type asteroid, one of the most common spectral types.[3][7]


(1722)'s first rotational lightcurve was obtained by American astronomer Richard P. Binzel at UT Austin in October 1984. It gave a rotation period of 31 hours and an brightness variation of 0.63 magnitude (U=2),[7] while Czech astronomers Petr Pravec and Adrián Galád at Ondřejov Observatory derived a period of 28.8 hours with and amplitude of 0.6 magnitude using Binzel's photmetric observations (U=n.a.).[a]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Goffin measures 10.29 kilometers in diameter and its surface has an albedo of 0.224 (using the 2014-published revised near-infrared albedo fits),[4] superseding a preliminary published diameter of 10.446 kilometers.[6] The Collaborative Asteroid Lightcurve Link takes Petr Pravec's 2012-revised WISE data, that gave an albedo of 0.2175 and a diameter of 10.442 kilometers.[3][5]


This minor planet was named in honor of the Belgian amateur astronomer Edwin Goffin (b. 1950), who has made extensive computations involving minor-planet orbits, and whose initials are indicated by the body's provisional designation, 1938 EG.[2] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6832).[9]


  1. ^ a b c Pravec (1984) web: rotation period 28.8±1.0 hours with a brightness amplitude of 0.6 mag. Quality code is not available. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1722) Goffin and Pravec, P.; Wolf, M.; Sarounova, L. (1984)


  1. ^ a b c d e "JPL Small-Body Database Browser: 1722 Goffin (1938 EG)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1722) Goffin. Springer Berlin Heidelberg. p. 137. ISBN 978-3-540-00238-3. Retrieved 21 December 2016. 
  3. ^ a b c d e f "LCDB Data for (1722) Goffin". Asteroid Lightcurve Database (LCDB). Retrieved 21 December 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 21 December 2016. 
  5. ^ a b c d Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 21 December 2016. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 21 December 2016. 
  7. ^ a b c d e Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus: 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 21 December 2016. 
  8. ^ a b "1722 Goffin (1938 EG)". Minor Planet Center. Retrieved 21 December 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 December 2016. 

External links[edit]