1286 Banachiewicza

1286 Banachiewicza (prov. designation: 1933 QH) is an elongated Eos asteroid from the outer regions of the asteroid belt. It was discovered on 25 August 1933, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[11] The stony S-type asteroid has a rotation period of 8.6 hours and measures approximately 21 kilometers (13 miles) in diameter. It was named after Polish astronomer Tadeusz Banachiewicz.[2]

1286 Banachiewicza
001286-asteroid shape model (1286) Banachiewicza.png
Modelled shape of Banachiewicza
Discovery [1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date25 August 1933
(1286) Banachiewicza
Named after
Tadeusz Banachiewicz[2]
(Polish astronomer)
1933 QH · 1928 SE
1954 UJ
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc88.78 yr (32,428 days)
Aphelion3.2926 AU
Perihelion2.7553 AU
3.0240 AU
5.26 yr (1,921 days)
0° 11m 14.64s / day
Physical characteristics
Mean diameter
  • 21.474±0.208 km[5]
  • 21.84±0.49 km[6]
  • 22.569±0.129 km[7]
8.631±0.001 h[8]
  • (214.0°, 62.0°) (λ11)[9]
  • (64.0°, 60.0°) (λ22)[9]
  • 0.1554±0.0270[7]
  • 0.170±0.014[5]
  • 0.171±0.009[6]
Tholen = S[1][3]
B–V = 0.850[1]
U–B = 0.430[1]
10.626±0.009 (R)[10] · 10.88[1][3][6][7]

Orbit and classificationEdit

Banachiewicza is a member the Eos family (606),[4] the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[12]:23 It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,921 days). Its orbit has an eccentricity of 0.09 and an inclination of 10° with respect to the ecliptic.[1] The body's observation arc begins with its first observation as 1928 SE at Heidelberg Observatory in September 1928, almost five years prior to its official discovery observation at Uccle.[11]


This minor planet was named after Polish astronomer Tadeusz Banachiewicz (1882–1954), who was also a prominent mathematician and geodesist, as well as the director of the Kraków Observatory (055) and vice-president of the International Astronomical Union in the 1930s. The subsequently numbered asteroid 1287 Lorcia – also discovered by Sylvain Arend, and also an Eoan asteroid – was named after his wife. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 118). The lunar crater Banachiewicz was also named in his honor.[2]

Physical characteristicsEdit

In the Tholen classification, Banachiewicza is a stony S-type asteroid,[1] while the overall spectral type of the Eos family is that of a K-type.[12]:23

Rotation period and polesEdit

Lightcurve-based 3D-model of Banachiewicza

In August 2008, the best-rated rotational lightcurve of Banachiewicza was obtained from photometric observations by French amateur astronomers Laurent Bernasconi, Cyril Cavadore and Stéphane Charbonnel. Lightcurve analysis gave a rotation period of 8.631 hours with a brightness variation of 0.54 magnitude, indicative for an irregular, elongated shape (U=3).[8]

Other observations at the Palomar Transient Factory in California, and by a collaboration of Hungarian astronomers gave a period of 8.628 and 5 hours with an amplitude of 0.36 and 0.4 magnitude, respectively (U=2/2).[13][10] In 2013, an international study modeled a lightcurve with a concurring period of 8.63043±0.00005 hours and found two spin axis of (214.0°, 62.0°) and (64.0°, 60.0°) in ecliptic coordinates (λ, β) (Q=2).[9]

Diameter and albedoEdit

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Banachiewicza measures between 21.474 and 22.569 kilometers in diameter and its surface has an albedo between 0.1554 and 0.171.[5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 19.82 kilometers based on an absolute magnitude of 10.88.[3]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1286 Banachiewicza (1933 QH)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 19 September 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1286) Banachiewicza". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 106. doi:10.1007/978-3-540-29925-7_1287. ISBN 978-3-540-00238-3.
  3. ^ a b c d "LCDB Data for (1286) Banachiewicza". Asteroid Lightcurve Database (LCDB). Retrieved 19 September 2017.
  4. ^ a b "Asteroid 1286 Banachiewicza – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
  5. ^ 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 19 September 2017.
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  7. ^ 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.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1286) Banachiewicza". Geneva Observatory. Retrieved 19 September 2017.
  9. ^ a b c Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv:1309.4296. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 19 September 2017.
  10. ^ a b 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.
  11. ^ a b "1286 Banachiewicza (1933 QH)". Minor Planet Center. Retrieved 19 September 2017.
  12. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
  13. ^ Székely, P.; Kiss, L. L.; Szabó, Gy. M.; Sárneczky, K.; Csák, B.; Váradi, M.; et al. (August 2005). "CCD photometry of 23 minor planets". Planetary and Space Science. 53 (9): 925–936. arXiv:astro-ph/0504462. Bibcode:2005P&SS...53..925S. doi:10.1016/j.pss.2005.04.006.

External linksEdit