1286 Banachiewicza

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1286 Banachiewicza
1286Banachiewicza (Lightcurve Inversion).png
Lightcurve-based 3D-model of Banachiewicza
Discovery [1]
Discovered by S. Arend
Discovery site Uccle Obs.
Discovery date 25 August 1933
MPC designation (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 arc 88.78 yr (32,428 days)
Aphelion 3.2926 AU
Perihelion 2.7553 AU
3.0240 AU
Eccentricity 0.0888
5.26 yr (1,921 days)
0° 11m 14.64s / day
Inclination 9.7486°
Physical characteristics
Dimensions 19.82 km (calculated)[3]
21.474±0.208 km[5]
21.84±0.49 km[6]
22.569±0.129 km[7]
5 h[8]
8.628±0.0275 h[9]
8.63 h[3]
8.63043±0.00005 h[10]
8.631±0.001 h[11]
0.20 (assumed)[3]
Tholen = S[1][3]
B–V = 0.850[1]
U–B = 0.430[1]
10.626±0.009 (R)[9] · 10.88[1][3][6][7]

1286 Banachiewicza, provisional designation 1933 QH, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 25 August 1933, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[12] The asteroid was named after Polish astronomer Tadeusz Banachiewicz.[2]

Orbit and classification[edit]

Banachiewicza is a member the Eos family (606),[4] the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[13]: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 identification as 1928 SE at Heidelberg Observatory in September 1928, almost five years prior to its official discovery observation at Uccle.[12]

Physical characteristics[edit]

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.[13]:23

Rotation period[edit]

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).[11] 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).[8][9]

Spin axis[edit]

In 2013, an international study modeled a lightcurve with a concurring period of 8.63043 hours and found two spin axis of (214.0°, 62.0°) and (64.0°, 60.0°) in ecliptic coordinates (λ, β) (Q=2).[10]

Diameter and albedo[edit]

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]


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]


  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). Dictionary of Minor Planet Names – (1286) Banachiewicza. Springer Berlin Heidelberg. p. 106. ISBN 978-3-540-00238-3. Retrieved 19 September 2017.
  3. ^ a b c d e f g "LCDB Data for (1286) Banachiewicza". Asteroid Lightcurve Database (LCDB). Retrieved 19 September 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 19 September 2017.
  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. Retrieved 19 September 2017.
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 September 2017.
  8. ^ a b 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. Retrieved 19 September 2017.
  9. ^ 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 19 September 2017.
  10. ^ a b 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.
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1286) Banachiewicza". Geneva Observatory. Retrieved 19 September 2017.
  12. ^ a b "1286 Banachiewicza (1933 QH)". Minor Planet Center. Retrieved 19 September 2017.
  13. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 19 September 2017.

External links[edit]