1552 Bessel

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1552 Bessel
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 24 February 1938
Designations
MPC designation (1552) Bessel
Named after
Friedrich Bessel
(German astronomer)[2]
1938 DE1 · 1933 FJ1
1948 EH · 1951 UF
main-belt · Eos[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 84.01 yr (30,686 days)
Aphelion 3.3064 AU
Perihelion 2.7230 AU
3.0147 AU
Eccentricity 0.0968
5.23 yr (1,912 days)
147.81°
0° 11m 17.88s / day
Inclination 9.8420°
10.001°
39.416°
Physical characteristics
Dimensions 16.63±0.84 km[4]
18.33 km (derived)[3]
18.514±0.066 km[5]
18.817±0.101 km[6]
8.96318±0.00002 h[a]
8.996±0.006 h[7]
0.1448 (derived)[3]
0.1514±0.0332[6]
0.156±0.023[5]
0.193±0.024[4]
S[3]
11.3[4][6] · 11.4[1][3] · 11.53±0.24[8]

1552 Bessel, provisional designation 1938 DE1, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 18 kilometers in diameter.

It was discovered on 24 February 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, and named after German astronomer Friedrich Bessel.[2][9]

Orbit and classification[edit]

Bessel is a stony asteroid and a member of the Eos family that orbits the Sun in the outer main-belt at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,912 days). Its orbit has an eccentricity of 0.10 and an inclination of 10° with respect to the ecliptic.[1] First observed as 1933 FJ1 at Heidelberg in 1933, the body's observation arc begins at Turku, 5 days prior to its official discovery observation.[9]

Physical characteristics[edit]

Rotation period and pole[edit]

In March 2011, a rotational lightcurve of Bessel was obtained from photometric observations by Italian amateur astronomer Silvano Casulli. Lightcurve analysis gave a well-defined rotation period of 8.996 hours with a brightness variation of 0.29 magnitude (U=3).[7]

In 2016, a modeled lightcurve using photometric data from various sources gave a concurring period of 8.96318 hours, as well as a spin axis of (61.0°, −50.0°) in ecliptic coordinates (λ, β) (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, Bessel measures between 16.63 and 18.817 kilometers in diameter, and its surface has an albedo between 0.1514 and 0.193.[4][5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1448 and a diameter of 18.33 kilometers with an absolute magnitude of 11.4.[3]

Naming[edit]

This minor planet was named after German astronomer Friedrich Wilhelm Bessel (1789–1846), who measured the first stellar parallax in 1838. His measured parallax of 0.314 arcseconds for 61 Cygni gave a distance of 10.3 light-years, which is 9.6% off today's measured distance of 11.4 light-years. Bessel is also honored by the lunar crater Bessel.[2][10] Naming citation was published before November 1977 (M.P.C. 2278).[11]

Notes[edit]

  1. ^ a b Hanus (2016) web: rotation period of 8.96318 hours. (λ, β)-Pole axis of (61.0°, −50.0°) and (221.0°, −57.0°) . Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1552) Bessel

References[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 1552 Bessel (1938 DE1)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 11 April 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1552) Bessel. Springer Berlin Heidelberg. p. 123. ISBN 978-3-540-00238-3. Retrieved 11 April 2017. 
  3. ^ a b c d e f "LCDB Data for (1552) Bessel". Asteroid Lightcurve Database (LCDB). Retrieved 11 April 2017. 
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 11 April 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 11 April 2017. 
  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 11 April 2017. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1552) Bessel". Geneva Observatory. Retrieved 11 April 2017. 
  8. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 11 April 2017. 
  9. ^ a b "1552 Bessel (1938 DE1)". Minor Planet Center. Retrieved 11 April 2017. 
  10. ^ "Friedrich Wilhelm Bessel (July 22, 1784 - March 17, 1846)". seds.org. Retrieved 11 April 2017. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 April 2017. 

External links[edit]