1615 Bardwell

1615 Bardwell
Discovery [1]
Discovered by Indiana Asteroid Program
Discovery site Goethe Link Obs.
Discovery date 28 January 1950
Designations
MPC designation 1615 Bardwell
Named after
 Conrad M. Bardwell
(astronomer)[2]
1950 BW · 1926 TO
1937 TJ · 1948 RB1
1948 RH1 · 1948 TG
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 89.03 yr (32,517 days)
Aphelion 3.6763 AU
Perihelion 2.5657 AU
3.1210 AU
Eccentricity 0.1779
5.51 yr (2,014 days)
28.555°
Inclination 1.6880°
152.54°
251.75°
Physical characteristics
Dimensions 27.78 km[4]
31.579±0.250 km[5]
25.01±1.49 km[6]
31±3 km[7]
18 h[lower-alpha 1][1]
0.0642[4]
0.0497±0.0192[5]
0.079±0.015[6]
0.05±0.01[7]
B–V = 0.692
U–B = 0.329
Tholen = B
B [3]
11.38

    1615 Bardwell, provisional designation 1950 BW, is a rare-type bluish asteroid from the outer region of the asteroid belt, that measures about 30 kilometers in diameter. It was discovered by the Indiana Asteroid Program at the U.S. Goethe Link Observatory near Brooklyn, Indiana at on 28 January 1950.[8]

    The dark asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.6–3.7 AU once every five and a half years (2,014 days). Its orbit shows an eccentricity of 0.18 and is tilted by 2 degrees to the plane of the ecliptic. It has a rotation period of 18 hours[lower-alpha 1] and an albedo between 0.05 and 0.08, based on data from the IRAS, WISE and NEOWISE surveys.[4][5][6][7]

    It is a B-type asteroid under the Tholen classification taxonomy, a rare subtype of the abundant carbonaceous C-types found in the outer belt. The spectra of B-type bodies show a broad absorption feature at one mircon wavelength that is associated with the presence of magnetite and is what gives the asteroid its blue tint.[9] There are only a few dozens asteroids known to display such a B-spectrum.[10]

    The Themistian asteroids was named after Conrad M. Bardwell (1926–2010), a research associate at the Cincinnati Observatory and later associate director of the Minor Planet Center in Cambridge, Massachusetts, United States. Bardwell successfully established numerous identifications from observations in widely separated oppositions and provided observers with reliable data of orbital elements.[2]

    References

    1. 1 2 Tedesco (1979): rotation period of 18 hours with a brightness amplitude of 0.2. Summary figures at Asteroid Lightcurve Database for (1615) Bardwell
    1. 1 2 3 "JPL Small-Body Database Browser: 1615 Bardwell (1950 BW)" (2015-10-11 last obs.). Jet Propulsion Laboratory. Retrieved November 2015.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1615) Bardwell. Springer Berlin Heidelberg. p. 128. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 "LCDB Data for (1615) Bardwell". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved November 2015.
    5. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; 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. Retrieved November 2015.
    6. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    7. 1 2 3 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; et al. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy and Astrophysics 554: 16. arXiv:1303.5487. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved December 2015.
    8. ↑ "1615 Bardwell (1950 BW)". Minor Planet Center. Retrieved November 2015.
    9. ↑ Yang, Bin; Jewitt, David (September 2010), "Identification of Magnetite in B-type Asteroids", The Astronomical Journal 140 (3), pp. 692–698, arXiv:1006.5110, Bibcode:2010AJ....140..692Y, doi:10.1088/0004-6256/140/3/692
    10. ↑ "JPL db query spectral type = B (SMASSII and/or Tholen)". JPL Small-Body Database. Jet Propulsion Laboratory. Retrieved November 2015.

    External links


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