19982 Barbaradoore
Discovery[1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date22 January 1990
Designations
(19982) Barbaradoore
Named after
Barbara Doore
(discoverer's cousin)[2]
1990 BJ · 1983 AD2
Mars crosser[1][3]
main-belt[4] · Phocaea[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc33.36 yr (12,186 days)
Aphelion3.0039 AU
Perihelion1.6657 AU
2.3348 AU
Eccentricity0.2866
3.57 yr (1,303 days)
307.09°
0° 16m 34.68s / day
Inclination22.325°
290.03°
106.86°
Physical characteristics
Dimensions3.88±0.63 km[6]
4.668±0.120 km[7][8]
5.02±0.14 km[9]
5.66 km (calculated)[3]
3.3162±0.0003 h[lower-alpha 1]
0.20 (assumed)[3]
0.306±0.040[9][8]
0.3540±0.0784[7]
0.42±0.21[6]
S (assumed)[3]
13.13±0.47[10] · 13.4[7][9]
13.5[6] · 13.6[1][3]

    19982 Barbaradoore, provisional designation 1990 BJ, is an eccentric, stony Phocaea asteroid and a recent Mars-crosser from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 22 January 1990, by American astronomer Eleanor Helin at the Palomar Observatory in California, United States.[4] The asteroid was named after Barbara Doore, a cousin of the discoverer.[2]

    Orbit and classification

    When applying the Hierarchical Clustering Method to its proper orbital elements, Barbaradoore is a member of the Phocaea family (701),[5] a large family of stony S-type asteroids with nearly two thousand known members.[11]: 23  It orbits the Sun in the inner main-belt at a distance of 1.7–3.0 AU once every 3 years and 7 months (1,303 days). Its orbit has an eccentricity of 0.29 and an inclination of 22° with respect to the ecliptic.[1]

    Recent Mars-crosser and disparate criteria

    As of 2017, Barbaradoore has become a Mars-crossing asteroid (MCA), a dynamically unstable group between the main belt and the near-Earth populations, because its perihelion is at 1.6657, declining from 1.6662 AU just the year before. In the JPL Small-Body Database, an asteroid's perihelion has to be smaller than 1.666 AU in order to classify as MCA, while in the Lightcurve Data Base, that limit is defined at 1.668 AU.[12][lower-alpha 2]

    As of 2017, the Minor Planet Center does not classify Barbaradoore as an MCA, due to a differently defined threshold-perihelion of 1.6600 AU.[13] It therefore remains an unspecified main-belt asteroid.[4] Before 2017, when Barbaradoore's orbit did not yet cross that of Mars, it was an outer Mars grazer.

    Physical characteristics

    Barbaradoore is an assumed stony S-type asteroid,[3] which agrees with the overall spectral type for members of the Phocaea family.[11]: 23 

    Lightcurve

    In July 2010, a rotational lightcurve of Barbaradoore was obtained from photometric observation by Czech astronomer Petr Pravec at Ondřejov Observatory. Lightcurve analysis gave a well-defined rotation period of 3.3162 hours with a brightness variation of 0.28 magnitude (U=3).[lower-alpha 1]

    Diameter and albedo

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, Barbaradoore has a high albedo between 0.306 and 0.42 with a corresponding diameter of 3.88 to 5.02 kilometers,[6][7][9] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5.66 kilometers with an absolute magnitude of 13.6.[3]

    Comparison

    With a diameter of approximately 5 kilometers, Barbaradoore is one of the smallest sizable Mars-crossing asteroids compared to 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1508 Kemi (17 km), 1011 Laodamia (7.39 km), 1727 Mette (est 9 km), 1131 Porzia (7.13 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km) 1310 Villigera (15.24 km), and 1468 Zomba (7 km); and much smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 2204 Lyyli and 512 Taurinensis, which are larger than 20 kilometers in diameter.

    Naming

    This minor planet was named after a cousin of the discoverer, Barbara Hendricks Doore (born 1933). She is described by the discoverer as an admirer of sports and as an appreciated leader and volunteer, who has dedicated much of her time at Cathedral City's Boys and Girls Club in California.[2] The official naming citation was published by the Minor Planet Center on 24 June 2002 (M.P.C. 46012).[14]

    Notes

    1. 1 2 Pravec (2010): lightcurve plot of (19982) Barbaradoore with a rotation period of 3.3162±0.0003 hours and a brightness amplitude of 0.28 mag. CALL assigns a quality-code of Q=3, which denotes a "secure result within the precision given and no ambiguity". Summary figures at Collaborative Asteroid Lightcurve Link (CALL) and Ondrejov Asteroid Photometry Project – Pravec, P.; Wolf, M.; Sarounova, L. (2010)
    2. ↑ The JPL Small-Body Database uses the following orbital criteria to define a Mars-crossing asteroid: A perihelion that is between 1.3 and 1.666 AU with a semi-major axis that is not greater than 3.2 AU, see JPL's Orbit Classification

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 19982 Barbaradoore (1990 BJ)" (2016-05-22 last obs.). Jet Propulsion Laboratory. Archived from the original on 1 September 2020. Retrieved 27 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(19982) Barbaradoore". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 860. doi:10.1007/978-3-540-29925-7_9595. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 "LCDB Data for (19982) Barbaradoore". Asteroid Lightcurve Database (LCDB). Retrieved 26 April 2016.
    4. 1 2 3 "19982 Barbaradoore (1990 BJ)". Minor Planet Center. Retrieved 26 April 2016.
    5. 1 2 "Asteroid 19982 Barbaradoore – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    6. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 27 June 2017.
    7. 1 2 3 4 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. Retrieved 20 January 2016.
    8. 1 2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 3 December 2016.
    9. 1 2 3 4 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 20 January 2016.
    10. ↑ 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 April 2016.
    11. 1 2 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 978-0-8165-3213-1.
    12. ↑ "LCDB readme – 2. Taxonomic Class, orbital class, and albedo". Asteroid Lightcurve Database (LCDB). Archived from the original on 10 March 2021. Retrieved 20 January 2016.
    13. ↑ "13000 objects with orbit type Mars-crosser". Minor Planet Center. Retrieved 27 June 2017.
    14. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 April 2016.
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