1128 Astrid

1128 Astrid, provisional designation 1929 EB, is a carbonaceous Astridian asteroid from the central region of the asteroid belt. It is the parent body of the Astrid family and measures approximately 40 kilometers in diameter.

1128 Astrid
Discovery[1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date10 March 1929
Designations
(1128) Astrid
Named after
Astrid of Sweden
(Queen consort of the Belgians)[2]
1929 EB · 1949 QF2
1954 UL3 · 1964 VW
1972 LM1 · A917 SQ
A920 JA
main-belt · (middle) · Astrid[3]
AdjectivesAstridian
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc97.07 yr (35,455 days)
Aphelion2.9171 AU
Perihelion2.6577 AU
2.7874 AU
Eccentricity0.0465
4.65 yr (1,700 days)
248.28°
0° 12m 42.48s / day
Inclination1.0145°
59.420°
234.37°
Physical characteristics
Dimensions33.28±9.67 km[4]
34.60 km (derived)[5]
34.69±2.1 km[6]
41.851±0.278 km[7]
41.97±0.72 km[8]
44.784±0.912 km[9]
45.03±10.37 km[10]
52.48±0.40 km[11]
10.2±0.1 h[12]
10.228±0.002 h[12]
10.229±0.0031 h[13]
0.031±0.004[11]
0.04±0.02[10]
0.0462±0.0181[9]
0.053±0.002[8]
0.06±0.03[4]
0.0644 (derived)[5]
0.0770±0.010[6]
SMASS = C[1] · C[5]
10.588±0.002 (R)[13] · 10.70[6][8][9] · 10.80[11] · 10.90[1][4][5] · 10.93[10] · 11.02±0.35[14]

    The asteroid was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 10 March 1929, and later named for Astrid of Sweden, Queen consort of the Belgians.[2][15]

    Orbit and classification

    Astrid is the parent body of the Astrid family (515), a smaller asteroid family of nearly 500 carbonaceous members. It is located in the outermost central main-belt, near a prominent Kirkwood gap, that marks the 5:2 orbital resonance with Jupiter, and divides the asteroid belt into a central and outer part.[3][16][17]: 23 

    Astrid orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,700 days). Its orbit has an eccentricity of 0.05 and an inclination of 1° with respect to the ecliptic.[1]

    The asteroid was first identified as A917 SQ at the Simeiz Observatory in September 1917. The body's observation arc begins with its identification as A920 JA at Heidelberg Observatory in May 1920, nearly 9 years prior to its official discovery observation at Uccle.[15]

    Physical characteristics

    In the SMASS classification, Astrid is a carbonaceous C-type asteroid, which corresponds to the overall spectral type of the Astrid family.[1]

    Rotation period

    In September 2005, a rotational lightcurve of Astrid was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 10.228 hours with a brightness variation of 0.29 magnitude (U=2+).[12] In October 2010, additional lightcurves were obtained at the Palomar Transient Factory in California, as well as by astronomers Eric Barbotin and Raoul Behrend, which gave a concurring period of 10.2 and 10.229 hours with an amplitude of 0.10 and 0.13 magnitude, respectively (U=1/2).[12][13]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Astrid measures between 33.28 and 52.48 kilometers in diameter and its surface has an albedo between 0.031 and 0.077.[4][6][7][8][9][10][11]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0644 and a diameter of 34.60 kilometers based on an absolute magnitude of 10.9.[5]

    1128 Astrid has been observed to occult 2 stars, both events on 24 Jun 2023 UT.

    Naming

    This minor planet was named in memory of Astrid of Sweden (1905–1935), Queen consort of the Belgians, who died at the age of 29 in a car accident while on vacation in Switzerland.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 106).[2]

    References
    1. "JPL Small-Body Database Browser: 1128 Astrid (1929 EB)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 1 September 2017.
    2. Schmadel, Lutz D. (2007). "(1128) Astrid". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1129. ISBN 978-3-540-00238-3.
    3. "Asteroid 1128 Astrid – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    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 1 September 2017.
    5. "LCDB Data for (1128) Astrid". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2017.
    6. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    7. 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 1 September 2017.
    8. 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)
    9. 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.
    10. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
    11. 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 1 September 2017.
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (1128) Astrid". Geneva Observatory. Retrieved 1 September 2017.
    13. 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 1 September 2017.
    14. 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 1 September 2017.
    15. "1128 Astrid (1929 EB)". Minor Planet Center. Retrieved 1 September 2017.
    16. Vokrouhlický, D.; Broz, M.; Bottke, W. F.; Nesvorný, D.; Morbidelli, A. (May 2006). "Yarkovsky/YORP chronology of asteroid families" (PDF). Icarus. 182 (1): 118–142. Bibcode:2006Icar..182..118V. doi:10.1016/j.icarus.2005.12.010. Retrieved 1 September 2017.
    17. 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.

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