330 Adalberta

330 Adalberta (prov. designation: A910 CB) is a stony asteroid from the inner regions of the asteroid belt, approximately 9.5 kilometers in diameter. It is likely named for either Adalbert Merx or Adalbert Krüger. It was discovered by Max Wolf in 1910. In the 1980s, the asteroid's permanent designation was reassigned from the non-existent object 1892 X.[lower-alpha 1][2][7]

330 Adalberta
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date2 February 1910
Designations
(330) Adalberta
Pronunciation/ædəlˈbɜːrtə/
Named after
Adalbert Merx
(discoverer's family)
Adalbert Krüger (astronomer) [2]
A910 CB · 1937 AD
1951 SW · 1974 OQ
1978 PS1 · 1978 QJ3
1980 EE
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc106.36 yr (38,848 days)
Aphelion3.0929 AU
Perihelion1.8426 AU
2.4677 AU
Eccentricity0.2533
3.88 yr (1,416 days)
283.89°
0° 15m 15.12s / day
Inclination6.7569°
137.14°
259.26°
Physical characteristics
Mean diameter
9.111±0.303 km[4]
3.5553±0.0001 h[5]
0.20 (assumed)[3]
0.256±0.045[4]
S [3]
12.30[4] · 12.4[1][3] · 12.46±0.26[6]

    Discovery

    Adalberta was discovered on 2 February 1910, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[7]

    Previously, on 18 March 1892, another body discovered by Max Wolf with the provisional designation 1892 X was originally designated 330 Adalberta, but was subsequently lost and never recovered (also see Lost minor planet). In 1982, it was determined that Wolf erroneously measured two images of stars, not asteroids. As it was a false positive and the body never existed,[lower-alpha 1] the name Adalberta and number "330" was then reused for this asteroid, A910 CB. MPC citation was published on 6 June 1982 (M.P.C. 6939).[2][8]

    Orbit and classification

    The S-type asteroid orbits the Sun in the inner main-belt at a distance of 1.8–3.1 AU once every 3 years and 11 months (1,416 days). Its orbit has an eccentricity of 0.25 and an inclination of 7° with respect to the ecliptic.[1] Adalberta's observation arc begins with its official discovery observation at Heidelberg in 1910.[7]

    Naming

    This minor planet was named in honor of the discoverer's father-in-law, Adalbert Merx (after whom another minor planet 808 Merxia is also named). However it is also possible that it was named for Adalbert Krüger (1832–1896), a German astronomer and editor of the Astronomische Nachrichten, which was one of the first international journals in the field of astronomy.[2] Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 37).[2]

    Physical characteristics

    Rotation period

    In 2013, a rotational lightcurve of Adalberta was obtained from photometric observations at Los Algarrobos Observatory (I38) in Uruguay. Light-curve analysis gave a well-defined rotation period of 3.5553±0.0001 hours with a brightness variation of 0.44 magnitude (U=3).[5]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Adalberta measures 9.11 kilometers in diameter, and its surface has an albedo of 0.256,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.84 kilometers using an absolute magnitude of 12.4.[3]

    Notes
    1. In 1982, a reexamination of the original plates by Richard Martin West, C. Madsen, and Lutz D. Schmadel showed that 1892 X were galactic stars.[lower-alpha 2]

    References
    1. "JPL Small-Body Database Browser: 330 Adalberta (A910 CB)" (2016-06-13 last obs.). Jet Propulsion Laboratory. Retrieved 5 January 2017.
    2. Schmadel, Lutz D. (2007). "(330) Adalberta". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 43. doi:10.1007/978-3-540-29925-7_331. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (330) Adalberta". Asteroid Lightcurve Database (LCDB). Retrieved 5 January 2017.
    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 5 January 2017.
    5. Alavarez, Eduardo Manuel; Pilcher, Frederick (January 2014). "Period Determination for 330 Adalberta: A Low Numbered Asteroid with a Previously Unknown Period". The Minor Planet Bulletin. 41 (1): 23–24. Bibcode:2014MPBu...41...23A. ISSN 1052-8091. Retrieved 5 January 2017.
    6. 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 5 January 2017.
    7. "330 Adalberta (A910 CB)". Minor Planet Center. Retrieved 5 January 2017.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 January 2017.
    9. West, R. M.; Madsen, C.; Schmadel, L. D. (June 1982). "On the reality of minor planet /330/ Adalberta". Astronomy and Astrophysics: 198–202. Bibcode:1982A&A...110..198W. Retrieved 5 January 2017.
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