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.[a][2][7]
Previously, on 18 March 1892, another body discovered by Max Wolf with the provisional designation1892 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,[a] 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]
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'sobservation arc begins with its official discovery observation at Heidelberg in 1910.[7]
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 PlanetsbyPaul Herget in 1955 (H 37).[2]
In 2013, a rotational lightcurveofAdalberta was obtained from photometric observations at Los Algarrobos Observatory (I38) in Uruguay. Light-curve analysis gave a well-defined rotation periodof3.5553±0.0001 hours with a brightness variation of 0.44 magnitude (U=3).[5]
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]
