_Rosalinde.png) Modelled shape ofRosalinde from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 10 August 1918 |
| Designations | |
| (900) Rosalinde | |
Named after | Character "Rosalinde" inthe operettaDie Fledermaus(byJohann Strauss II)[2] |
| A918 PJ · 1918 EC | |
| main-belt[1][3] · (inner) background[4][5] | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.46yr (37,057 d) |
| Aphelion | 2.8758AU |
| Perihelion | 2.0705 AU |
| 2.4732 AU | |
| Eccentricity | 0.1628 |
| 3.89 yr (1,421 d) | |
| 73.490° | |
| 0° 15m 12.24s / day | |
| Inclination | 11.559° |
| 182.26° | |
| 121.78° | |
| Physical characteristics | |
| 16.648±0.009 h[9] | |
| 11.6[1][3] | |
900 Rosalinde (prov. designation:A918 PJor1918 EC) is an elongatedbackground asteroid from the inner regions of theasteroid belt, that has amean diameter of approximately 19 kilometers (12 miles). It was discovered on 10 August 1918, by astronomerMax Wolf at theHeidelberg-Königstuhl State Observatory in southwest Germany.[1] The lengthyS/D-type asteroid has arotation period of 16.6 hours. It was likely named after "Rosalinde", a character in the operettaDie Fledermaus byJohann Strauss II.[2]
Rosalinde is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5] It orbits the Sun in theinner asteroid belt at a distance of 2.1–2.9 AU once every 3 years and 11 months (1,421 days;semi-major axis of 2.47 AU). Its orbit has aneccentricity of 0.16 and aninclination of 12° with respect to theecliptic.[3] The body'sobservation arc begins atHeidelberg-Königstuhl State Observatory with its official discovery observation on 10 August 1918.[1]
Thisminor planet was probably named after the character "Rosalinde", Eisenstein's wife, in the operettaDie Fledermaus byJohann Strauss II (1825–1899), after whom4559 Strauss was named. Rosalinde's maid in the operetta, "Adele", is likely the namesake chosen by Wolf for another asteroid,812 Adele.Lutz Schmadel, the author of theDictionary of Minor Planet Names learned about the discoverer's source of inspiration from private communications with Dutch astronomerIngrid van Houten-Groeneveld, who worked as a young astronomer at the discovering Heidelberg Observatory.[2]
Rosalinde is anS-type/D-type in the SMASS-Ispectral type-classification by Xu (1995), which surveyed and classified a total of 221 objects.[5] However,Rosalinde's classification, with its moderate albedo of 0.1(see below) does not correspond to more modern taxonomies such as the Bus–BinzelSMASS classification (II), where the bright S-types and the dark D-types do not have intermediate albedos.
.png)
In June 2011, a rotationallightcurve ofRosalinde was obtained fromphotometric observations by Meaghann Stoelting and David DeGraffat at theStull Observatory (784) of the Alfred University in New York. Lightcurve analysis gave arotation period of16.648±0.009 hours with a brightness variation of0.33±0.02magnitude (U=2+). Assuming an equatorial view, the observers also constrained the object's elongated shape to be at least 36% longer than wide.[9] The result supersedes a tentative period determination by French amateur astronomerRené Roy from May 2007 (U=2).[11] Additional observation by the Spanish OBAS group gave a period of16.70±0.01 hours with an amplitude of0.28±0.02 magnitude (U=2/2).[12]
In 2016, a modeled lightcurve gave a concurring sidereal period of16.6868±0.0002 hours using data from the Uppsala Asteroid Photometric Catalogue, thePalomar Transient Factory survey, and individual observers (such as above), as well as sparse-in-time photometry from theNOFS, theCatalina Sky Survey, and the La Palma surveys (950). The study also determined twospin axes of (276.0°, 70.0°) and (90.0°, 39.0°) inecliptic coordinates (λ, β).[10]
According to the survey carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE),Rosalinde measures (18.78±1.4), (19.56±0.31) and (19.618±0.057) kilometers in diameter and its surface has analbedo of (0.1008±0.017), (0.096±0.004) and (0.085±0.021), respectively.[6][7][8] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.0931 and calculates a diameter of 18.75 kilometers based on anabsolute magnitude of 11.83.[13] Alternative mean-diameter measurements published by the WISE team include (18.191±5.124 km), (19.69±6.22 km) and (20.908±0.160 km) with corresponding albedos of (0.131±0.105), (0.13±0.08) and (0.0750±0.0106).[5][13] On 7 June 2015, anasteroid occultation gave a best-fit ellipse dimension of 19.0 × 19.0 kilometers. These timed observations are taken when the asteroid passes in front of a distant star.[5]
