_Bodea.png) Modelled shape ofBodea from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 6 August 1923 |
| Designations | |
| (998) Bodea | |
| Pronunciation | /ˈboʊdiə/ |
Named after | Johann Elert Bode (German astronomer)[2] |
| A923 PC · 1967 PA 1923 NU | |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 96.34yr (35,187 d) |
| Aphelion | 3.7826AU |
| Perihelion | 2.4547 AU |
| 3.1187 AU | |
| Eccentricity | 0.2129 |
| 5.51 yr (2,012 d) | |
| 89.259° | |
| 0° 10m 44.4s / day | |
| Inclination | 15.505° |
| 301.18° | |
| 72.139° | |
| Physical characteristics | |
| 8.574 h[10][a] | |
| (7.0°, −59.0°)(λ/β)[5][11] | |
| C(assumed)[12] | |
| 11.5[1][3] | |
998 Bodea (prov. designation:A923 PCor1923 NU) is a darkbackground asteroid from the outer regions of theasteroid belt, approximately 32 kilometers (20 miles) in diameter. It was discovered on 6 August 1923, by astronomerKarl Reinmuth at theHeidelberg Observatory in southern Germany.[1] The presumedC-type asteroid with an irregular shape has arotation period of 8.6 hours. It was named after German astronomerJohann Elert Bode (1747–1826).
Bodea is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5][6] It orbits the Sun in theouter asteroid belt at a distance of 2.5–3.8 AU once every 5 years and 6 months (2,012 days;semi-major axis of 3.12 AU). Its orbit has aneccentricity of 0.21 and aninclination of 16° with respect to theecliptic.[3] The body'sobservation arc begins at Heidelberg on 8 August 1923, just two days after its official discovery observation.[1]
Thisminor planet was named afterJohann Elert Bode (1747–1826), German astronomer, author of theBerliner Astronomisches Jahrbuch, known for the empiricalTitius–Bode law about the sequence of planetary distances. Bode also was the director of the Berlin Observatory in 1780. The asteroid's name was proposed by Swedish astronomer Bror Asplind(see citation for958 Asplinda). The officialnaming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 95). The lunar craterBode is also named in his honor.[2]
Bodea is an assumedC-type asteroid.[12] Due to its very lowalbedo of 0.03 or less, it could also be aP- orD-type asteroid which are very common in the outer asteroid belt and among theJupiter trojan population.
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In September 2006, a rotationallightcurve ofBodea was obtained fromphotometric observations by Italian astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station (A12). Lightcurve analysis gave a well definedrotation period of8.574±0.001 hours with a relatively high brightness amplitude of0.68±0.01magnitude (U=3), which is indicative of an elongated, irregular shape.[10][12][a]
Modeled photometric data from the Lowell Photometric Database (LPD) andWISE thermal data, gave a concurring sidereal rotation period of 8.57412 hours. Each modeled lightcurve also determined the object'sspin axes. Durech gives only one pole, namely (7.0°, −59.0°), while Hanus determined two lower rated poles at (336.0°, −70.0°) and (72.0°, −56.0°) inecliptic coordinates (λ, β).[5][11][13]
According to the survey carried out by theNEOWISE mission of NASA's WISE telescope,Bodea measures31.761±0.497 kilometers in diameter and its surface has analbedo of0.030±0.001.[8] Results from the JapaneseAkari satellite are in agreement with31.21±0.39 km and an albedo of0.030±0.001.[7] Only the Infrared Astronomical SatelliteIRAS gave a larger diameter of38.16±3.1 km and, correspondingly, a lower albedo of0.0211±0.004.[9] TheCollaborative Asteroid Lightcurve Link adopts an albedo of 0.0304 and derives a diameter of 38.23 kilometers based on anabsolute magnitude of 11.5.[12]
