| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 29 April 2000 |
| Designations | |
| (32008) Adriángalád | |
Named after | Adrián Galád[1] (Slovak astronomer) |
| 2000 HM53 · 1994 PZ39 | |
| main-belt[1][2] · background[3][4] binary[5] | |
| Orbital characteristics[2] | |
| Epoch 1 July 2021 (JD 2459396.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 29.37yr (10,728 d) |
| Aphelion | 2.6145AU |
| Perihelion | 1.7700 AU |
| 2.1923 AU | |
| Eccentricity | 0.1926 |
| 3.25 yr (1,186 d) | |
| 70.001° | |
| 0° 18m 12.96s / day | |
| Inclination | 6.3038° |
| 221.81° | |
| 144.08° | |
| Knownsatellites | 1(D:1.62 km;P:40.24 h)[3][6] |
| Physical characteristics | |
| 4.04 km(primary)[3] 4.35 km(effective)[3] | |
| 3.0171±0.0001 h[6] | |
| 0.16(assumed)[3] 0.24(assumed)[7] | |
| V(SDSS-MOC)[3][8] | |
| 14.17±0.01(R)[6] 14.58[1][2] 14.73±0.103[7][9] | |
32008 Adriángalád (provisional designation2000 HM53) is a backgroundasteroid and synchronousbinary system from the inner regions of theasteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 29 April 2000, by astronomers with theLINEAR program atLincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. TheV-type asteroid has arotation period of 3.0 hours. It was named for Slovak astronomerAdrián Galád.[1] Its 1.6-kilometer sizedminor-planet moon was discovered in August 2007.[5]
Adriángalád is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[3][4] Based on osculating Keplerianorbital elements, the asteroid is located in the densely populated region of theFlora family (402), a giantfamily orclan of stony bodies in the innerasteroid belt.[7]
It orbits the Sun in theinner main-belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,186 days;semi-major axis of 2.19 AU). Its orbit has aneccentricity of 0.19 and aninclination of 6° with respect to theecliptic.[2] The body'sobservation arc begins almost 9 years prior to its official discovery observation, with aprecovery taken by theSteward Observatory'sSpacewatch survey atKitt Peak in November 1991.[1]
Thisminor planet was named after Slovak astronomerAdrián Galád (born 1970) adiscoverer of minor planets and several binary asteroids himself. He is well known for hisphotometric observations at bothOndřejov andModra observatories.[1] The officialnaming citation was published by theMinor Planet Center on 20 June 2016 (M.P.C. 100607).[10]
In theSDSS-based taxonomy, Adriángalád has been characterized as a brightV-type asteroid.[3][8]
A rotationallightcurve of Adriángalád was obtained fromphotometric observations in the R-band by Czech astronomerPetr Pravec at theOndřejov Observatory in August 2007. The lightcurve gave a well-definedrotation period of3.0171±0.0001 hours with a brightness amplitude of 0.19 inmagnitude (U=3).[6][7]
During Pravec's photometric observations it was revealed that Adriángalád is a synchronousbinary system, with aminor-planet moon orbiting it every40.24±0.02 hours.[6] The satellite measures approximately 40% of that of its primary,[6] with published diameters of 1.62 and 1.69 kilometers, respectively.[3][5] The companion orbits its primary at an estimated average distance of 13 kilometers only.[5]
A combined effective diameter of 4.35 kilometers for the system has been published based on secondary-to-primary diameter-ratio of 0.40, that is, 4.04 km for the primary, and 1.62 km for the secondary. The assumedalbedo for the primary is 0.16.[3] Johnston's archive uses the same ratio of 0.40 and estimates and effective diameter of 4.56 kilometers with 4.23 and 1.69 kilometers for the primary and secondary, respectively.[5] TheCollaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.24 – derived from8 Flora, the Flora family's largest member – and calculates a diameter of 3.07 kilometers with anabsolute magnitude of 14.73.[7]
