| Discovery[1] | |
|---|---|
| Discovered by | V. Albitzkij |
| Discovery site | Simeiz Obs. |
| Discovery date | 6 November 1923 |
| Designations | |
| (1028) Lydina | |
Named after | Lydia Il'inichna Albitskaya[2] (discoverer's wife) |
| 1923 PG · A907 JF A914 JA | |
| main-belt[1] · (outer)[3][4] background[5] · Cybele[a] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.80yr (40,471 d) |
| Aphelion | 3.7695AU |
| Perihelion | 3.0454 AU |
| 3.4075 AU | |
| Eccentricity | 0.1062 |
| 6.29 yr (2,297 d) | |
| 346.68° | |
| 0° 9m 24.12s / day | |
| Inclination | 9.3940° |
| 62.833° | |
| 24.747° | |
| Physical characteristics | |
| 71.38±2.2 km[6] 81.85±21.71 km[7] 88.526±0.762 km[8] 96.830±1.081 km[9] 97.18±1.38 km[10] | |
| 11.674±0.002 h[11] 11.680±0.005 h[12] 15.69 h[13] 48±1 h(poor)[14] | |
| 0.0318±0.0054[9] 0.032±0.001[10] 0.038±0.006[8] 0.04±0.05[7] 0.0586±0.004[6] | |
| Tholen =C[3][4] B–V = 0.684[3] U–B = 0.276[3] | |
| 9.43[3][4][6][7][9][10] 10.31±0.76[15] | |
1028 Lydina, provisional designation1923 PG, is a carbonaceous backgroundasteroid and member of theCybele group from the outermost regions of theasteroid belt, approximately 82 kilometers (50 miles) in diameter. It was discovered at theSimeiz Observatory on the Crimean peninsula on 6 November 1923, by Soviet astronomerVladimir Albitsky, who named it after his wife, Lydia Il'inichna Albitskaya.[1][2] The darkC-type asteroid has a rotation period of 11.68 hours.[4]
Lydina is a non-family asteroid from the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[5] Based on osculating Keplerianorbital elements, the asteroid is considered a member of the dynamicalCybele group, which are asteroid with loworbital inclinations andeccentricities, and with asemi-major axis between 3.3 and 3.5 AU, near the 4:7orbital resonance with Jupiter.[a]
It orbits the Sun in theoutermost asteroid belt at a distance of 3.0–3.8 AU once every 6 years and 3 months (2,297 days; semi-major axis of 3.41 AU). Its orbit has aneccentricity of 0.11 and an inclination of 9° with respect to theecliptic.[3]
The body'sobservation arc begins with its first observation asA907 JF atHeidelberg Observatory in May 1907, more than 16 years prior to its official discovery observation at Simeiz.[1]
In theTholen,Lydina is a carbonaceousC-type asteroid.[3][4]
In November 2011, a rotationallightcurve ofLydina was obtained fromphotometric observations byRobert Stephens at his Santana Observatory (646) in California. Lightcurve analysis gave a well-definedrotation period of 11.680 hours with a brightness variation of 0.22magnitude (U=3).[12] Observations at the ItalianBassano Bresciano Observatory in December 2011 measured a concurring period 11.674 with an amplitude of 0.30 magnitude (U=3-).[11] A previous observations at the Pico dos Dias Observatory (874), Brasil, gave a period of 15.69 hours,[13] which Stephens interpreted as a 4:3-alias period solution of his results.[12] A provisional lightcurve from March 2007, obtained by French amateur astronomersPierre Antonini and Jean-Gabriel Bosch (48 hours) is of poor quality (U=1).[14]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Lydina measures between 71.38 and 97.18 kilometers in diameter and its surface has analbedo between 0.0318 and 0.0586.[6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0586 and a diameter of 71.38 kilometers based on anabsolute magnitude of 9.43.[4]
1028 Lydina has been observed tooccult 5 stars between 2000 and 2023.
Thisminor planet was named after Lydia Il'inichna Albitskaya, wife of the discovererVladimir Albitsky (1891–1952).[2] No accurate naming citation was given for this asteroid inThe Names of the Minor Planets. The author of theDictionary of Minor Planets,Lutz Schmadel, learned about the naming circumstances fromNikolai Chernykh (1931–2004), who was himself a prolific long-time astronomer at Nauchnij, Crimea.[2]
