1028 Lydina

1028 Lydina, provisional designation 1923 PG, is a carbonaceous background asteroid and member of the Cybele group from the outermost regions of the asteroid belt, approximately 82 kilometers (50 miles) in diameter. It was discovered at the Simeiz Observatory on the Crimean peninsula on 6 November 1923, by Soviet astronomer Vladimir Albitsky, who named it after his wife, Lydia Il'inichna Albitskaya.[1][2] The dark C-type asteroid has a rotation period of 11.68 hours.[4]

1028 Lydina
Discovery [1]
Discovered byV. Albitzkij
Discovery siteSimeiz Obs.
Discovery date6 November 1923
(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 arc110.80 yr (40,471 d)
Aphelion3.7695 AU
Perihelion3.0454 AU
3.4075 AU
6.29 yr (2,297 d)
0° 9m 24.12s / day
Physical characteristics
Mean diameter
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]
Tholen = C[3][4]
B–V = 0.684[3]
U–B = 0.276[3]

Orbit and classificationEdit

Lydina is a non-family asteroid from the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5] Based on osculating Keplerian orbital elements, the asteroid is considered a member of the dynamical Cybele group, which are asteroid with low orbital inclinations and eccentricities, and with a semi-major axis between 3.3 and 3.5 AU, near the 4:7 orbital resonance with Jupiter.[a]

It orbits the Sun in the outermost 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 an eccentricity of 0.11 and an inclination of 9° with respect to the ecliptic.[3]

The body's observation arc begins with its first observation as A907 JF at Heidelberg Observatory in May 1907, more than 16 years prior to its official discovery observation at Simeiz.[1]

Physical characteristicsEdit

In the Tholen, Lydina is a carbonaceous C-type asteroid.[3][4]

Rotation periodEdit

In November 2011, a rotational lightcurve of Lydina was obtained from photometric observations by Robert Stephens at his Santana Observatory (646) in California. Lightcurve analysis gave a well-defined rotation period of 11.680 hours with a brightness variation of 0.22 magnitude (U=3).[12] Observations at the Italian Bassano 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 astronomers Pierre Antonini and Jean-Gabriel Bosch (48 hours) is of poor quality (U=1).[14]

Diameter and albedoEdit

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Lydina measures between 71.38 and 97.18 kilometers in diameter and its surface has an albedo between 0.0318 and 0.0586.[6][7][8][9][10]

The Collaborative 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 an absolute magnitude of 9.43.[4]


This minor planet was named after Lydia Il'inichna Albitskaya, wife of the discoverer Vladimir Albitsky (1891–1952).[2] No accurate naming citation was given for this asteroid in The Names of the Minor Planets. The author of the Dictionary of Minor Planets, Lutz Schmadel, learned about the naming circumstances from Nikolai Chernykh (1931–2004), who was himself a prolific long-time astronomer at Nauchnij, Crimea.[2]


  1. ^ a b See online excerpt of Linda T. Elkins-Tanton's book Asteroids, meteorites, and comets (2011); and orbital criteria in Minor planet groups/families by projectpluto.com. Also see comment at Asteroid family § Cybele group.


  1. ^ a b c d "1028 Lydina (1923 PG)". Minor Planet Center. Retrieved 16 March 2018.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1028) Lydina". Dictionary of Minor Planet Names – (1028) Lydina. Springer Berlin Heidelberg. p. 88. doi:10.1007/978-3-540-29925-7_1029. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g h "JPL Small-Body Database Browser: 1028 Lydina (1923 PG)" (2018-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 16 March 2018.
  4. ^ a b c d e f "LCDB Data for (1028) Lydina". Asteroid Lightcurve Database (LCDB). Retrieved 16 March 2018.
  5. ^ a b "Asteroid 1028 Lydina – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 24 October 2019.
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  7. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 16 March 2018.
  8. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  9. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  10. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  11. ^ a b Strabla, Luca; Quadri, Ulisse; Girelli, Roberto (July 2012). "Lightcurve Analysis for Eight Minor Palnets at Bassano Bresciano Observatory". The Minor Planet Bulletin. 39 (3): 177–179. Bibcode:2012MPBu...39..177S. ISSN 1052-8091. Retrieved 16 March 2018.
  12. ^ a b c Stephens, Robert D. (April 2012). "Asteroids Observed from GMARS and Santana Observatories: 2011 October- December". The Minor Planet Bulletin. 39 (2): 80–82. Bibcode:2012MPBu...39...80S. ISSN 1052-8091. Retrieved 16 March 2018.
  13. ^ a b Almeida, R.; Angeli, C. A.; Duffard, R.; Lazzaro, D. (February 2004). "Rotation periods for small main-belt asteroids". Astronomy and Astrophysics. 415: 403–406. Bibcode:2004A&A...415..403A. doi:10.1051/0004-6361:20034585. Retrieved 16 March 2018.
  14. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1028) Lydina". Geneva Observatory. Retrieved 16 March 2018.
  15. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 16 March 2018.

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