1129 Neujmina

1129 Neujmina (prov. designation: 1929 PH) is an Eos asteroid from the outer regions of the asteroid belt. It was discovered on 8 August 1929, by astronomer Praskoviya Parchomenko at the Simeiz Observatory on the Crimean peninsula.[14] The stony S-type asteroid has a rotation period of 5.1 hours and measures approximately 34 kilometers (21 miles) in diameter. It was named after Soviet astronomer Grigory Neujmin.[2]

1129 Neujmina
Shape model of Neujmina from its lightcurve
Discovery [1]
Discovered byP. Parchomenko
Discovery siteSimeiz Obs.
Discovery date8 August 1929
Designations
(1129) Neujmina
Named after
Grigory Neujmin [2]
(Soviet astronomer)
1929 PH · 1926 AE
A914 WE
main-belt · (outer)
Eos [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc91.40 yr (33,384 days)
Aphelion3.2714 AU
Perihelion2.7734 AU
3.0224 AU
Eccentricity0.0824
5.25 yr (1,919 days)
204.95°
0° 11m 15.36s / day
Inclination8.6174°
269.22°
139.74°
Physical characteristics
Mean diameter
30.99±7.65 km[5]
32.57±0.72 km[6]
34.43±0.79 km[7]
34.576±0.196 km[8]
34.76±1.4 km[9]
34.80 km (derived)[3]
39.246±0.426 km[10]
5.0844±0.0006 h[11]
5.089±0.004 h[12]
7.61 h[13]
0.0999±0.0141[10]
0.12±0.11[5]
0.1216±0.010[9]
0.1270 (derived)[3]
0.133±0.007[7]
0.138±0.016[6]
10.15[3][10][13] · 10.20[1][6][7][9] · 10.33[5]

    Orbit and classification

    Neujmina is a member the Eos family (606),[4] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[15]:23 It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,919 days). Its orbit has an eccentricity of 0.08 and an inclination of 9° with respect to the ecliptic.[1] The asteroid was first identified as A914 WE at Simeiz in November 1911, followed by 1926 AE at Heidelberg in January 1926. The body's observation arc begins four weeks after its official discovery observation at Simeiz.[14]

    Naming

    This minor planet was named after Georgian–Russian astronomer Grigory Neujmin (1885–1946), a discoverer of minor planets and comets, observer at Pulkovo Observatory and college of Parchomenko at Simeiz Observatory. The naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 106). The lunar crater Neujmin was also named in his honor.[2]

    Physical characteristics

    In the Tholen classification, Neujmina is a stony S-type asteroid.[1]

    Rotation period

    In March 2011, a rotational lightcurve of Neujmina was obtained from photometric observations at the Oakley Southern Sky Observatory (E09) in Australia. Lightcurve analysis gave a well-defined rotation period of 5.0844 hours with a brightness variation of 0.20 magnitude (U=3).[11] Previous measurements in 1984 and 2008, gave a period of 5.089 and 7.61 hours with an amplitude of 0.15 and 0.06 magnitude, respectively (U=2/2).[12][13]

    Diameter and albedo

    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, Neujmina measures between 30.99 and 39.246 kilometers in diameter and its surface has an albedo between 0.0999 and 0.138.[5][6][7][8][9][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1270 and a diameter of 34.80 kilometers based on an absolute magnitude of 10.15.[3]

    References
    1. "JPL Small-Body Database Browser: 1129 Neujmina (1929 PH)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 9 September 2017.
    2. Schmadel, Lutz D. (2007). "(1129) Neujmina". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1130. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1129) Neujmina". Asteroid Lightcurve Database (LCDB). Retrieved 9 September 2017.
    4. "Asteroid 1129 Neujmina – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 30 October 2019.
    5. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 9 September 2017.
    6. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 9 September 2017.
    7. 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)
    8. 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. Retrieved 9 September 2017.
    9. 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.
    10. 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.
    11. Ditteon, Richard; West, Josh (October 2011). "Asteroid Lightcurve Analysis at the Oakley Southern Observatory: 2011 January thru April" (PDF). Minor Planet Bulletin. 38 (4): 214–217. Bibcode:2011MPBu...38..214D. ISSN 1052-8091.
    12. Carbo, Landy; Kragh, Katherine; Krotz, Jonathan; Meiers, Andrew; Shaffer, Nelson; Torno, Steven; et al. (July 2009). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory and Oakley Observatory: 2008 September and October" (PDF). Minor Planet Bulletin. 36 (3): 91–94. Bibcode:2009MPBu...36...91C. ISSN 1052-8091.
    13. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 9 September 2017.
    14. "1129 Neujmina (1929 PH)". Minor Planet Center. Retrieved 9 September 2017.
    15. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
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