1122 Neith

1122 Neith /ˈniːɪθ/,^[14] provisional designation 1928 SB, is a background asteroid from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 17 September 1928.^[15] The asteroid was named after the goddess Neith from Egyptian mythology.^[2]

1122 Neith

Discovery[1]
Discovered by	E. Delporte
Discovery site	Uccle Obs.
Discovery date	17 September 1928
Designations
MPC designation	(1122) Neith
Pronunciation	/ˈniːɪθ/
Named after	Neith (Egyptian mythology)[2]
Alternative designations	1928 SB · 1941 YH 1953 OA · A924 VA
Minor planet category	main-belt · (middle)[3] background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	93.01 yr (33,971 days)
Aphelion	3.2763 AU
Perihelion	1.9347 AU
Semi-major axis	2.6055 AU
Eccentricity	0.2575
Orbital period (sidereal)	4.21 yr (1,536 days)
Mean anomaly	30.680°
Mean motion	0° 14m 3.48s / day
Inclination	4.7381°
Longitude of ascending node	63.385°
Argument of perihelion	328.96°
Physical characteristics
Dimensions	11.566±0.261 km[5][6] 11.73 km (derived)[3] 12.01±0.5 km[7] 13.453±1.632 km[8] 13.81±0.73 km[9] 13.84±1.46 km (MSX)[9]: 34
Synodic rotation period	12.599±0.006 h[10]
Geometric albedo	0.206±0.048[8] 0.2756 (derived)[3] 0.2836±0.0435[6] 0.284±0.043[5] 0.34[9] 0.4450±0.044[7]
Spectral type	A[11] · S (assumed)[3]
Absolute magnitude (H)	11.10[7][8] · 11.67[3][6] · 11.7[1] · 11.71±0.49[12] · 11.9[13]

Orbit and classification

Neith is a non-family asteroid from the main belt's background population.^[4] It orbits the Sun in the central asteroid belt at a distance of 1.9–3.3 AU once every 4 years and 3 months (1,536 days; semi-major axis of 2.61 AU). Its orbit has an eccentricity of 0.26 and an inclination of 5° with respect to the ecliptic.^[1] The body's observation arc begins with its observation as A924 VA at Heidelberg Observatory in November 1924, almost four years prior to its official discovery observation at Uccle.^[15]

Physical characteristics

Neith has been characterized as an uncommon A-type asteroid during a spectroscopic survey after it had previously been classified as X-type in the Tholen taxonomy.^[11] The asteroid's surface shows a strong 0.96 μm absorption band (depth of 24%) and a steep slope in the near-infrared region, typical of olivine-rich bodies.^[11] The survey was conducted at the NTT, TNG and IRTF telescopes during 2004–2007.^[11]

Rotation period

In September 2008, a rotational lightcurve of Neith was obtained from photometric observations by Julian Oey at the Leura and Kingsgrove Observatory in Australia. Lightcurve analysis gave a synodic rotation period of 12.5990 hours with a brightness variation of 0.08 magnitude (U=2).^[10]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS (SIMPS and MSX), the Spitzer Space Telescope (MIPS photometer and MIPSGAL survey) and the NEOWISE mission of the Wide-field Infrared Survey Explorer, Neith measures between 11.566 and 13.84 kilometers in diameter and its surface has an albedo between 0.206 and 0.4450.^{[5][6][7][8][9]: 34}

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2756 and a diameter of 11.73 kilometers based on an absolute magnitude of 11.67.^[3]

Naming

This minor planet was named from Egyptian mythology after the goddess of Libyan origin, Neith, goddess of the hunt and of war, believed to be the mother of the Sun. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 105).^[2]

References

1. "JPL Small-Body Database Browser: 1122 Neith (1928 SB)" (2017-11-27 last obs.). Jet Propulsion Laboratory. Retrieved 25 January 2018.
2. Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1122) Neith. Springer Berlin Heidelberg. p. 95. ISBN 978-3-540-00238-3.
3. "LCDB Data for (1122) Neith". Asteroid Lightcurve Database (LCDB). Retrieved 25 January 2018.
4. "Asteroid 1122 Neith – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.
6. 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. S2CID 118700974.
7. 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.
8. Ryan, E. L.; Mizuno, D. R.; Shenoy, S. S.; Woodward, C. E.; Carey, S. J.; Noriega-Crespo, A.; et al. (June 2015). "The kilometer-sized Main Belt asteroid population revealed by Spitzer". Astronomy and Astrophysics. 578: 12. arXiv:1204.1116. Bibcode:2015A&A...578A..42R. doi:10.1051/0004-6361/201321375. S2CID 21069867.
9. Ryan, Erin Lee; Mizuno, Donald R.; Shenoy, Sachindev S.; Woodward, Charles E.; Carey, Sean; Noriega-Crespo, Alberto; et al. (April 2012). "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer". arXiv:1204.1116 [astro-ph.EP].
10. Oey, Julian (October 2009). "Lightcurve Analysis of Asteroids from Leura and Kingsgrove Observatory in the Second Half of 2008". The Minor Planet Bulletin. 36 (4): 162–164. Bibcode:2009MPBu...36..162O. ISSN 1052-8091.
11. Fornasier, S.; Clark, B. E.; Dotto, E. (July 2011). "Spectroscopic survey of X-type asteroids". Icarus. 214 (1): 131–146. arXiv:1105.3380. Bibcode:2011Icar..214..131F. doi:10.1016/j.icarus.2011.04.022. S2CID 118549118.
12. 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. S2CID 53493339.
13. Faure, Gerard; Garrett, Lawrence (October 2009). "Suggested Revised H Values of Selected Asteroids: Report Number 4". The Minor Planet Bulletin. 36 (4): 140–143. Bibcode:2009MPBu...36..140F. ISSN 1052-8091.
14. that is, pronounced with two syllables, NEE-ith.
15. "1122 Neith (1928 SB)". Minor Planet Center. Retrieved 25 January 2018.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1122 Neith at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1122 Neith at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters