Astronomy:1122 Neith

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1122 Neith
Discovery[1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date17 September 1928
Designations
(1122) Neith
Pronunciation/ˈniːɪθ/
Named afterNeith (Egyptian mythology)[2]
1928 SB · 1941 YH
1953 OA · A924 VA
Minor planet categorymain-belt · (middle)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.01 yr (33,971 days)
|{{{apsis}}}|helion}}3.2763 AU
|{{{apsis}}}|helion}}1.9347 AU
2.6055 AU
Eccentricity0.2575
Orbital period4.21 yr (1,536 days)
Mean anomaly30.680°
Mean motion0° 14m 3.48s / day
Inclination4.7381°
Longitude of ascending node63.385°
328.96°
Physical characteristics
Dimensions11.566±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
Rotation period12.599±0.006 h[10]
Geometric albedo0.206±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]
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]


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]

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 ({{{1}}}).[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. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1122 Neith (1928 SB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001122. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1122) Neith. Springer Berlin Heidelberg. p. 95. ISBN 978-3-540-00238-3. https://books.google.com/books?id=aeAg1X7afOoC&dq=1122+Neith&pg=PA94. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (1122) Neith". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1122%7CNeith. 
  4. ↑ 4.0 4.1 "Asteroid 1122 Neith – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1122. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. 
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  7. ↑ 7.0 7.1 7.2 7.3 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1051/0004-6361/201321375. Bibcode: 2015A&A...578A..42R. 
  9. ↑ 9.0 9.1 9.2 9.3 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. ↑ 10.0 10.1 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. ISSN 1052-8091. Bibcode: 2009MPBu...36..162O. 
  11. ↑ 11.0 11.1 11.2 11.3 Fornasier, S.; Clark, B. E.; Dotto, E. (July 2011). "Spectroscopic survey of X-type asteroids". Icarus 214 (1): 131–146. doi:10.1016/j.icarus.2011.04.022. Bibcode: 2011Icar..214..131F. 
  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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. 
  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. ISSN 1052-8091. Bibcode: 2009MPBu...36..140F. 
  14. ↑ that is, pronounced with two syllables, NEE-ith.
  15. ↑ 15.0 15.1 "1122 Neith (1928 SB)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1122. 

External links



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