1129 Neujmina is a dark, carbonaceous asteroid from the outer region of the main asteroid belt. It was discovered on 31 March 1929 by the German astronomer Karl Reinmuth at the Heidelberg Observatory in Germany. The asteroid’s provisional designation was 1929 SJ.
Orbital characteristics
- Semi‑major axis: ~3.06 AU
- Orbital period: ~5.35 years (≈1,955 days)
- Eccentricity: ~0.09
- Inclination: ~7° to the ecliptic plane
Physical properties
- Spectral type: C‑type (carbonaceous)
- Diameter: Approximately 50–60 km (estimates based on infrared surveys)
- Absolute magnitude (H): ~9.7
Naming
The minor planet was named in honor of the Russian (Soviet) astronomer Grigory Nikolayevich Neujmin (1867 – 1946), noted for his discoveries of numerous comets and minor planets. The feminine form “Neujmina” follows the convention of assigning the feminine ending –a to asteroid names derived from surnames ending in –min.
Observational history
Since its discovery, 1129 Neujmina has been observed through photometric and spectroscopic studies that confirm its low albedo and dark surface typical of C‑type asteroids. Its rotation period has been determined from light‑curve analyses, yielding a period of roughly 12 hours (subject to refinement by ongoing observations).
Classification
1129 Neujmina is classified as a non‑family background asteroid within the main belt, meaning it does not belong to any identified collisional asteroid family.
All data presented are drawn from standard astronomical catalogs and peer‑reviewed publications regarding minor planets.
