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128 Nemesis

Main-belt asteroid

Field	Value
minorplanet	yes
image	128 Nemesis VLT (2021), deconvolved.pdf
background	#D6D6D6
name	128 Nemesis
discovery_ref
discoverer	James Craig Watson
discovered	25 November 1872
mpc_name	(128) Nemesis
alt_names	A872 WA;
pronounced
adjective	Nemesian
named_after	Nemesis
mp_category	main-beltNemesis
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	144.93 yr (52,934 d)
aphelion	3.0996 AU
perihelion	2.3998 AU
semimajor	2.7497 AU
eccentricity	0.1272
period	1665 days
mean_anomaly	345.49°
mean_motion	/ day
inclination	6.2453°
asc_node	76.243°
arg_peri	303.82°
mean_diameter

flattening	0.17
mass

density

rotation	77.81 h
38.9325 h
albedo	0.067 (calculated)

spectral_type	Tholen C
SMASS C
abs_magnitude	7.70

38.9325 h

SMASS C

128 Nemesis is a large 180 km main-belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about 78 hours to complete one rotation. Nemesis is the largest member of the Nemesian asteroid family bearing its name. It was discovered by J. C. Watson on 25 November 1872, and named after Nemesis, the goddess of retribution in Greek mythology.

thumb|left|Diagram of Nemesis's orbit This object is orbiting the Sun with a period of 1665 days and an eccentricity (ovalness) of 0.13. The orbital plane is inclined by 6.2° to the plane of the ecliptic. It is categorized as a C-type asteroid, indicating a primitive carbonaceous composition. Based on IRAS data Nemesis is about 188 km in diameter and is around the 33rd largest main-belt asteroid, while WISE measurements yield a size of ~163 km. The 77.81‑hour rotation period is the second longest for an asteroid more than 150 km in diameter.

Between 2005 and 2021, Nemesis has been observed to occult eight stars.

Notes

References

|display-authors = 6

|display-authors=1 |url-status=dead

References

{{OED. Nemesis
Hornum (1993) ''Nemesis, the Roman state and the games''
Peery (1963) ''Studies in the Renaissance'', vol. 10
P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. ''Astronomy & Astrophysics'' 54, A56

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