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5751 Zao

Near-Earth asteroid

Near-Earth asteroid

FieldValue
minorplanetyes
background#FFC2E0
name5751 Zao
discovery_ref
discovererM. Koishikawa
discovery_siteAyashi Station
discovered5 January 1992
mpc_name(1992) AC
alt_namesMPO 319156, 1989 EN1
named_afterMount Zaō
mp_category
NEO
orbit_ref
uncertainty0
epoch13 January 2016 (JD 2457400.5)
observation_arc9792 days (26.81 yr)
aphelion2.994076221 AU
perihelion1.21174819 AU
semimajor2.102912204 AU
eccentricity0.423776140
period3.05 yr (1113.9 d)
inclination16.0739405°
asc_node121.691193°
mean_anomaly300.120144°
mean_motion/ day
arg_peri25.2587992°
moid0.244159 AU
mean_diameter
rotation76 h
albedo0.36
abs_magnitude14.8

NEO

5751 Zao, provisional designation , is an Amor asteroid discovered by Japanese astronomer M. Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory on 5 January 1992

Physical properties

Zao has been observed by several groups to determine its rotational period. Its light curve was observed by Pravec, et al. between 1992 and 1995 with the intention of determining its rotational period. From its nearly constant brightness it was determined that the asteroid is roughly spherical and has a rotational period of ≥ 21.7 hr. Another group led by Wisniewski conducted an approximately 5 hour observation and were unable to conclude a rotational period. Zao was again observed in 2001 by Delbó, et al. using the Keck telescope. They were able to determine the asteroid's albedo of 0.36 and re-classify the asteroid from X-type to E-type. Using the asteroid's albedo and the Near Earth Asteroid Thermal Model (NEATM) the asteroid's diameter was estimated to be 2.3 km.

References

References

  1. "(5751) Zao = 1992 AC = 1989 EN1". [[Minor Planet Center]].
  2. "5751 Zao (1992 AC)". [[NASA]]/[[Jet Propulsion Laboratory]].
  3. Pravec, P.. (December 1997). "The Near-Earth Objects Follow-Up Program". [[Icarus (journal).
  4. Wisniewski, W. Z.. (April 1997). "Photometric Observations of 125 Asteroids". [[Icarus (journal).
  5. Delbó, Marco. (November 2003). "Keck observations of near-Earth asteroids in the thermal infrared". [[Icarus (journal).
  6. "5751 Zao". European Asteroid Research Node.
  7. "Ondrejov Asteroid Photometry Project: Summary of Prepublished Data".
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