5751 Zao

5751 Zao

Infobox Planet
minorplanet = yes
width = 25em
bgcolour = #FFFFC0
apsis =
name = Zao
symbol =


caption =
discovery = yes
discovery_ref =
discoverer = M. Koishikawa
discovery_site = Ayashi Station
discovered = January 05, 1992
designations = yes
mp_name = 5751
alt_names = 1992 AC
mp_category = Amor
orbit_ref = [Cite web | title = JPL Small-Body Database Browser on 5751 Zao | pulisher = NASA | url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=5751+Zao]
epoch = May 14, 2008
aphelion = 2.993785803 ± 2.114e-08 AU
perihelion = 1.21607607 ± 1.6591e-07 AU
semimajor = 2.104930938 ± 1.4863e-08 AU
eccentricity = .422272697 ± 7.6573e-08
period = 1115.463089 ± 1.1815e-05 d
avg_speed =
inclination = 16.0689199 ± 8.3868e-06°
asc_node = 121.723507 ± 1.6679e-05°
mean_anomaly = 115.323764 ± 2.5873e-05°
arg_peri = 25.210457 ± 2.605e-05°
satellites =
physical_characteristics = yes
dimensions = 2.3 km
mass =
density =
surface_grav =
escape_velocity =
sidereal_day =
axial_tilt =
pole_ecliptic_lat =
pole_ecliptic_lon =
albedo = 0.36
rotation = 76 hr
temperatures=
temp_name1 =
mean_temp_1 =
max_temp_1 =
temp_name2 =
max_temp_2 =
spectral_type =
abs_magnitude = 14.8

5751 Zao also designated 1992 AC is an Amor asteroid discovered on January 05, 1992 by M. Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory.

Physical properties

5751 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.Cite journal | title = The Near-Earth Objects Follow-Up Program | first = P. | last = Pravec | coauthors = et al. | journal = Icarus | date = December 1997 | volume = 130 | issue = 2 | pages = 275–286 | url = http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-45SJBFT-5&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=b74415a70313fc51e07a8a4fa4f16f12 | doi = 10.1006/icar.1997.5816] Another group led by Wisniewski conducted an approximately 5 hour observation and were unable to conclude a rotational period.Cite journal | title = Photometric Observations of 125 Asteroids | first = W. Z. | last = Wisniewski | coauthors = MichaŁowski, T. M.; Harris, A. W.; McMillan, R. S.| date = April 1997 | journal = Icarus | volume = 126 | issue = 2 | pages = 395–449 | url = http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-45MFXKD-F&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d73373bbd760d9a8ea115efdaa2a59b2 | doi = 10.1006/icar.1996.5665] 5751 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.Cite journal | title = Keck observations of near-Earth asteroids in the thermal infrared | first = Marco | last = Delbó | coauthors = Harris, Alan W.; Binzel, Richard P.; Pravec, Petr; Davies, John K. | date = November 2003 | journal = Icarus | volume = 166 | issue = 1 | pages = 116–130 | url = http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-49KH00F-3&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=08097bf4771903e0aaf6b7aa2933b06c | doi = 10.1016/j.icarus.2003.07.002] Using the asteroid's albedo and the Near Earth Asteroid Thermal Model (NEATM) the asteroid's diameter was estimated to be 2.3 km. Further study of the asteroid by the Ondrejov Asteroid Photometry Project concludes that a rotational period of 76 hours is consistent with earlier measurements.Cite web | title = Ondrejov Asteroid Photometry Project: Summary of Prepublished Data | url = http://www.asu.cas.cz/~ppravec/neo.html] Cite web | title = 5751 Zao | publisher = European Asteroid Research Node | url = http://earn.dlr.de/nea/005751.htm]

External links

* [http://www.cfa.harvard.edu/iauc/05400/05426.html IAUC 5426 - Initial discovery]
* [http://www.cfa.harvard.edu/iauc/05400/05442.html IAUC 5442 - Refined orbital elements]
* [http://www.cfa.harvard.edu/iauc/05400/05474.html IAUC 5474 - Extension to ephemeris]
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=5751+Zao JPL Small-Body Database Browser on 5751 Zao]

References


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