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18550 Maoyisheng (1997 AN14)
Classification: Main-belt Asteroid          SPK-ID: 2018550
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03404260048300812 3.4852e-08  
a 3.003535964350375 2.0374e-08 au
q 2.901287789479649 1.027e-07 au
i 6.778249544703431 3.9502e-06 deg
node 255.7410759866455 3.3945e-05 deg
peri 194.5154193797884 7.1476e-05 deg
M 216.518126607014 6.4474e-05 deg
tp 2459758.278395795967
(2022-Jun-27.77839580)
0.0003427 TDB
period 1901.287013024767
5.21
1.9345e-05
5.296e-08
d
yr
n .1893454263000904 1.9266e-09 deg/d
Q 3.105784139221102 2.1067e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1177  
   data-arc span      8541 days (23.38 yr)  
   first obs. used      1997-01-09  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52099  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:23:30  

Additional Information
 Earth MOID = 1.91817 au 
 Jupiter MOID = 2.02655 au 
 T_jup = 3.240 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8   n/a MPO347669  
diameter diameter 9.287 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.810 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.068   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18550 Maoyisheng           Discovered 1997 Jan. 9 by the Beijing Schmidt CCD Asteroid Program at Xinglong.
Yisheng Mao (1896-1989) was a world-renowned scientist and one of the founders of modern bridge engineering of China. In the 1930s, he designed and supervised the construction of the Qiantang River Bridge, which is the first bridge of its kind ever designed and built by the Chinese.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010804/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1997 AN14 = 1998 HX97 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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