Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03440868251207265 3.621e-08  
a 3.002743086588723 2.0793e-08 au
q 2.899422653056971 1.0809e-07 au
i 6.78593071332394 4.0283e-06 deg
node 255.7757349349491 3.9432e-05 deg
peri 191.0644290240217 7.8777e-05 deg
M 144.4179425112566 6.8555e-05 deg
tp 2457838.079889724665
(2017-Mar-25.57988972)
0.00036064 TDB
period 1900.534205974628
5.20
1.974e-05
5.405e-08
d
yr
n .1894204265665324 1.9675e-09 deg/d
Q 3.106063520120476 2.1508e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1080  
   data-arc span      8154 days (22.32 yr)  
   first obs. used      1997-01-09  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52716  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:36:54  

Additional Information
 Earth MOID = 1.91577 au 
 Jupiter MOID = 2.03439 au 
 T_jup = 3.241 
[ 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-January); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-22 05:34 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin