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 ]  
27757 (1991 PO18)
Classification: Main-belt Asteroid          SPK-ID: 2027757
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2130463247817639 3.3591e-08  
a 2.249746542629329 7.0603e-09 au
q 1.77044631003167 7.3999e-08 au
i 5.660634935369401 4.3053e-06 deg
node 345.022326812861 3.3205e-05 deg
peri 291.3466647575746 3.4984e-05 deg
M 228.6287956973709 1.2712e-05 deg
tp 2459450.276226893857
(2021-Aug-23.77622689)
4.4239e-05 TDB
period 1232.533739348145
3.37
5.8021e-06
1.589e-08
d
yr
n .2920812538489977 1.3749e-09 deg/d
Q 2.729046775226987 8.5645e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2090  
   data-arc span      16666 days (45.63 yr)  
   first obs. used      1974-06-17  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47669  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:09:37  

Additional Information
 Earth MOID = .763935 au 
 Jupiter MOID = 2.42902 au 
 T_jup = 3.591 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.0   n/a MPO395273  
diameter diameter 3.553 km 0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.463   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27757 (1991 PO18)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 PO18 = 1998 SQ121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-04 00:49 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin