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
JPL Small-Body Database Browser
Search: [ help ]  
22324 (1991 RQ9)
Classification: Main-belt Asteroid          SPK-ID: 2022324
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2208146765699108 4.4314e-08  
a 2.420498692983033 1.3627e-08 au
q 1.886017056954092 1.0797e-07 au
i 1.653137375542875 4.9297e-06 deg
node 314.4021110004815 0.00014256 deg
peri 4.809319267213913 0.00014317 deg
M 301.4253039532153 2.0133e-05 deg
tp 2459424.301631640746
(2021-Jul-28.80163164)
7.8508e-05 TDB
period 1375.484515127774
3.77
1.1616e-05
3.18e-08
d
yr
n .2617259562290006 2.2102e-09 deg/d
Q 2.954980329011973 1.6636e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1121  
   data-arc span      10482 days (28.70 yr)  
   first obs. used      1991-09-10  
   last obs. used      2020-05-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51627  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:04:31  

Additional Information
 Earth MOID = .870992 au 
 Jupiter MOID = 2.3584 au 
 T_jup = 3.480 
[ 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 14.75   n/a E2021B10  
diameter diameter 3.726 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.734 h n/a LCDB (Rev. 2020-October); 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 0.184   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

22324 (1991 RQ9)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 RQ9 = 1998 KB8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-21 06:15 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin