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 ]  
1909 Alekhin (1972 RW2)
Classification: Main-belt Asteroid          SPK-ID: 2001909
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2255510269132269 3.5385e-08  
a 2.423306718107197 7.8336e-09 au
q 1.876727399312397 8.5798e-08 au
i 1.795684813652857 4.0807e-06 deg
node 227.4488273133981 0.00010847 deg
peri 5.743036834944481 0.00010874 deg
M 210.5544866454662 9.4669e-06 deg
tp 2459172.493886107422
(2020-Nov-18.99388611)
3.7539e-05 TDB
period 1377.878762476913
3.77
6.6812e-06
1.829e-08
d
yr
n .2612711726196098 1.2669e-09 deg/d
Q 2.969886036901998 9.6005e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2836  
   data-arc span      34168 days (93.55 yr)  
   first obs. used      1926-04-14  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47711  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:09:59  

Additional Information
 Earth MOID = .865725 au 
 Jupiter MOID = 2.03009 au 
 T_jup = 3.476 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455891.5 (2011-Nov-26.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2252327703382596 3.5267e-08  
q 1.877265451588783 8.5378e-08 au
tp 2456418.077924107881
(2013-May-05.57792411)
3.3098e-05 TDB
node 227.5043600218742 0.00010858 deg
peri 5.817770373717013 0.00010884 deg
i 1.794271942297663 4.0798e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2836  
   data-arc span      34168 days (93.55 yr)  
   first obs. used      1926-04-14  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47711  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:09:59  

Additional Information
 Jupiter MOID = 2.03009 au 
 T_jup = 3.476 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.243763555458127E-15 -3.003426728812019E-15 7.598688751824004E-14 -3.304572615439975E-15 1.909337412029367E-15 -1.219755854461372E-16
q -3.003426728812019E-15 7.289474609850687E-15 -1.546830854936416E-13 8.968188100675471E-15 -4.223135930415609E-15 3.382542159987277E-16
tp 7.598688751824004E-14 -1.546830854936416E-13 1.095471865797363E-9 -1.813902826557979E-12 2.60989593993147E-10 -2.918970047987406E-13
node -3.304572615439975E-15 8.968188100675471E-15 -1.813902826557979E-12 1.178941941768855E-8 -1.17834049996826E-8 -5.429828998213089E-12
peri 1.909337412029367E-15 -4.223135930415609E-15 2.60989593993147E-10 -1.17834049996826E-8 1.184710039269839E-8 5.356792677329023E-12
i -1.219755854461372E-16 3.382542159987277E-16 -2.918970047987406E-13 -5.429828998213089E-12 5.356792677329023E-12 1.664511958250503E-11

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 12.8   n/a MPO358645  
diameter diameter 18.681 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 148.6 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Dymock, R. (2009) Minor Planet Bull. 36, 182-183.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.060   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1909 Alekhin (1972 RW2)          Discovered 1972-Sep-04 by Zhuravleva, L. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1972 RW2 = 1926 GU = 1930 KF = 1930 KM = 1934 NZ = 1934 OC = 1941 FJ = 1960 FD = 1969 UU = 1971 DL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin