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 ]  
16976 (1999 AC2)
Classification: Main-belt Asteroid          SPK-ID: 2016976
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1807203095321903 1.6068e-08  
a 2.366648013062089 6.9646e-09 au
q 1.938946651587765 3.8148e-08 au
i 2.006775281468303 6.4306e-07 deg
node 204.3015214388412 1.3506e-05 deg
peri 37.93655906420346 1.3905e-05 deg
M 251.8979796360311 6.2499e-06 deg
tp 2459599.828441584736
(2022-Jan-20.32844158)
2.3873e-05 TDB
period 1329.838595860512
3.64
5.8702e-06
1.607e-08
d
yr
n .270709544090989 1.195e-09 deg/d
Q 2.794349374536413 8.2233e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      26194 days (71.72 yr)  
   first obs. used      1949-06-26  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45005  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:49:33  

Additional Information
 Earth MOID = .925212 au 
 Jupiter MOID = 2.21892 au 
 T_jup = 3.524 
[ 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 13.99   n/a E2021B10  
diameter diameter 4.131 km 0.153 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.163 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.260   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

16976 (1999 AC2)          Discovered 1999-Jan-06 by Korlevic, K. at Visnjan
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 AC2 = 1949 MM = 1993 PG5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-15 06:32 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin