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 ]  
1375 Alfreda (1935 UB)
Classification: Main-belt Asteroid          SPK-ID: 2001375
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 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07123348784824905 1.4774e-08  
a 2.447582400278163 6.5301e-09 au
q 2.27323256911036 3.7656e-08 au
i 5.819253908350929 8.6845e-07 deg
node 52.75810400424808 4.6894e-06 deg
peri 32.70341957342475 1.1675e-05 deg
M 47.49459150709289 1.2003e-05 deg
tp 2459015.978887079966
(2020-Jun-15.47888708)
4.6577e-05 TDB
period 1398.635055978779
3.83
5.5973e-06
1.532e-08
d
yr
n .2573938058116729 1.0301e-09 deg/d
Q 2.621932231445965 6.9953e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3061  
   data-arc span      32661 days (89.42 yr)  
   first obs. used      1931-10-12  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39845  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:21:50  

Additional Information
 Earth MOID = 1.29115 au 
 Jupiter MOID = 2.51877 au 
 T_jup = 3.487 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456989.5 (2014-Nov-28.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07014089530200024 1.4731e-08  
q 2.275958488086366 3.7485e-08 au
tp 2457614.584984437001
(2016-Aug-14.08498444)
4.732e-05 TDB
node 52.78648606509524 4.6893e-06 deg
peri 32.00537846266369 1.1847e-05 deg
i 5.819800188539552 8.6872e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3061  
   data-arc span      32661 days (89.42 yr)  
   first obs. used      1931-10-12  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39845  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:21:50  

Additional Information
 Jupiter MOID = 2.51877 au 
 T_jup = 3.487 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.169961009453239E-16 -5.451113893373724E-16 -2.037081498128527E-13 1.981877931524849E-14 -5.078984167650325E-14 -2.916613159123881E-15
q -5.451113893373724E-16 1.405099838188798E-15 4.820938822933768E-13 -4.925663964602914E-14 1.17116115525251E-13 7.197235897372056E-15
tp -2.037081498128527E-13 4.820938822933768E-13 2.239190300021214E-9 3.578005814114879E-11 5.221760426685717E-10 -9.766419249683586E-12
node 1.981877931524849E-14 -4.925663964602914E-14 3.578005814114879E-11 2.19892887021648E-11 -1.034946281962477E-11 -2.885097703744908E-12
peri -5.078984167650325E-14 1.17116115525251E-13 5.221760426685717E-10 -1.034946281962477E-11 1.40344621086421E-10 -1.708651923208131E-14
i -2.916613159123881E-15 7.197235897372056E-15 -9.766419249683586E-12 -2.885097703744908E-12 -1.708651923208131E-14 7.546800675943527E-13

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 11.52   n/a E2021B10  
diameter diameter 13.928 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.14 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pligge, Z.; Monnier, A.; Pharo, J.; Stolze, K.; Yim, A.; Ditteon, R. (2011) Minor Planet Bull. 38, 5-7.]
geometric albedo albedo 0.204   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1375 Alfreda (1935 UB)          Discovered 1935-Oct-22 by Delporte, E. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2159-Jan-02 16:08 00:02 Vesta 0.0243040084270874 0.0242935506215197 0.0243144664932036 3.40847609395824 3.40847465762066 2509620.172393264 1.7624932722882 532.796147188259 39.869409977487 -13.4740300714905 22126.7397139009 T 46 CATAB v2.0f-lin.ifort 2021-Apr-12 12:22:42 2021-Apr-12 12:22

Alternate Designations
 1935 UB = 1931 TV3 = 1933 FC = A916 WK 
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-13 08:50 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin