+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1507 Vaasa (1939 RD) Classification: Main-belt Asteroid          SPK-ID: 2001507 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2448476907859116 4.008e-08   a 2.330971110641437 8.8265e-09 au q 1.760238216912209 9.2999e-08 au i 9.226828728678306 4.3131e-06 deg node 292.804636874716 2.4362e-05 deg peri 50.49700403456853 2.6058e-05 deg M 250.6784837748098 1.3602e-05 deg tp 2459395.236157413227 (2021-Jun-29.73615741) 5.0893e-05 TDB period 1299.88150160707 3.56 7.3833e-06 2.021e-08 d yr n .2769483214854004 1.5731e-09 deg/d Q 2.901704004370665 1.0988e-08 au   Orbit Determination Parameters    # obs. used (total)      1850      data-arc span      22884 days (62.65 yr)      first obs. used      1957-11-25      last obs. used      2020-07-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46693      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:18:18   Additional Information  Earth MOID = .767772 au   Jupiter MOID = 2.5436 au   T_jup = 3.513  [ 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 13.6   n/a MPO365262   diameter diameter 4.648 km 0.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 34.07 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Stephens, R.D. (2004) Minor Planet Bull. 31, 4-6.] geometric albedo albedo 0.444   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   1507 Vaasa (1939 RD)          Discovered 1939-Sep-12 by Oterma, L. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1939 RD = 1964 TA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-28 15:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin