+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   176 Iduna (A877 TB) Classification: Main-belt Asteroid          SPK-ID: 2000176 [ 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 50 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1709289306949478 3.1207e-08   a 3.182231016131358 9.765e-09 au q 2.638295671319728 9.9647e-08 au i 22.6697680383897 3.4163e-06 deg node 200.491503704518 9.899e-06 deg peri 188.5553145447109 1.4704e-05 deg M 47.82971019084034 1.0697e-05 deg tp 2458725.019265641030 (2019-Aug-29.51926564) 6.1392e-05 TDB period 2073.461536219411 5.68 9.544e-06 2.613e-08 d yr n .1736227046952586 7.9917e-10 deg/d Q 3.726166360942988 1.1434e-08 au   Orbit Determination Parameters    # obs. used (total)      3196      data-arc span      52259 days (143.08 yr)      first obs. used      1877-10-15      last obs. used      2020-11-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42484      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:51:31   Additional Information  Earth MOID = 1.64416 au   Jupiter MOID = 1.732 au   T_jup = 3.057  [ 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 8.2   n/a MPO421626   diameter diameter 106.976 km 1.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.2877 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Hansen, A.T.; Arentoft, T. (1997) Minor Planet Bull. 24, 14.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Alton, K.B. (2008) Minor Planet Bull. 35, 53.] [Krajewski, R. (2008) Minor Planet Bull. 35, 77.] [Warner, B.D. (2008) Minor Planet Bull. 35, 56-60.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Shevchenko, V.G.; Belksaya, I.N.; Muinon, K.; Penttila, A.; et al. (2016) Plan. Space Sci. 123, 101-116.] [Oey, J.; Williams, H.; Groom, R. (2017) Minor Planet Bull. 44, 200-204.] [Benishek, V. (2018) Minor Planet Bull. 45, 82-91.] [Durech, J.; Hanus, J.; Broz, M.; Lehky, M.; et al. (2017) Icarus 304, 101-109.] [Wang, Y.-B.; Xu, Y.; Fan, C.-B.; Liu, C.-Z. (2018). Astron. Nach. 339, 457-464.] geometric albedo albedo 0.065   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   Tholen spectral type spec_T G   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979) SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 176 Iduna (A877 TB)          Discovered 1877-Oct-14 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A877 TB = 1945 RQ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-16 09:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin