1627 Ivar

1627 Ivar
Light-curve-based 3D-model of Ivar
Discovery[1]
Discovered byE. Hertzsprung
Discovery siteJohannesburg Obs.
(Leiden Southern Station)
Discovery date25 September 1929
Designations
(1627) Ivar
Named after
Ivar Hertzsprung
(discoverer's brother)[2]
1929 SH · 1957 NA
1957 XA
NEO · Amor[1][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc87.62 yr (32,002 days)
Aphelion2.6015 AU
Perihelion1.1240 AU
1.8628 AU
Eccentricity0.3966
2.54 yr (929 days)
229.02°
0° 23m 15.72s / day
Inclination8.4513°
133.14°
2023-Sep-09
167.76°
Earth MOID0.1117 AU · 43.5 LD
Physical characteristics
Dimensions≈15×6×6 km[4]
8.370±0.075 km[5]
9.12 km[6]
9.9±2.8 km[7]
10.2 km[8]
4.795 h[9]
4.795±0.002 h[10]
4.795170 h[11]

4.79517±0.00005 h[12]

4.7954±0.006 h[13]
4.796 h[14]
4.7961±0.0001 h[15]
4.797 h[16]
4.798 h[17][18]
4.80 h[19]
0.09±0.12[20]
0.117[8]
0.128±0.123[7]
0.134±0.025[5]
0.15[6][21]
0.151 (taken)[22]
S (Tholen)[1] · S (SMASS)[1]
Srw[23] · S[22][24][25]
B–V = 0.872[1]
U–B = 0.459[1]
12.87±0.1[7] · 12.87[6][22] · 12.90[8] · 12.99±0.25[24] · 13.00[25] · 13.17[9] · 13.2[1][5] · 13.22±0.23[15] · 13.24[16]

1627 Ivar (provisional designation 1929 SH) is an elongated stony asteroid and near-Earth object of the Amor group, approximately 15×6×6 km.[4] It was discovered on 25 September 1929, by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[3] It was named after Ivar Hertzsprung, brother of the discoverer.[2] 1627 Ivar was the first asteroid to be imaged by radar, in July 1985 by the Arecibo Observatory.[26]

  1. ^ a b c d e f g h Cite error: The named reference jpldata was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference springer was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference MPC-Ivar was invoked but never defined (see the help page).
  4. ^ a b Crowell, Jenna L.; Howell, Ellen S.; Magri, Christopher; Nolan, Michael C.; Fernández, Yanga R.; Richardson, James E.; Warner, Brian D.; Marshall, Sean E.; Springmann, Alessondra (July 2017). "Radar and Lightcurve Shape Model of Near-Earth Asteroid (1627) Ivar". Icarus. 291: 254–267. Bibcode:2017Icar..291..254C. doi:10.1016/j.icarus.2016.11.008. ISSN 0019-1035.
  5. ^ a b c Cite error: The named reference WISE was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Delbo-2003 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Mueller-2011a was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Harris-1998a was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Pravec-1996 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Warner-2015n was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Kaasalainen-2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Hanus-2015a was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Skiff-2012a was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Harris-1985 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Warner-2014b was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference Hahn-1989 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Lupishko-1986 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Kiss-1999 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Szabo-2001a was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Thomas-2011b was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference Mainzer-2011 was invoked but never defined (see the help page).
  22. ^ a b c Cite error: The named reference lcdb was invoked but never defined (see the help page).
  23. ^ Cite error: The named reference Thomas-2014 was invoked but never defined (see the help page).
  24. ^ a b Cite error: The named reference Veres-2015 was invoked but never defined (see the help page).
  25. ^ a b Cite error: The named reference Carry-2016 was invoked but never defined (see the help page).
  26. ^ To See the Unseen, A History of Planetary Radar Astronomy - chapter 9, Andrew J. Butrica, The NASA History Series