Global Information1627 Ivar information
 Light-curve-based 3D-model of Ivar | |
| Discovery[1] | |
|---|---|
| Discovered by | E. Hertzsprung |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 25 September 1929 |
| Designations | |
MPC designation | (1627) Ivar |
Named after | Ivar Hertzsprung (discoverer's brother)[2] |
Alternative designations | 1929 SH · 1957 NA 1957 XA |
Minor planet category | NEO · Amor[1][3] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.62 yr (32,002 days) |
| Aphelion | 2.6015 AU |
| Perihelion | 1.1240 AU |
Semi-major axis | 1.8628 AU |
| Eccentricity | 0.3966 |
Orbital period (sidereal) | 2.54 yr (929 days) |
Mean anomaly | 229.02° |
Mean motion | 0° 23m 15.72s / day |
| Inclination | 8.4513° |
Longitude of ascending node | 133.14° |
Time of perihelion | 2023-Sep-09 |
Argument of perihelion | 167.76° |
| Earth MOID | 0.1117 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] |
Synodic rotation period | 4.795 h[9] 4.795±0.002 h[10] 4.795170 h[11] 4.79517±0.00005 h[12] 4.796 h[14] 4.7961±0.0001 h[15] 4.797 h[16] 4.798 h[17][18] 4.80 h[19] |
Geometric albedo | 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] |
Spectral type | S (Tholen)[1] · S (SMASS)[1] Srw[23] · S[22][24][25] B–V = 0.872[1] U–B = 0.459[1] |
Absolute magnitude (H) | 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]
- ^ a b c d e f g h Cite error: The named reference
jpldatawas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
springerwas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
MPC-Ivarwas invoked but never defined (see the help page). - ^ 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.
- ^ a b c Cite error: The named reference
WISEwas invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Delbo-2003was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Mueller-2011awas invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Harris-1998awas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Pravec-1996was invoked but never defined (see the help page). - ^ Cite error: The named reference
Warner-2015nwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Kaasalainen-2004was invoked but never defined (see the help page). - ^ Cite error: The named reference
Hanus-2015awas invoked but never defined (see the help page). - ^ Cite error: The named reference
Skiff-2012awas invoked but never defined (see the help page). - ^ Cite error: The named reference
Harris-1985was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Warner-2014bwas invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Hahn-1989was invoked but never defined (see the help page). - ^ Cite error: The named reference
Lupishko-1986was invoked but never defined (see the help page). - ^ Cite error: The named reference
Kiss-1999was invoked but never defined (see the help page). - ^ Cite error: The named reference
Szabo-2001awas invoked but never defined (see the help page). - ^ Cite error: The named reference
Thomas-2011bwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Mainzer-2011was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
lcdbwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Thomas-2014was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Veres-2015was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Carry-2016was invoked but never defined (see the help page). - ^ To See the Unseen, A History of Planetary Radar Astronomy - chapter 9, Andrew J. Butrica, The NASA History Series