1627 Ivar

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1627 Ivar
270px
Light-curve-based 3D-model of 1627 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]
1929 SH · 1957 NA
1957 XA
Amor, NEO
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 85.71 yr (31,305 days)   
Aphelion 2.6018 AU
Perihelion 1.1244 AU
1.8631 AU
Eccentricity 0.3964
2.54 yr (929 days)
278.88°
Inclination 8.4511°
133.14°
167.77°
Earth MOID 0.1122 AU
Physical characteristics
Dimensions 9.12 km[3]
10.2 km[4]
9.9±2.8 km[5]
8.370±0.075 km[6]
4.795 h[7][8]
4.796 h[9]
4.798 h[10]
4.797 h[11]
4.798 h[12]
4.80 h[13]
4.795170 h[14]
4.7954±0.006 h[15]
4.7961±0.0001 h[16]
4.79517±0.00005 h[17]
0.15[3][18]
0.117[4]
0.128±0.123[5]
0.09±0.12[19]
0.134±0.025[6]
0.151 (taken)[20]
B–V = 0.872
U–B = 0.459
S (Tholen), S (SMASS)
S [20]
13.2

1627 Ivar, provisional designation 1929 SH, is a large, stony and eccentric asteroid classified as near-Earth object and Amor asteroid, that measures about 9 kilometers in diameter. It was discovered on 25 September 1929 by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[21]

The S-type asteroid orbits the Sun at a distance of 1.1–2.6 AU once every 2.54 years (929 days). Its orbit shows a high eccentricity of 0.40 and is tilted by 8 degrees to the plane of the ecliptic. It has a rotation period of 4.80 hours and an albedo around 0.15.[3][18] In 1985, the body was observed with radar from the Arecibo Observatory in Puerto Rico at a distance of 0.20 AU. The measured radar cross-section was 7.5 square kilometers.[22]

Although, as an Amor asteroid, it is a Mars-crosser, that does not cross the orbit of Earth, it has a low Earth minimum orbit intersection distance (MOID) of 0.1122 AU. In 2074, it will pass Earth at 0.141 AU, closer than it actually approached Mars in 1975 (0.150 AU).

The minor planet was named by the discoverer in honor of his late brother Ivar Hertzsprung.[2]

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found. PDF: http://astro.elte.hu/phd2000/szabogy.pdf
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ 18.0 18.1 Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ 20.0 20.1 Lua error in package.lua at line 80: module 'strict' not found.
  21. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  22. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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