1990 Pilcher

1990 Pilcher
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date9 March 1956
Designations
(1990) Pilcher
Named after
Frederick Pilcher[1]
(American photometrist)
1956 EE · 1937 JL
1940 FA · 1959 CE1
1964 VS2 · 1972 EC
1972 GO · 1973 QM
main-belt[1][2] · (inner)
background[3][4] · Flora[5][6]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc80.17 yr (29,283 d)
Aphelion2.2851 AU
Perihelion2.0625 AU
2.1738 AU
Eccentricity0.0512
3.21 yr (1,171 d)
92.884°
0° 18m 27s / day
Inclination3.1320°
193.63°
11.957°
Physical characteristics
6.39 km (calculated)[5]
6.754±0.167 km[7]
7.273±0.064 km[8]
2.842±0.001 h[9]
0.1864±0.0254[8]
0.215±0.039[7]
0.24 (assumed)[5]
Tholen = S[2]
S (assumed)[5]
B–V = 0.850[2]
U–B = 0.504[2]
13.14[2][5][8]

1990 Pilcher, provisional designation 1956 EE, is a stony background asteroid from the Florian region of the inner asteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 9 March 1956, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany. In 1982, it was named by the MPC for American physicist and photometrist Frederick Pilcher.[1] The S-type asteroid has a short rotation period of 2.8 hours.[5]

  1. ^ a b c d Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference AstDys-object was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Ferret-Nesvorny-family was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference lcdb was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Ferret was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Masiero-2014 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference WISE was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Brincat-2017a was invoked but never defined (see the help page).