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991 McDonalda

April 12, 2024

991 McDonalda is a Themistian asteroid. It was discovered by Otto Struve in 1922 at the Yerkes Observatory in Williams Bay, Wisconsin, United States. It is named after the McDonald Observatory, which Struve helped found in 1939.[2]

991 McDonalda
Discovery
Discovered byO. Struve
Discovery siteWilliams Bay
Discovery date24 October 1922
Designations
(991) McDonalda
1922 NB, 1949 PF, 1950 WG, 1953 GT1, 1975 EE6
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc80.10 yr (29255 days)
Aphelion3.6381 AU (544.25 Gm)
Perihelion2.6458 AU (395.81 Gm)
3.1419 AU (470.02 Gm)
Eccentricity0.15791
5.57 yr (2034.2 d)
351.48°
0° 10m 37.092s / day
Inclination2.0696°
63.255°
254.682°
Physical characteristics
Mean radius
15.705±1.05 km
0.0638±0.009
C
11.12

References edit

  1. ^ "991 McDonalda (1922 NB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
  2. ^ Lutz D. Schmadel (2011). Dictionary of Minor Planet Names. Addendum to Fifth Edition: 2006–2008. Springer. ISBN 978-3-642-01966-1.

External links edit

  • 991 McDonalda at AstDyS-2, Asteroids—Dynamic Site
    • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
  • 991 McDonalda at the JPL Small-Body Database  
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters


 

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

April 12, 2024
mcdonalda, themistian, asteroid, discovered, otto, struve, 1922, yerkes, observatory, williams, wisconsin, united, states, named, after, mcdonald, observatory, which, struve, helped, found, 1939, discoverydiscovered, struvediscovery, sitewilliams, baydiscovery. 991 McDonalda is a Themistian asteroid It was discovered by Otto Struve in 1922 at the Yerkes Observatory in Williams Bay Wisconsin United States It is named after the McDonald Observatory which Struve helped found in 1939 2 991 McDonaldaDiscoveryDiscovered byO StruveDiscovery siteWilliams BayDiscovery date24 October 1922DesignationsMPC designation 991 McDonaldaAlternative designations1922 NB 1949 PF 1950 WG 1953 GT1 1975 EE6Orbital characteristics 1 Epoch 31 July 2016 JD 2457600 5 Uncertainty parameter 0Observation arc80 10 yr 29255 days Aphelion3 6381 AU 544 25 Gm Perihelion2 6458 AU 395 81 Gm Semi major axis3 1419 AU 470 02 Gm Eccentricity0 15791Orbital period sidereal 5 57 yr 2034 2 d Mean anomaly351 48 Mean motion0 10m 37 092s dayInclination2 0696 Longitude of ascending node63 255 Argument of perihelion254 682 Physical characteristicsMean radius15 705 1 05 kmGeometric albedo0 0638 0 009Spectral typeCAbsolute magnitude H 11 12References edit 991 McDonalda 1922 NB JPL Small Body Database NASA Jet Propulsion Laboratory Retrieved 2 May 2016 Lutz D Schmadel 2011 Dictionary of Minor Planet Names Addendum to Fifth Edition 2006 2008 Springer ISBN 978 3 642 01966 1 External links edit991 McDonalda at AstDyS 2 Asteroids Dynamic Site Ephemeris Observation prediction Orbital info Proper elements Observational info 991 McDonalda at the JPL Small Body Database nbsp Close approach Discovery Ephemeris Orbit diagram Orbital elements Physical parameters nbsp This article about a C type asteroid native to the asteroid belt is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title 991 McDonalda amp oldid 1191608280, wikipedia, wiki, book, books, library,

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