Table of Contents
12 relations: Accretion disk, American Association of Variable Star Observers, Apparent magnitude, Binary star, Chandrasekhar limit, George Alcock, Hercules (constellation), National Geographic Society – Palomar Observatory Sky Survey, Nova, Photographic magnitude, White dwarf, Yaxley, Cambridgeshire.
- 1991 in science
- Astronomical objects discovered in 1991
Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body.
See V838 Herculis and Accretion disk
American Association of Variable Star Observers
The American Association of Variable Star Observers (AAVSO) is an international nonprofit organization.
See V838 Herculis and American Association of Variable Star Observers
Apparent magnitude
Apparent magnitude is a measure of the brightness of a star or other astronomical object.
See V838 Herculis and Apparent magnitude
Binary star
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
See V838 Herculis and Binary star
Chandrasekhar limit
The Chandrasekhar limit is the maximum mass of a stable white dwarf star.
See V838 Herculis and Chandrasekhar limit
George Alcock
George Eric Deacon Alcock, MBE (28 August 1912, in Peterborough, Northamptonshire – 15 December 2000) was an English amateur astronomer.
See V838 Herculis and George Alcock
Hercules (constellation)
Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.
See V838 Herculis and Hercules (constellation)
National Geographic Society – Palomar Observatory Sky Survey
The National Geographic Society – Palomar Observatory Sky Survey (NGS-POSS, or just POSS, also POSS I) was a major astronomical survey, that took almost 2,000 photographic plates of the night sky.
See V838 Herculis and National Geographic Society – Palomar Observatory Sky Survey
Nova
A nova (novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.
Photographic magnitude
Photographic magnitude is a measure of the relative brightness of a star or other astronomical object as imaged on a photographic film emulsion with a camera attached to a telescope.
See V838 Herculis and Photographic magnitude
White dwarf
A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter.
See V838 Herculis and White dwarf
Yaxley, Cambridgeshire
Yaxley is a village and civil parish in the Huntingdonshire district in Cambridgeshire, England.
See V838 Herculis and Yaxley, Cambridgeshire
See also
1991 in science
- Ötzi
- 1991 Kalabahi earthquakes
- 1991 in archaeology
- 1991 in paleontology
- 1991 in science
- December 1991 lunar eclipse
- January 1991 lunar eclipse
- July 1991 lunar eclipse
- June 1991 lunar eclipse
- List of fellows of the Royal Society elected in 1991
- Oh-My-God particle
- Solar eclipse of January 15, 1991
- Solar eclipse of July 11, 1991
- The Thriving Cult of Greed and Power
- V838 Herculis
Astronomical objects discovered in 1991
- (35107) 1991 VH
- (6491) 1991 OA
- (7341) 1991 VK
- (85182) 1991 AQ
- 118P/Shoemaker–Levy
- 125P/Spacewatch
- 12714 Alkimos
- 129P/Shoemaker–Levy
- 13062 Podarkes
- 13070 Seanconnery
- 130P/McNaught–Hughes
- 138P/Shoemaker–Levy
- 13963 Euphrates
- 16525 Shumarinaiko
- 16560 Daitor
- 17473 Freddiemercury
- 17492 Hippasos
- 1991 BA
- 1991 VG
- 21062 Iasky
- 4959 Niinoama
- 5143 Heracles
- 5144 Achates
- 5264 Telephus
- 5335 Damocles
- 5380 Sprigg
- 5381 Sekhmet
- 5786 Talos
- 6070 Rheinland
- 6159 Andréseloy
- 6250 Saekohayashi
- 6398 Timhunter
- 6489 Golevka
- 6522 Aci
- 6726 Suthers
- 6793 Palazzolo
- 7655 Adamries
- 8026 Johnmckay
- 9344 Klopstock
- Clowes–Campusano LQG
- V838 Herculis
References
Also known as V838 Her.