Table of Contents
41 relations: Angular distance, Apparent magnitude, Astronomy & Astrophysics, Bortle scale, BY Draconis variable, Calcium hydride, Celestial equator, Cetus, Constellation, CSIRO, Debris disk, Double star, Effective temperature, Flamsteed designation, G-type main-sequence star, Gauss (unit), Glossary of astronomy, Hipparcos, Hyades (star cluster), Light curve, Light-year, Minute and second of arc, Photosphere, Proper motion, SIMBAD, Sine and cosine, Solar analog, Spectral line, Star, Starspot, Stellar atmosphere, Stellar classification, Stellar kinematics, Stellar magnetic field, Stellar nucleosynthesis, Stellar parallax, Stellar population, Sun, Titanium oxide, Variable star, Variable-star designation.
Angular distance
Angular distance or angular separation is the measure of the angle between the orientation of two straight lines, rays, or vectors in three-dimensional space, or the central angle subtended by the radii through two points on a sphere.
See 9 Ceti and Angular distance
Apparent magnitude
Apparent magnitude is a measure of the brightness of a star or other astronomical object.
See 9 Ceti and Apparent magnitude
Astronomy & Astrophysics
Astronomy & Astrophysics (A&A) is a monthly peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.
See 9 Ceti and Astronomy & Astrophysics
Bortle scale
The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location.
BY Draconis variable
BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence. 9 Ceti and bY Draconis variable are bY Draconis variables.
See 9 Ceti and BY Draconis variable
Calcium hydride
Calcium hydride is the chemical compound with the formula, an alkaline earth hydride.
See 9 Ceti and Calcium hydride
Celestial equator
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
See 9 Ceti and Celestial equator
Cetus
Cetus is a constellation, sometimes called 'the whale' in English.
See 9 Ceti and Cetus
Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
CSIRO
The Commonwealth Scientific and Industrial Research Organisation (CSIRO) is an Australian Government agency responsible for scientific research.
See 9 Ceti and CSIRO
Debris disk
A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star.
Double star
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes.
Effective temperature
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
See 9 Ceti and Effective temperature
Flamsteed designation
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
See 9 Ceti and Flamsteed designation
G-type main-sequence star
A G-type main-sequence star (spectral type: G-V), also often, and imprecisely, called a yellow dwarf, or G star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.9 to 1.1 solar masses and an effective temperature between about. 9 Ceti and g-type main-sequence star are g-type main-sequence stars.
See 9 Ceti and G-type main-sequence star
Gauss (unit)
The gauss (symbol:, sometimes Gs), is a unit of measurement of magnetic induction, also known as magnetic flux density.
Glossary of astronomy
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields.
See 9 Ceti and Glossary of astronomy
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
Hyades (star cluster)
The Hyades (Greek Ὑάδες, also known as Caldwell 41, Collinder 50, or Melotte 25) is the nearest open cluster and one of the best-studied star clusters.
See 9 Ceti and Hyades (star cluster)
Light curve
In astronomy, a light curve is a graph of the light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y-axis and with time on the x-axis.
Light-year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.
Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol, is a unit of angular measurement equal to of one degree.
See 9 Ceti and Minute and second of arc
Photosphere
The photosphere is a star's outer shell from which light is radiated.
Proper motion
Proper motion is the astrometric measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
SIMBAD
SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data) is an astronomical database of objects beyond the Solar System.
Sine and cosine
In mathematics, sine and cosine are trigonometric functions of an angle.
See 9 Ceti and Sine and cosine
Solar analog
Solar-type stars, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun.
Spectral line
A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum.
Star
A star is a luminous spheroid of plasma held together by self-gravity.
See 9 Ceti and Star
Starspot
Starspots are stellar phenomena, so-named by analogy with sunspots.
Stellar atmosphere
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
See 9 Ceti and Stellar atmosphere
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
See 9 Ceti and Stellar classification
Stellar kinematics
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
See 9 Ceti and Stellar kinematics
Stellar magnetic field
A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star.
See 9 Ceti and Stellar magnetic field
Stellar nucleosynthesis
In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars.
See 9 Ceti and Stellar nucleosynthesis
Stellar parallax
Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars.
See 9 Ceti and Stellar parallax
Stellar population
In 1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations.
See 9 Ceti and Stellar population
Sun
The Sun is the star at the center of the Solar System. 9 Ceti and Sun are g-type main-sequence stars.
See 9 Ceti and Sun
Titanium oxide
Titanium oxide may refer to.
Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time.
Variable-star designation
In astronomy, a variable-star designation is a unique identifier given to variable stars. 9 Ceti and variable-star designation are objects with variable star designations.
See 9 Ceti and Variable-star designation
References
Also known as 9 Cet, BE Cet, BE Ceti.