The phrase
"apparent magnitude" refers to how bright a celestial object appears from Earth. It is a measure of how much light an object emits or reflects. The higher the
apparent magnitude, the dimmer the object appears, while a lower
apparent magnitude means the object appears brighter in the sky.
Full definition
[90] Then it will reach the stationary radial velocity (RVel) of 0.0 km / s and the maximum
apparent magnitude of − 0.86 v (which is comparable to present - day magnitude of Canopus).
Full - sky star catalogues detach the star designation from the star's constellation and aim at enumerating all stars
with apparent magnitude greater than a given cut - off value.
Depending on its and the planet's position on their respective orbits, Alpha Centauri B would vary
in apparent magnitude between − 18.2 (dimmest) and − 21.0 (brightest).
Also, if another similar planet orbited at 0.71 AU from Alpha Centauri B (so that in turn Alpha Centauri B appeared as bright as the Sun seen from the Earth), this hypothetical planet would receive slightly more light from the more luminous Alpha Centauri A, which would shine 4.7 to 7.3 magnitudes dimmer than Alpha Centauri B (or the Sun seen from the Earth), ranging in
apparent magnitude between − 19.4 (dimmest) and − 22.1 (brightest).
Based on the calculated absolute magnitudes, the
visual apparent magnitudes of Alpha Centauri A and B would be − 6.5 and − 5.2, respectively.
Ok, I did a preliminary check on the Extrasolar Planet Encyclopedia; I converted all
stellar apparent magnitudes to absolute magnitudes, those to luminosity (* solar), and calculated the inner and outer boundaries of the HZ, generously assuming an inner edge of 0.9 AU and an outer edge of 1.5 AU for our own solar system.
Omega Nebula — Messier 17 Constellation: Sagittarius Coordinates: 18h 20m 26s (right ascension), -16 ° 10» 36» (declination) Distance: 5,000 to 6,000 light
years Apparent magnitude: 6.0 Apparent dimensions: 11 arcminutes Angular size: 20 ′ x 15 ′ Designations: Omega Nebula, Messier 17, NGC 6618, Swan Nebula, Horseshoe Nebula, Lobster Nebula, Checkmark Nebula, RCW 160, Sharpless 45, Gum 81
You first plot the cluster's main - sequence on a color - magnitude diagram
with apparent magnitudes, not absolute magnitude.
It ranges in brightness from about − 2.0 to 5.5
in apparent magnitude, but is not easily seen; its greatest angular separation from the Sun (greatest elongation) is only 28.3 ° (it can only be seen in twilight).
Astronomers measure the brightness of objects in the sky on a scale of
apparent magnitude — the brighter the object, the greater the negative number; the dimmer, the greater the positive number.
The size of each star is determined by
its apparent magnitude, as viewed from the current location of the spaceship.
The observer would plot the path of a meteor among the stars on a chart and note
its apparent magnitude, the time, and other information.
Mu Lyrae has
apparent magnitude 5.12 and belongs to the spectral class A0IV.
Even during the time of this nearest approach, however,
the apparent magnitude of Alpha Centauri will still not surpass that of Sirius, which will brighten incrementally over the next 60,000 years, and will continue to be the brightest star as seen from Earth for the next 210,000 years.
These visual
apparent magnitudes are much dimmer than the apparent magnitude of the Sun as viewed from the Earth (− 26.7).
Furthermore, Alpha Centauri A's sidereal period of approximately eighty years means that this star would move through the local ecliptic as slowly as Uranus with its eighty - four year period, but as the orbit of Alpha Centauri A is more elliptical,
its apparent magnitude will be far more variable.
The brighter component is an F - type main sequence star with a stellar classification of F5V [3] and
an apparent magnitude of 6.33.
The Bright Star Catalogue, which is a star catalogue listing all stars of
apparent magnitude 6.5 or brighter, or roughly every star visible to the naked eye from Earth, contains 9,096 stars.
The galaxy is located approximately 11.8 million light years from Earth and has
an apparent magnitude of 6.94.
NGC 6352 is a globular cluster with
an apparent magnitude of 7.8.
The galaxies lie at an approximate distance of 52 million light years from Earth and have
an apparent magnitude of 10.
The cluster Globular One (G1) contains several million stars and has
an apparent magnitude of 13.72, which makes it brighter than the Milky Way's brightest globular, Omega Centauri.
The brightest star in the constellation is Kornephoros, Beta Herculis, with
an apparent magnitude of 2.81.
It has
an apparent magnitude of 5.41 and is approximately 558 light years distant from the solar system.
The cluster is nine light years in radius, has
an apparent magnitude of 7.5, and is approximately 4,900 light years distant.
Cartwheel Galaxy Type: S pec (Ring) Constellation: Sculptor Coordinates: 00h 37m 41.1 s (right ascension), -33 ° 42» 59» (declination) Distance: 496 million light years (150 Mpc) Apparent dimensions: 1 ′.1 x 0 ′.9
Apparent magnitude: 15.2 Mass: 2.9 — 4.8 billion solar masses Designations: Cartwheel Galaxy, PGC 2248, ESO 350 - 40, AM0035 - 335, MCG -06-02-022a
It has
an apparent magnitude that varies from 6.5 to 14.0 over a pulsational period of 732 days.
It has
an apparent magnitude of 5.88 and is 36.1 light years distant from the solar system.
It has
an apparent magnitude of 12.68 and is approximately 60 million light years distant from Earth.
The galaxy lies at an approximate distance of 60 million light years from Earth and has
an apparent magnitude of 10.
It has
an apparent magnitude of 7.6 and is 25,800 light years distant from Earth and about 3,800 light years away from the Galactic centre.
The brightest star in the constellation is Eta Piscium, with
an apparent magnitude of 3.62.
With
an apparent magnitude of 2.84, it is the brightest star in the Ara constellation.
Messier 31 has
an apparent magnitude of 3.44.
Messier 69 lies at a distance of 29,700 light years from Earth and has
an apparent magnitude of 8.31.
The Whirlpool Galaxy has
an apparent magnitude of 8.4 and lies at an approximate distance of 23 million light years from Earth.
The brighter component has
an apparent magnitude of +5.57 and is classified as a blue - white B - type main sequence dwarf.
The galaxy has
an apparent magnitude of 9.8 and lies at an approximate distance of 55 million light years from Earth.
The system is composed of a blue - white giant with the stellar classification of B9III - IV and a visual magnitude of 5.33, a white subgiant belonging to the stellar class A0IVMn with
an apparent magnitude of 5.63, and a star with a magnitude of 8.5 separated from the second component by 37.7 arc seconds.
M54 has
an apparent magnitude of 8.37 and lies at a distance of 87,400 light years from Earth.
AG Antliae has
an apparent magnitude of 5.53 and is more than 2000 light years distant.
In this activity, students learn how to construct a histogram for the stars in a star field, bin them according to
their apparent magnitude and answer questions related to the chart.
This is about 13 billion times brighter than the next brightest star, Sirius, which has
an apparent magnitude of − 1.46.
Easily the brightest object we can see, with
an apparent magnitude of − 26.74.