Population I stars

The Sun is the star located at the centre of the Solar System. It is a massive sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is the main source of energy for life on Earth. The Sun has been an object of veneration in many cultures and a central subject of astronomical research since antiquity.

Sirius is the brightest star in the night sky, located in the southern constellation of Canis Major. Its name is derived from the Greek word (Latin script: ; ). The star is designated  Canis Majoris, Latinized to Alpha Canis Majoris, and abbreviated  CMa or Alpha CMa. With a visual apparent magnitude of −1.46, Sirius is almost twice as bright as Canopus, the next brightest star. Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance betw

triple star system in the constellation Centaurus, where one of the three stars, Proxima Centauri, being the closest star to the Earth

Betelgeuse is a red supergiant star in the equatorial constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second brightest in its constellation. It is a distinctly reddish, semiregular variable star whose apparent magnitude, varying between +0.0 and +1.6, with a main period near 400 days, has the widest range displayed by any first-magnitude star. Betelgeuse is the brightest star in the night sky at near-infrared wavelengths. Its Bayer designation is ', Latinised to Alpha Orionis and abbreviated Alpha Ori or '.

Canopus is the brightest star in the southern constellation of Carina and the second-brightest star in the night sky. It is designated α Carinae, which is romanized (transliterated) to Alpha Carinae. With a visual apparent magnitude of −0.74, it is outshone only by Sirius.

Rigel is a blue supergiant star in the equatorial constellation of Orion. It has the Bayer designation β Orionis, which is Latinized to Beta Orionis and abbreviated Beta Ori or β Ori. Rigel is the brightest and most massive componentand the eponymof a star system of at least four stars that appear as a single blue-white point of light to the naked eye. This system is located at a distance of approximately .

Antares is the brightest star in the constellation of Scorpius. It has the Bayer designation α Scorpii, which is Latinised to Alpha Scorpii. Often referred to as "the heart of the scorpion", Antares is flanked by σ Scorpii and τ Scorpii near the center of the constellation. Distinctly reddish when viewed with the naked eye, Antares is a slow irregular variable star that ranges in brightness from an apparent visual magnitude of +0.6 down to +1.6. It is on average the fifteenth-brightest star in the night sky. Antares is the brightest and most evolved stellar member of the Scorpius–Centaurus ass

Capella is the brightest star in the northern constellation of Auriga. It has the Bayer designation α Aurigae, which is Latinised to Alpha Aurigae and abbreviated Alpha Aur or α Aur. Capella is the sixth-brightest star in the night sky, and the third-brightest in the northern celestial hemisphere after Arcturus and Vega. A prominent object in the northern sky, it is circumpolar to observers north of 44°N. Its name meaning "little goat" in Latin, Capella depicted the goat Amalthea that suckled Zeus in classical mythology. Capella is relatively close, at . It is one of the brightest X-ray source

|- ! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics |- style="vertical-align:top" ! style="text-align:left" | Evolutionary stage | Main sequence |- style="vertical-align:top" ! style="text-align:left" | Spectral type | M8V |- style="vertical-align:top" ! style="text-align:left" | Apparent magnitude (R) | |- style="vertical-align:top" ! style="text-align:left" | Apparent magnitude (I) | |- style="vertical-align:top" ! style="text-align:left" | Apparent magnitude (J) | |- style="vertical-align:top" ! style="text-alig

Procyon () is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with an apparent visual magnitude of 0.34. It has the Bayer designation α Canis Minoris, which is Latinized to Alpha Canis Minoris, and abbreviated α CMi or Alpha CMi, respectively. As determined by the European Space Agency Hipparcos astrometry satellite, this system lies at a distance of just , and is therefore one of Earth's nearest stellar neighbors. A binary star system, Procyon consists of a white-hued main-sequence star of spectral type F5 IV–V, designated co

Regulus is the brightest object in the constellation Leo and one of the brightest stars in the night sky. It has the Bayer designation designated α Leonis, which is Latinized to Alpha Leonis, and abbreviated Alpha Leo or α Leo. Regulus appears single, but is actually a quadruple star system composed of four stars that are organized into two pairs. The system lies approximately 79 light years from the Solar System.

red hypergiant in the constellation Canis Major

red supergiant star in the constellation Scutum

Alioth , also called Epsilon Ursae Majoris, is a star in the northern constellation of Ursa Major. The designation is Latinised from ε Ursae Majoris and abbreviated Epsilon UMa or ε UMa. Despite being designated "ε" (epsilon), it is the brightest star in the constellation and at magnitude 1.77 is the thirty-third brightest star in the sky.

binary star

red dwarf in the constellation Leo

binary star in the constellation Cepheus

binary star system

star in the constellation Pegasus

star in the constellation Taurus

red hypergiant star in the constellation of Cygnus

Denebola is the second-brightest star in the zodiac constellation of Leo. It is the easternmost of the bright stars of Leo. It has the Bayer designation Beta Leonis or β Leonis, which are abbreviated Beta Leo or β Leo. Denebola is an A-type main sequence star with 75% more mass than the Sun and 15 times the Sun's luminosity. Based on parallax measurements from the Hipparcos astrometry satellite, the star is at a distance of from the Sun. Its apparent visual magnitude is 2.14, making it readily visible to the naked eye. Denebola is a Delta Scuti type variable star, meaning its luminosity varies

star in the constellation of Cepheus

star in the northern constellation of Pegasus

one of the most luminous known stars in the Milky Way Galaxy

small star in the equatorial zodiac constellation of Virgo

star in the constellation of Puppis

star

star in the constellation Ara

Variable star in the constellation Andromeda

star in the northern constellation Cygnus

Meissa , designated Lambda Orionis (λ Orionis, abbreviated Lambda Ori, λ Ori) is a star in the constellation of Orion. It is a multiple star approximately away with a combined apparent magnitude of 3.33. The main components are an O9 giant star and a B-class main sequence star, separated by about 4″. Despite Meissa being more luminous and only slightly further away than Rigel, it appears 3 magnitudes dimmer at visual wavelengths, with much of its radiation emitted in the ultraviolet due to its high temperature.

star in the constellation Andromeda

star in the zodiac constellation of Libra

star in the northern constellation of Draco

star in the constellation Canis minor

star in the constellation Lepus

star in the constellation Puppis

Supergiant star possibly within the open cluster Stephenson 2

binary star system in the constellation Aries

star in the constellation Aquarius

star

star in the constellation Cassiopeia

star in the constellation of Cephei

star in the constellation Cygnus

star in the constellation Pictor

star in the constellation Aquarius

Extrasolar PlanetsEncyclopaediadata

star in the constellation Aquarius

star in the constellation Cassiopeia

star in the southern constellation of Lupus

star in the constellation Coma Berenices

star

star in the constellation Ursa Major

star in the constellation Cepheus

binary system in the constellation Lepus

recurring nova in the constellation Corona Borealis

star in the southern constellation of Sculptor

star in the constellation Carina