Blog page 121




                                               

Acrux

Acrux, designated α Crucis is a multiple star system 321 light-years from the Sun in the constellation of Crux and part of the asterism known as the Southern Cross. With a combined visual magnitude of +0.76, it is the brightest object in Crux and ...

                                               

BG Crucis

BG Crucis is a suspected binary star system in the southern constellation of Crux. It is visible to the naked eye as a faint yellow-white hued point of light with an apparent visual magnitude that fluctuates around 5.49. The system is located at ...

                                               

BL Crucis

BL Crucis is a red giant and a semiregular variable in the constellation of Crux. It has periods with three frequencies of 30.7, 42.3 and 43.6 days. It is 480 ± 10 light-years distant from Earth.

                                               

BP Crucis

BP Crucis is considered as the optical counterpart to the X-ray source GX 301-2. The system consists of a massive hypergiant star and a neutron star in an eccentric 41.5 day orbit. The distance is likely to be between three and four thousand pars ...

                                               

BU Crucis

BU Cru is one of the brightest members of the NGC 4775 open cluster, better known as the Jewel Box Cluster. It forms the right end of the bar of the prominent letter "A" asterism at the centre of the cluster. The cluster is part of the larger Cen ...

                                               

CD Crucis

CD Crucis, also known as HD 311884, is an eclipsing binary star system in the constellation Crux. It is around 14.000 light years away near the faint open cluster Hogg 15. The binary contains a Wolf–Rayet star and is also known as WR 47.

                                               

CH Crucis

CH Crucis is a solitary variable star in the southern constellation of Crux. It has the Gould designation 35 G. Crucis. The object is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude that fluct ...

                                               

DL Crucis

DL Crucis has a visual apparent magnitude of 6.3 so it is just visible with the unaided eye in dark skies. It lies in the small southern constellation of Crux, halfway between η Crucis and ζ Crucis and close to the constellations brightest star α ...

                                               

Dragonfish Nebula

The Dragonfish Nebula, as it is known for its appearance on infrared images, is a massive emission nebula and star-forming region 30.000 light years from the Sun in the direction of the constellation Crux, the Southern Cross. The Dragonfish Nebul ...

                                               

DS Crucis

DS Crucis is a variable star near the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster. It is in the constellation Crux.

                                               

DU Crucis

DU Crucis is a red supergiant and slow irregular variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.

                                               

Eta Crucis

Eta Crucis is a solitary star in the southern constellation of Crux. It can be seen with the naked eye, having an apparent visual magnitude of 4.14 m. Based upon parallax measurements, η Crucis is located 64 light-years from the Sun. The system m ...

                                               

Gacrux

Gacrux, Gamma Crucis, is the nearest class M giant star to the Sun. With an apparent visual magnitude of +1.63, this is the third-brightest star in the southern constellation of Crux and is listed 26th of the brightest stars in the night sky. A l ...

                                               

Ginan (star)

Ginan, Epsilon Crucis, ε Crucis, is a single, orange-hued star in the southern constellation of Crux. Measurements made by the Hipparcos spacecraft showed an annual parallax shift of 14.19 mas, which provides a distance estimate of about 230 ligh ...

                                               

HD 108147 b

HD 108147 b is a gas giant exoplanet with a minimum mass about half that of Jupiter. It orbits the star in a very tight "torch orbit". The distance between the planet and the star is only a tenth of the distance between Earth and the Sun. A numbe ...

                                               

HD 110432

HD 110432 is a Be star in the south-east of Crux, behind the center of the southern hemispheres dark Coalsack Nebula. It has a stellar classification of B1IVe, which means it is a subgiant star of class B that displays emission lines in its spect ...

                                               

HR 4729

HR 4729 is a multiple star system located about 124 parsecs from the Sun in the constellation of Crux and part of the asterism known as the Southern Cross. It is a close companion of α Crucis and sometimes called α Crucis C.

                                               

HR 4887

HR 4887 is one of the brightest members of the NGC 4775 open cluster, better known as the Jewel Box Cluster. It forms the apex of the prominent letter "A" asterism at the centre of the cluster. The cluster is part of the larger Centaurus OB1 asso ...

                                               

Imai (star)

Imai, Delta Crucis, is a star in the southern constellation of Crux, and is the faintest of the four bright stars that form the prominent asterism known as the Southern Cross. This star has an apparent magnitude of 2.79, and its proper name was a ...

                                               

Iota Crucis

ι Crucis, Latinized as Iota Crucis, is a wide double star in the southern constellation of Crux. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4 m.69. This object is located 125 light-y ...

                                               

IRAS 12063-6259

IRAS 12063-6259 is a compact H II region in the constellation of Crux. It lies at a heliocentric distance of roughly 9.5 kpc and a galactocentric distance of 9.3 kpc. Although previously classified as a planetary nebula as well as an H II region, ...

                                               

João Faras

Mestre João Faras, better known simply as Mestre João, was an astrologer, astronomer, physician and surgeon of King Manuel I of Portugal who accompanied Pedro Alvares Cabral in the discovery of Brazil in 1500, and wrote a famous letter identifyin ...

                                               

Kappa Crucis (star)

Kappa Crucis is a spectroscopic binary star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.

                                               

Lambda Crucis

λ Crucis, Latinized as Lambda Crucis, is a single, variable star in the southern constellation Crux, near the constellation border with Centaurus. It is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual m ...

                                               

Mimosa (star)

Mimosa, designated β Crucis, is the second-brightest object in the constellation of Crux, after Acrux, and the 20th-brightest star in the night sky. It forms part of the prominent asterism called the Southern Cross. Mimosa is a binary star or a p ...

                                               

Mu Crucis

Mu Crucis, Latinized from μ Crucis, is the seventh-brightest star in the constellation Crux commonly known as the Southern Cross. μ Crucis is a wide double star of spectral class B stars, magnitude 4.0 and 5.2 respectively. They lie about 370 lig ...

                                               

NGC 4103

NGC 4103 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 5.000 light years away from Earth, in the Carina-Sagittarius arm.

                                               

NGC 4349

NGC 4349 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 7.000 light years away from Earth.

                                               

NGC 4349-127

NGC 4349-127 is a probable red giant approximately 7.097 light-years away in the constellation of Crux. As a member of the open cluster NGC 4349, it is located about 2000 parsecs from the Sun. Its mass is estimated at 3.9 times Solar, and its age ...

                                               

PSR B1259−63/LS 2883

PSR B1259−63 is a pulsar and member of an eclipsing binary star system with the blue O9.5Ve-class star LS 2883. The pair has an eccentric orbit that is inclined to the line of sight from Earth by about 36°, leading to a 40-day-long eclipse each t ...

                                               

R Crucis

R Crucis is a variable star in the southern constellation of Crux. It has a yellow-white hue and is often too faint to see with the naked eye, having an apparent visual magnitude that fluctuates around 6.89. This object is located at a distance o ...

                                               

S Crucis

S Crucis is a star in the constellation Crux. A Cepheid variable, its apparent magnitude ranges from 6.22 to 6.92 over 4.689 97 d. It is a yellow-white supergiant that pulsates between spectral types F6Ib-II and G1Ib-II. S Crucis is a pulsating v ...

                                               

T Crucis

T Crucis is a star in the constellation Crux. A Cepheid variable, its apparent magnitude ranges from 6.32 to 6.83 over 6.73331 days. It is a yellow-white supergiant that pulsates between spectral types F6Ib and G2Ib. The radius is 49.7 times that ...

                                               

Theta1 Crucis

Theta 1 Crucis is a spectroscopic binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent visual magnitude of 4.30 m. The distance to this star, as determined using parallax measurements, is aroun ...

                                               

Theta2 Crucis

Theta 2 Crucis, Latinized from θ 2 Crucis, is a spectroscopic binary star in the constellation Crux. This pair of stars complete an orbit every 3.4280 days and they have a low orbital eccentricity that is close to 0.0. Theta 2 Crucis is located a ...

                                               

W Crucis

W Crucis is a star system in the constellation Crux. A Beta Lyrae variable, its apparent magnitude ranges from 9.04 to 10.38 over 198 days. Its light curve has been observed to be asymmetric with subsequent maxima differing in height, which is de ...

                                               

WR 46

WR 46 is a Wolf-Rayet star in the constellation of the Southern Cross of apparent magnitude +10.8. It is located at 55 arcmin north of Theta 2 Crucis. The star is a member of the distant stellar association OB4 Cru, and is around 2.900 parsecs or ...

                                               

X Crucis

X Crucis is a classical Cepheid variable star in the southern constellation of Crux. X Crucis is a pulsating variable star with am extremely regular amplitude and period. Its apparent magnitude varies from 8.1 to 8.7 every 6.22 days. This type of ...

                                               

Zeta Crucis

Zeta Crucis, Latinized from ζ Crucis, is a binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent magnitude of 4.06 m. ζ Crucis is located at about 360 light-years from the Sun. It is a member of ...

                                               

2 Cygni

2 Cygni is a blue-white hued star in the northern constellation of Cygnus, located a few degrees from Albireo. It is a probable astrometric binary; the visible component can be viewed with the naked eye, having an apparent visual magnitude of 4.9 ...

                                               

4 Cygni

4 Cygni is a binary star system in the northern constellation of Cygnus. It is a faintly visible to the naked eye with an apparent visual magnitude of 5.17. The distance to 4 Cygni, as determined from its annual parallax shift of 5.8 mas, is abou ...

                                               

8 Cygni

8 Cygni is a single star in the northern constellation of Cygnus. Based upon its parallax of 3.79 mas, it is approximately 860 light-years away from Earth. It is visible to the naked eye as a faint, bluish-white hued star with an apparent visual ...

                                               

15 Cygni

15 Cygni is a single star in the northern constellation Cygnus. With an apparent visual magnitude of 4.90, it is a faint star but visible to the naked eye. The distance to 15 Cygni can be estimated from its annual parallax shift of 11.0 mas, whic ...

                                               

16 Cygni

16 Cygni or 16 Cyg is the Flamsteed designation of a triple star system approximately 69 light-years away from Earth in the constellation of Cygnus. It consists of two Sun-like yellow dwarf stars, 16 Cygni A and 16 Cygni B, together with a red dw ...

                                               

17 Cygni

17 Cygni is the Flamsteed designation for a binary star system in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.00, so, according to the Bortle scale, it is visible from suburban skies at night. Measurements made ...

                                               

20 Cygni

20 Cygni is a single, orange-hued star in the northern constellation of Cygnus. It is a faint star but is visible to the naked eye with an apparent visual magnitude of 5.03. The distance to 20 Cygni can be estimated from its annual parallax shift ...

                                               

22 Cygni

22 Cygni is a binary star system in the northern constellation of Cygnus. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.95. The annual shift of 3.0 mas yields a distance estimate of around ...

                                               

23 Cygni

23 Cygni is a single, blue-white hued star in the northern constellation Cygnus. It is a faint star, visible to the naked eye, with an apparent visual magnitude of 5.14. The distance to this star, as estimated from its annual parallax shift of 5. ...

                                               

26 Cygni

26 Cygni is a single star in the northern constellation of Cygnus. It has the Bayer designation e Cygni, while 26 Cygni is the Flamsteed designation. This star is visible to the naked eye as a faint, yellow-hued point of light with an apparent vi ...

                                               

27 Cygni

27 Cygni is a subgiant star in the northern constellation of Cygnus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38. The distance to this system, as estimated from its annual parallax shift of 41.77 mas, is 78.1 ...