3C 215

3C 215 is a Seyfert galaxy / Quasar[1][2][3] located in the constellation Cancer.

3C 215
Observation data (Epoch J2000)
ConstellationCancer
Right ascension 09h 06m 31.86s[1]
Declination+16° 46′ 11.9″[1]
Redshift0.411 551[1]
0.412 100[2]
Distance (comoving)1,545 megaparsecs (5,040 Mly) h−1
0.73
[2]
TypeSy1, QSO, X, IR, G, blu[1]
QSO, FR II, Sy 1.5[2]
Apparent magnitude (V)18.27[1]
Other designations
DB 62, LEDA 2817602, 3C 215, 4C 16.26, QSO B0903+16
See also: Quasar, List of quasars

References

  1. ^ a b c d e f "Query : 3C 215". Simbad. Centre de Données astronomiques de Strasbourg. Retrieved 2 June 2015.
  2. ^ a b c d "NED results for object 3C 215". NASA/IPAC Extragalactic Database. Retrieved 2 June 2015.
  3. ^ Alan Bridle (6 November 1996). "3C215 = B0903+169". National Radio Astronomy Observatory (NRAO). Retrieved 2010-04-15.

External links

Coordinates: Sky map 09h 06m 31.86s, +16° 46′ 11.9″

14 Cancri

14 Cancri is a star in the northern zodiac constellation of Cancer. It can be referred to as ψ Cancri, very occasionally as ψ2 Cancri, to distinguish it from 13 Cancri which is sometimes called ψ1 Cancri. It is just barely visible to the naked eye, having an apparent visual magnitude of +5.73. Based upon an annual parallax shift of 24.18 mas as seen from Earth, it is located 135 light years from the Sun. It may be a member of the Wolf 630 moving group of stars.This object has a stellar classification of G7 V, which would suggest it is a G-type main-sequence star. However, Jofré et al. (2015) consider it to be a more evolved subgiant star due to a surface gravity of log g = 3.87. As such, it has an estimated 1.5 times the mass of the Sun and 3.2 times the Sun's radius. The star is 2.4 billion years old with what appears to be a leisurely rotation rate, judging by a projected rotational velocity of 0.98 km/s. It is radiating eight times the Sun's luminosity from its photosphere at an effective temperature of 5,311 K.

82 Cancri

82 Cancri (Pi2 Cancri, π2 Cancri) is a solitary, orange-hued star in the zodiac constellation of Cancer. This is an evolved K-type giant star with a stellar classification of K1 III. With an apparent visual magnitude of +5.33, it is visible to the naked eye on a dark night. Based upon an annual parallax shift of 5.37 mas as seen from Earth, this star is located roughly 610 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.10 magnitudes due to interstellar dust.

Kappa Cancri

Kappa Cancri, Latinized from κ Cancri, is a blue-white hued binary star system in the zodiac constellation of Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.23. The magnitude difference between the two stars is about 2.6. Based upon an annual parallax shift of 7.13 mas as seen from the Earth, the system is located roughly 460 light years from the Sun.

This is a single-lined spectroscopic binary star system with an orbital period of 6.39 days and an eccentricity of 0.13. The primary, component A, has a stellar classification of B8 IIIp, suggesting it is a B-type giant star. It a mercury-manganese star, a type of chemically peculiar star showing large overabundances of those two elements in the outer atmosphere. It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +5.22 to +5.27 with a period of 5 days.The primary component has 4.5 times the mass of the Sun, 5 times the Sun's radius, and an effective temperature of 13,200 K. The secondary, component B, is a smaller star with 2.1 times the mass and 2.4 times the radius of the Sun, having an effective temperature of 8,500 K.

Lambda Cancri

Lambda Cancri (λ Cancri, abbreviated Lambda Cnc, λ Cnc) is a blue-white hued spectroscopic binary star in the zodiac constellation of Cancer. With a combined apparent visual magnitude of +5.93, it is faintly visible to the naked eye. Based upon parallax measurements obtained during the Gaia mission, it is about 550 light-years distant from the Sun.The two components are designated Lambda Cancri A (also named Piautos) and B.

Mu1 Cancri

Mu1 Cancri, Latinized from μ1 Cancri, is a evolved red giant star in the zodiac constellation of Cancer. Parallax measurements made by the Hipparcos spacecraft put it about 740 light years (230 parsecs) from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.28. The name Mu1 comes from the Bayer naming system: the "1" in the name is because (from Earth) it appears to be close to 10 Cancri (Mu2 Cancri). Mu1 Cancri is a variable star and was given the variable star designation BL Cancri. It is a slow irregular variable with periods of 22.6, 37.8, and 203.7 days.

Mu2 Cancri

Mu2 Cancri is a solitary, yellow-hued star in the zodiac constellation of Cancer. It is visible to the naked eye with an apparent visual magnitude of +5.30. Based upon an annual parallax shift of 42.94 mas as seen from Earth, this star is located around 76.0 light years from the Sun. Mu2 Cancri will make its closest approach in about 600,000 years when it passes at a distance of 4.9 pc (16 ly).At the estimated age of 5.6 billion years, it is an evolving G-type subgiant star with a stellar classification of G2 IV. It has 1.2 times the mass of the Sun and 1.8 times the Sun's radius. Mu2 Cancri has relatively high metallicity − what astronomers term the abundance of elements other than hydrogen and helium − having a 29% higher abundance compared to the Sun. It is radiating 3.45 times the Sun's luminosity at an effective temperature of 5,809 K.

Nu Cancri

Nu Cancri, Latinized from ν Cancri, is a binary star in the zodiac constellation of Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.46. Based upon an annual parallax shift of 8.31 mas as seen from the Earth, the star is located roughly 390 light years from the Sun.

This is a single-lined spectroscopic binary system with an orbital period of 3.8 years and an eccentricity of 0.35. The primary, component A, is a white-hued A-type giant star with a stellar classification of A0 III. It is a magnetic Ap star with a field strength of 846×10−4 T, showing abundance peculiarities in strontium, chromium, and mercury. The star has 2.8 times the mass of the Sun and is radiating 93 times the Sun's luminosity from its photosphere at an effective temperature of 10,250 K.

Omega1 Cancri

Omega1 Cancri (ω1 Cancri) is a yellow-hued star in the zodiac constellation of Cancer. It is a faint star near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 5.85. Based upon an annual parallax shift of 4.92 mas as seen from Earth, this system is roughly 660 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.10 due to interstellar dust.At an estimated age of 270 million years, this is an evolved G-type giant with a stellar classification of G8 III. It has 3.4 times the mass of the Sun and is radiating 224 times the solar luminosity from its photosphere at an effective temperature of 5,070. The surface metallicity of this star – what astronomers term the abundance of elements other than hydrogen and helium – is 41% higher than in the Sun.

Phi1 Cancri

Phi1 Cancri, Latinized from φ1 Cancri, is a solitary, orange-hued star in the constellation Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.57. Based upon an annual parallax shift of 8.74 mas, it is approximately 370 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K5 III. The measured angular diameter of this star, after correction for limb darkening, is 1.87±0.02 mas. At the estimated distance of Phi1 Cancri, this yields a physical size of about 17 times the radius of the Sun. It is radiating 121 times the Sun's luminosity from its photosphere at an effective temperature of 4,138 K.

Phi2 Cancri

Phi2 Cancri (φ2 Cancri) is a binary star in the constellation Cancer, about 280 light-years from Earth. Both components are white A-type main sequence dwarfs with apparent magnitudes of +6.3. They are separated by 5.126 arcseconds on the sky, and their mean apparent brightness is +5.55 magnitudes.

Rho2 Cancri

Rho2 Cancri (ρ2 Cancri) is a solitary, yellow-hued star in the constellation Cancer. With an apparent visual magnitude of 5.22, it is visible to the naked eye on a dark night. Based upon an annual parallax shift of 6.70 mas as seen from Earth, this star is located around 490 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.06 due to interstellar dust.At the age of about 234 million years, is an evolved, G-type giant star with a stellar classification of G8 III. It has an estimated 3.6 times the mass of the Sun and has expanded to 24 times the Sun's radius. It is radiating 310 times the Sun's luminosity from its photosphere at an effective temperature of 4,994 K.

Sigma1 Cancri

Sigma1 Cancri, Latinized from σ1 Cancri, is a solitary, white-hued star in the zodiac constellation of Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.68. Based upon an annual parallax shift of 15.51 mas as seen from Earth, this star is located around 210 light years from the Sun.

This is a chemically peculiar A-type main sequence star with a stellar classification of A8 Vas. At an age of about 301 million years, Sigma1 Cancri is around 67% of the way through its main sequence lifespan. The star has 1.7 times the mass of the Sun and is radiating 18 times the Sun's luminosity from its photosphere at an effective temperature of 8,116 K. It has a magnitude 13.3 visual companion at an angular separation of 5.2 arc seconds along a position angle of 276°, as of 2011.

Sigma2 Cancri

Sigma2 Cancri, Latinized from σ2 Cancri, is the Bayer designation for a solitary, white-hued star in the constellation Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.44. Based upon an annual parallax shift of 16.79 mas as seen from Earth, this star is located around 194 light years from the Sun.

With an estimated age of 441 million years, this is an A-type subgiant star with a stellar classification of A7 IV. It is spinning relatively rapidly with a projected rotational velocity of 133 K. The star has an estimated 1.8 times the mass of the Sun and is radiating 21.5 times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,309 K.

Sigma3 Cancri

Sigma3 Cancri (σ3 Cancri) is a solitary, yellow-hued star in the zodiac constellation of Cancer. With an apparent visual magnitude of +5.24, it is a dim star that is visible to the naked eye. Based upon an annual parallax shift of 11.03 mas as seen from Earth, it is located around 296 light years from the Sun. The star's proper motion makes it a candidate for membership in the IC 2391 supercluster.This is an evolved, G-type giant star with a stellar classification of G9 III. At the estimated age of 420 million years it is a red clump star on the horizontal branch, which indicates it is generating energy through helium fusion at its core. Sigma3 Cancri has 2.8 times the mass of the Sun and has expanded to 10.3 times the Sun's radius. It is radiating 72 times the solar luminosity from its photosphere at an effective temperature of 5,170 K.

Tau Cancri

Tau Cancri (τ Cancri) is a solitary, yellow-hued star in the zodiac constellation of Cancer. With an apparent visual magnitude of +5.42, it is faintly visible to the naked eye. Based upon an annual parallax shift of 11.92 mas as seen from Earth, it is located around 274 light years from the Sun.

With an age of about 620 million years and a stellar classification of G8 III, this is a red clump giant star, which indicates that it has evolved onto the horizontal branch and is generating energy through helium fusion at its core. It is a microvariable, showing a luminosity variation of 0.04 in magnitude. Tau Cancri has an estimated 2.4 times the mass of the Sun and 7.8 times the Sun's radius. The star radiates 40 times the solar luminosity from its photosphere at an effective temperature of 5,153 K.

Theta Cancri

Theta Cancri, Latinized from θ Cancri, is a multiple star system in the zodiac constellation of Cancer, 410 light years from Earth. The primary, component A, is classified as an orange K-type giant with an apparent magnitude of +5.32. Since it is near the ecliptic, it can be occulted by the Moon and, very rarely, by planets.

In Chinese astronomy, Ghost (Chinese: 鬼宿; pinyin: Guǐ Xiù) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri. Theta Cancri is the first star of Ghost (Chinese: 鬼宿一; pinyin: Guǐ Xiù yī), as it is also the determinative star for that asterism.

Upsilon1 Cancri

Upsilon1 Cancri, Latinized from υ1 Cancri, is the Bayer designation for a solitary, yellow-white hued star in the constellation Cancer. It is faintly visible with the naked eye, having an apparent visual magnitude of +5.7. Based upon an annual parallax shift of 13.05 mas as seen from Earth, this system is roughly 250 light years from the Sun.

This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s. It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude. The star is about 570 million years old and it has an estimated mass of 1.47 times the mass of the Sun. On average, it is radiating 25 times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.

Upsilon2 Cancri

Upsilon2 Cancri (υ2 Cancri) is a faint, yellow-hued star in the zodiac constellation of Cancer. It is near the lower brightness limit of stars that can be viewed with the naked eye, having an apparent visual magnitude of +6.35. Based upon an annual parallax shift of 5.87 mas as seen from Earth, this system is roughly 560 light years from the Sun.

This is an evolved G-type giant star with a stellar classification of G9 III. It is radiating 98 times the Sun's luminosity from its photosphere at an effective temperature of 4,881 K. Upsilon2 Cancri is a member of the Epsilon Indi Moving Group of stars that share a common motion through space.

Xi Cancri

Xi Cancri (ξ Cancri, abbreviated Xi Cnc, ξ Cnc) is a spectroscopic binary star system in the zodiac constellation of Cancer. It is visible to the naked eye with an apparent visual magnitude of +5.15. Based upon parallax measurements obtained during the Hipparcos mission, it is roughly 370 light-years distant from the Sun.

The two components are designated Xi Cancri A (also named Nahn) and B.

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