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The Sun is the brightest star as viewed from Earth, at −26.78 mag. The second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of: the Moon −12.7 mag [1] Venus −4.92 mag; Jupiter −2.94 mag; Mars −2.94 mag; Mercury −2.48 mag; Saturn −0.55 mag [2]
Binary star system 1.14 Pollux: Star 1.16 Fomalhaut: Star Part of a Triple star system with TW Piscis Austrini and Fomalhaut C: 1.25 1.21 Deneb: Star 1.25 1.23 Mimosa: Binary star system 1.40 Regulus: Quadruple star system 1.50 Epsilon Canis Majoris: Binary star system 1.58 Castor: Sextenary star system Brightest sextuple star system 1.62 [12 ...
It was the brightest event known to have impacted this planet from an origin outside the Solar System; if these gamma rays were visible, with an absolute magnitude of approximately −29, it would have been brighter than the Sun [dubious – discuss] (as measured by the Swift spacecraft).
The brightest astronomical objects have negative apparent magnitudes: for example, Venus at −4.2 or Sirius at −1.46. The faintest stars visible with the naked eye on the darkest night have apparent magnitudes of about +6.5, though this varies depending on a person's eyesight and with altitude and atmospheric conditions. [ 2 ]
A nebula that is visible to the human eye from Earth would appear larger, but no brighter, from close by. [6] The Orion Nebula, the brightest nebula in the sky and occupying an area twice the angular diameter of the full Moon, can be viewed with the naked eye but was missed by early astronomers. [7]
The larger distance derives from the assumption of a very bright absolute magnitude for Canopus. [55] Hipparcos established Canopus as being 310 light-years (95 parsecs) from the Solar System; this is based on its 2007 parallax measurement of 10.43 ± 0.53 mas. [2] At 95 parsecs, the interstellar extinction for Canopus is low at 0.26 magnitudes ...
Enormous Lyα nebula (ELAN) Around the quasar UM287 at around z=2.3. Cosmic filament illuminated by the quasar. MAMMOTH-1: 1,441,000 ly (442,000 pc) [7] Enormous Lyα nebula (ELAN) The nebula is associated with the galaxy overdensity BOSS1441, [7] which is a protocluster at z=2.3. The nebula represents the circumgalactic medium. Its emission is ...
Fifth brightest star in the night sky. [71] Altair (α Aquilae) 2.01 × 1.57 [104] Twelfth brightest star in the night sky. Sirius (α Canis Majoris A) 1.713 [105] AD The brightest star in the night sky. Rigil Kentaurus (α Centauri A) 1.2175 [106] AD Third brightest star in the night sky. Sun: 1: The largest object in the Solar System.