V404 Cygni is a microquasar and a binary system in the constellation of Cygnus. It contains a black hole with a mass of about 9 M☉ and an early K giant...

Albireo /ælˈbɪrioʊ/ is a double star designated Beta Cygni (β Cygni, abbreviated Beta Cyg, β Cyg). The International Astronomical Union uses the name "Albireo"...

consisting of Deneb, Gamma Cygni, Delta Cygni, 30 Cygni, Nu Cygni, Tau Cygni, Upsilon Cygni, Zeta Cygni and Epsilon Cygni. Consequently, the Chinese name...

consisting of Epsilon Cygni, Gamma Cygni, Delta Cygni, 30 Cygni, Alpha Cygni, Nu Cygni, Tau Cygni, Upsilon Cygni and Zeta Cygni. Consequently, the Chinese...

V1974 Cygni or Nova Cygni 1992 was a nova, visible to the naked eye, in the constellation Cygnus. It was discovered visually with 10×50 binoculars on...

61 Cygni /ˈsɪɡni/ is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of...

pulsars have much more massive companions. Another black hole in Cygnus is V404 Cygni, which consists of a K-type star orbiting around a black hole of around...

consisting of Gamma Cygni, Delta Cygni, 30 Cygni, Alpha Cygni, Nu Cygni, Tau Cygni, Upsilon Cygni, Zeta Cygni and Epsilon Cygni. Consequently, the Chinese...

widely accepted to be a black hole. HDE 226868 O 30±10 7800±460 2.39±0.14 V404 Cygni Binary star system with orbit t=6.5 d 20h 24m 03.83s +33° 52′ 02.2″ 1989...

NML Cygni or V1489 Cygni (abbreviated to NML Cyg or V1489 Cyg) is a red hypergiant or red supergiant (RSG) in the constellation Cygnus. It is possibly...

such a change was observed in 2019 with the black hole X-ray binary in V404 Cygni. Pulsars emit rapidly repeating radio pulses with extremely high regularity...

rapidly changing jet orientation in the stellar-mass black-hole system V404 Cygni" (PDF). Nature. 569 (7756): 374–377. arXiv:1906.05400. Bibcode:2019Natur...

P Cygni (34 Cygni) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova...

companion star during this period. One of the best such candidates is V404 Cygni. The X-ray emissions from accretion disks sometimes flicker at certain...

orientation of the accretion disc and jets 1989 — Identification of microquasar V404 Cygni as a binary black hole candidate system 1994 — Charles Townes and colleagues...

ξ Cygni (Latinised as Xi Cygni) is a spectroscopic binary star in the constellation Cygnus, made up of a K-type supergiant star (primary) and an A-type...

31 Cygni, also known as ο1 Cygni, Omicron1 Cygni, ο2 Cygni or V695 Cygni, is a ternary star system about 750 light years away in the constellation Cygnus...

V1334 Cygni, also referred to as ADS 14859 and HR 8157 in astronomical literature, is a star about 2350±25 light years from the Earth in the constellation...

V1500 Cygni or Nova Cygni 1975 was a bright nova occurring in 1975 in the constellation Cygnus. It had the second highest intrinsic brightness of any...

J1655-40 GX339-4 KS1731-260 LS I +61 303 LS 5039 Scorpius X-1 SS 433 V404 Cygni V4641 Sgr V691 CrA XMMU J004243.6+412519 XTE J1118+480 XTE J1550-564 List...

V389 Cygni, also known as HD 201433 and HR 8094, is a star about 390 light years from the Earth, in the constellation Cygnus. It is a 5th-magnitude star...

Chi Cygni (Latinised from χ Cygni) is a Mira variable star in the constellation Cygnus, and also an S-type star. It is around 500 light years away. χ...

an exotic state of matter where most light does not escape the star. V404 Cygni Quark star Star composed of quark matter or strange matter. 3C 58, PSR...

V1794 Cygni is a single variable star in the northern constellation Cygnus. It has the identifier HD 199178 from the Henry Draper Catalogue; V1794 Cygni is...

Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse emission nebula surrounding Sadr (γ Cygni) at the center of Cygnus's cross. The Sadr...

Pi1 Cygni (π1 Cygni, abbreviated Pi1 Cyg, π1 Cyg) is a binary star in the northern constellation of Cygnus. It is visible to the naked eye, having a combined...

Zeta Cygni (ζ Cyg) is a binary star system in the northern constellation of Cygnus, the swan. It has an apparent visual magnitude of 3.26 and, based upon...

Tau Cygni, Latinised from τ Cygni, is a binary star system in the constellation Cygnus, approximately 69 light years away from Earth. This visual binary...

SS Cygni is a variable star in the northern constellation Cygnus (the Swan). It was discovered in 1896 by Louisa D. Wells, a computer working under Edward...

Delta Cygni (δ Cygni, abbreviated Delta Cyg, δ Cyg) is a binary star of a combined third-magnitude in the constellation of Cygnus. It is also part of the...