M33 X-7

Measured

Distance

2.58 million light-years

Constellation

Triangulum

Position (J2000)

RA 1h 33m 34s, Dec +30.54°

How far, from the Sun

2.58 million light-years. To cross it:

• Light2.58 million years
• Voyager 1's speed45.8 billion years
• Driving at 100 km/h27.8 trillion years

Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.

Facts

• Its black hole mass, first measured at 15.65 times the Sun's from the eclipses (Orosz et al. 2007), was revised to 11.4 in 2022 (Ramachandran et al.).
• When its mass was measured in 2007, it was the only known black hole in an eclipsing binary.

Where this comes from

• Placed at the Triangulum Galaxy's distance as lib/skySpaceCatalog gives it (McConnachie et al. 2005, 809 ± 24 kpc)
• This research has made use of the SIMBAD database, CDS, Strasbourg, France (Wenger et al. 2000, A&AS 143, 9).
• This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier).

Every catalogue Ouranos draws is credited on the credits page.