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HIP 99310 The Sun (smaller than a dot at this scale)
Surface temperature
2,400 K
Radius
99 × the Sun
Luminosity
290 × the Sun
Spectral type
R3v
Diagram, not a photograph. Colour from the star’s measured colour index; size from its luminosity and temperature, drawn to one scale with the Sun. Source: HYG stellar database.

Cataloged star · Database record + computed analysis

HIP 99310

HIP 99310 · HD 191738

A real star from the HYG catalog in the constellation Cygnus.

3,197.6 light-years away Apparent magnitude 8.65

Temperature from its color

No spectral type is recorded, but its measured color implies a surface around 2,398 K (2,125 °C), computed from the color index.

How far away is it?

It lies about 3,198 light-years away (980.4 parsecs, from its measured parallax). The light reaching Earth tonight left it around the year -1,171.

How powerful is it?

Its computed luminosity is about 290.3 times the Sun's output (derived from its brightness and distance).

Can you see it?

At apparent magnitude 8.65, it is invisible to the naked eye, though binoculars will show it. It favors northern observers.

It varies

This is a catalogued variable star (SV): its brightness measurably changes over time, whether by pulsation, eclipses in a double system, or surface activity.

Everything above is computed from the catalog’s measured values for this star. Where a value is missing, the statement is omitted rather than guessed.

About this record

Data: the HYG stellar database v4.1 (Hipparcos + Yale + Gliese, CC BY-SA, © David Nash / astronexus). Want the full stories? Our deep star guides cover Sirius, Betelgeuse, Proxima Centauri, Vega and three dozen more. You can also browse the catalog or learn how stars live and die.