<P> The following is a table giving apparent magnitudes for celestial objects and artificial satellites ranging from the Sun to the faintest object visible with the Hubble Space Telescope (HST): </P> <Table> <Tr> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> <Th> </Th> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> <Th> </Th> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> </Tr> <Tr> <Td> − 27 </Td> <Td> 7010630999999999999 ♠ 6.31 × 10 </Td> <Td> Sun </Td> <Td> − 7 </Td> <Td> 631 </Td> <Td> SN 1006 supernova </Td> <Td> 13 </Td> <Td> 6994631000000000000 ♠ 6.31 × 10 </Td> <Td> 3C 273 quasar limit of 4.5--6 in (11--15 cm) telescopes </Td> </Tr> <Tr> <Td> − 26 </Td> <Td> 7010250999999999999 ♠ 2.51 × 10 </Td> <Td> </Td> <Td> − 6 </Td> <Td> 251 </Td> <Td> ISS (max .) </Td> <Td> 14 </Td> <Td> 6994250999999999999 ♠ 2.51 × 10 </Td> <Td> Pluto (max .) limit of 8--10 in (20--25 cm) telescopes </Td> </Tr> <Tr> <Td> − 25 </Td> <Td> 7010100000000000000 ♠ 1 × 10 </Td> <Td> </Td> <Td> − 5 </Td> <Td> 100 </Td> <Td> Venus (max .) </Td> <Td> 15 </Td> <Td> 6994100000000000000 ♠ 1 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 24 </Td> <Td> 7009398000000000000 ♠ 3.98 × 10 </Td> <Td> </Td> <Td> − 4 </Td> <Td> 39.8 </Td> <Td> Faintest objects visible during the day with the naked eye when the sun is high </Td> <Td> 16 </Td> <Td> 6993398000000000000 ♠ 3.98 × 10 </Td> <Td> Charon (max .) </Td> </Tr> <Tr> <Td> − 23 </Td> <Td> 7009158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> <Td> − 3 </Td> <Td> 15.8 </Td> <Td> Jupiter (max .), Mars (max .) </Td> <Td> 17 </Td> <Td> 6993158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 22 </Td> <Td> 7008631000000000000 ♠ 6.31 × 10 </Td> <Td> </Td> <Td> − 2 </Td> <Td> 6.31 </Td> <Td> Mercury (max .) </Td> <Td> 18 </Td> <Td> 6992631000000000000 ♠ 6.31 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 21 </Td> <Td> 7008250999999999999 ♠ 2.51 × 10 </Td> <Td> </Td> <Td> − 1 </Td> <Td> 2.51 </Td> <Td> Sirius </Td> <Td> 19 </Td> <Td> 6992251000000000000 ♠ 2.51 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 20 </Td> <Td> 7008100000000000000 ♠ 1 × 10 </Td> <Td> </Td> <Td> 0 </Td> <Td> </Td> <Td> Vega, Saturn (max .) </Td> <Td> 20 </Td> <Td> 6992100000000000000 ♠ 1 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 19 </Td> <Td> 7007398000000000000 ♠ 3.98 × 10 </Td> <Td> </Td> <Td> </Td> <Td> 0.398 </Td> <Td> Antares </Td> <Td> 21 </Td> <Td> 6991397999999999999 ♠ 3.98 × 10 </Td> <Td> Callirrhoe (satellite of Jupiter) </Td> </Tr> <Tr> <Td> − 18 </Td> <Td> 7007158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> <Td> </Td> <Td> 0.158 </Td> <Td> Polaris </Td> <Td> 22 </Td> <Td> 6991158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 17 </Td> <Td> 7006631000000000000 ♠ 6.31 × 10 </Td> <Td> </Td> <Td> </Td> <Td> 0.0631 </Td> <Td> Cor Caroli </Td> <Td> 23 </Td> <Td> 6990631000000000000 ♠ 6.31 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 16 </Td> <Td> 7006251000000000000 ♠ 2.51 × 10 </Td> <Td> </Td> <Td> </Td> <Td> 0.0251 </Td> <Td> Acubens </Td> <Td> 24 </Td> <Td> 6990251000000000000 ♠ 2.51 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 15 </Td> <Td> 7006100000000000000 ♠ 1 × 10 </Td> <Td> </Td> <Td> 5 </Td> <Td> 0.01 </Td> <Td> Vesta (max .), Uranus (max .) </Td> <Td> 25 </Td> <Td> 6990100000000000000 ♠ 1 × 10 </Td> <Td> Fenrir (satellite of Saturn) </Td> </Tr> <Tr> <Td> − 14 </Td> <Td> 7005398000000000000 ♠ 3.98 × 10 </Td> <Td> </Td> <Td> 6 </Td> <Td> 6997398000000000000 ♠ 3.98 × 10 </Td> <Td> typical limit of naked eye </Td> <Td> 26 </Td> <Td> 6989398000000000000 ♠ 3.98 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 13 </Td> <Td> 7005158000000000000 ♠ 1.58 × 10 </Td> <Td> full moon </Td> <Td> 7 </Td> <Td> 6997158000000000000 ♠ 1.58 × 10 </Td> <Td> Ceres (max .) </Td> <Td> 27 </Td> <Td> 6989158000000000000 ♠ 1.58 × 10 </Td> <Td> visible light limit of 8m telescopes </Td> </Tr> <Tr> <Td> − 12 </Td> <Td> 7004630999999999999 ♠ 6.31 × 10 </Td> <Td> </Td> <Td> 8 </Td> <Td> 6996631000000000000 ♠ 6.31 × 10 </Td> <Td> Neptune (max .) </Td> <Td> 28 </Td> <Td> 6988631000000000000 ♠ 6.31 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 11 </Td> <Td> 7004250999999999999 ♠ 2.51 × 10 </Td> <Td> </Td> <Td> 9 </Td> <Td> 6996250999999999999 ♠ 2.51 × 10 </Td> <Td> </Td> <Td> 29 </Td> <Td> 6988250999999999999 ♠ 2.51 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 10 </Td> <Td> 7004100000000000000 ♠ 1 × 10 </Td> <Td> </Td> <Td> 10 </Td> <Td> 6996100000000000000 ♠ 1 × 10 </Td> <Td> typical limit of 7 × 50 binoculars </Td> <Td> 30 </Td> <Td> 6988100000000000000 ♠ 1 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 9 </Td> <Td> 7003398000000000000 ♠ 3.98 × 10 </Td> <Td> Iridium flare (max .) </Td> <Td> 11 </Td> <Td> 6995398000000000000 ♠ 3.98 × 10 </Td> <Td> Proxima Centauri </Td> <Td> 31 </Td> <Td> 6987398000000000000 ♠ 3.98 × 10 </Td> <Td> </Td> </Tr> <Tr> <Td> − 8 </Td> <Td> 7003158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> <Td> 12 </Td> <Td> 6995158000000000000 ♠ 1.58 × 10 </Td> <Td> </Td> <Td> 32 </Td> <Td> 6987158000000000000 ♠ 1.58 × 10 </Td> <Td> visible light limit of HST </Td> </Tr> </Table> <Tr> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> <Th> </Th> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> <Th> </Th> <Th> Apparent magnitude </Th> <Th> Brightness relative to magnitude 0 </Th> <Th> Example </Th> </Tr> <Tr> <Td> − 27 </Td> <Td> 7010630999999999999 ♠ 6.31 × 10 </Td> <Td> Sun </Td> <Td> − 7 </Td> <Td> 631 </Td> <Td> SN 1006 supernova </Td> <Td> 13 </Td> <Td> 6994631000000000000 ♠ 6.31 × 10 </Td> <Td> 3C 273 quasar limit of 4.5--6 in (11--15 cm) telescopes </Td> </Tr>

What's the magnitude of a star that's 10 times brighter