I Zwicky 18 is a galaxy in Ursa Major, 59 million light-years away
I Zwicky 18 (Mrk 116, UGCA 166) is a galaxy in the constellation Ursa Major , 59 million light-years away. It is a telescope object, 6 inches or larger, and it is highest in the evening sky in April.
Galaxy: a system of billions of stars, gas and dust held together by gravity, far outside the Milky Way. Spiral galaxies have a disk with arms; elliptical galaxies are smooth, round or oval swarms of older stars.
Finding I Zwicky 18 from θ UMa
θ UMa
I Zwicky 18
URSA MAJOR
I Zwicky 18 lies 3.6° north of θ UMa , the magnitude 3.2 star. Three fingers held at arm's length cover about 5°.
I Zwicky 18 is highest in the evening in April
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
60°N
JAN at 60°N: 52° high at 9 pm FEB at 60°N: 67° high at 9 pm MAR at 60°N: 80° high at 9 pm APR at 60°N: 81° high at 9 pm MAY at 60°N: 66° high at 9 pm JUN at 60°N: 52° high at 9 pm JUL at 60°N: 40° high at 9 pm AUG at 60°N: 31° high at 9 pm SEP at 60°N: 26° high at 9 pm OCT at 60°N: 26° high at 9 pm NOV at 60°N: 31° high at 9 pm DEC at 60°N: 40° high at 9 pm 50°N
JAN at 50°N: 47° high at 9 pm FEB at 50°N: 64° high at 9 pm MAR at 50°N: 79° high at 9 pm APR at 50°N: 80° high at 9 pm MAY at 50°N: 63° high at 9 pm JUN at 50°N: 46° high at 9 pm JUL at 50°N: 33° high at 9 pm AUG at 50°N: 22° high at 9 pm SEP at 50°N: 16° high at 9 pm OCT at 50°N: 16° high at 9 pm NOV at 50°N: 22° high at 9 pm DEC at 50°N: 32° high at 9 pm 40°N
JAN at 40°N: 40° high at 9 pm FEB at 40°N: 58° high at 9 pm MAR at 40°N: 72° high at 9 pm APR at 40°N: 72° high at 9 pm MAY at 40°N: 57° high at 9 pm JUN at 40°N: 40° high at 9 pm JUL at 40°N: 25° high at 9 pm AUG at 40°N: 13° high at 9 pm SEP at 40°N: 6° high at 9 pm OCT at 40°N: 6° high at 9 pm NOV at 40°N: 13° high at 9 pm DEC at 40°N: 25° high at 9 pm 30°N
JAN at 30°N: 33° high at 9 pm FEB at 30°N: 50° high at 9 pm MAR at 30°N: 62° high at 9 pm APR at 30°N: 63° high at 9 pm MAY at 30°N: 50° high at 9 pm JUN at 30°N: 33° high at 9 pm JUL at 30°N: 17° high at 9 pm AUG at 30°N: 4° high at 9 pm SEP at 30°N: -4° high at 9 pm OCT at 30°N: -4° high at 9 pm NOV at 30°N: 4° high at 9 pm DEC at 30°N: 17° high at 9 pm 20°N
JAN at 20°N: 25° high at 9 pm FEB at 20°N: 42° high at 9 pm MAR at 20°N: 53° high at 9 pm APR at 20°N: 53° high at 9 pm MAY at 20°N: 42° high at 9 pm JUN at 20°N: 25° high at 9 pm JUL at 20°N: 8° high at 9 pm AUG at 20°N: -6° high at 9 pm SEP at 20°N: -14° high at 9 pm OCT at 20°N: -14° high at 9 pm NOV at 20°N: -5° high at 9 pm DEC at 20°N: 8° high at 9 pm 10°N
JAN at 10°N: 17° high at 9 pm FEB at 10°N: 33° high at 9 pm MAR at 10°N: 43° high at 9 pm APR at 10°N: 43° high at 9 pm MAY at 10°N: 33° high at 9 pm JUN at 10°N: 17° high at 9 pm JUL at 10°N: 0° high at 9 pm AUG at 10°N: -15° high at 9 pm SEP at 10°N: -24° high at 9 pm OCT at 10°N: -24° high at 9 pm NOV at 10°N: -14° high at 9 pm DEC at 10°N: -0° high at 9 pm 0°
JAN at 0°: 9° high at 9 pm FEB at 0°: 24° high at 9 pm MAR at 0°: 33° high at 9 pm APR at 0°: 33° high at 9 pm MAY at 0°: 24° high at 9 pm JUN at 0°: 9° high at 9 pm JUL at 0°: -8° high at 9 pm AUG at 0°: -24° high at 9 pm SEP at 0°: -34° high at 9 pm OCT at 0°: -33° high at 9 pm NOV at 0°: -23° high at 9 pm DEC at 0°: -8° high at 9 pm 10°S
JAN at 10°S: 1° high at 9 pm FEB at 10°S: 15° high at 9 pm MAR at 10°S: 23° high at 9 pm APR at 10°S: 24° high at 9 pm MAY at 10°S: 15° high at 9 pm JUN at 10°S: 0° high at 9 pm JUL at 10°S: -16° high at 9 pm AUG at 10°S: -33° high at 9 pm SEP at 10°S: -43° high at 9 pm OCT at 10°S: -43° high at 9 pm NOV at 10°S: -32° high at 9 pm DEC at 10°S: -17° high at 9 pm 20°S
JAN at 20°S: -8° high at 9 pm FEB at 20°S: 6° high at 9 pm MAR at 20°S: 14° high at 9 pm APR at 20°S: 14° high at 9 pm MAY at 20°S: 6° high at 9 pm JUN at 20°S: -8° high at 9 pm JUL at 20°S: -25° high at 9 pm AUG at 20°S: -41° high at 9 pm SEP at 20°S: -53° high at 9 pm OCT at 20°S: -53° high at 9 pm NOV at 20°S: -41° high at 9 pm DEC at 20°S: -25° high at 9 pm 30°S
JAN at 30°S: -16° high at 9 pm FEB at 30°S: -3° high at 9 pm MAR at 30°S: 4° high at 9 pm APR at 30°S: 4° high at 9 pm MAY at 30°S: -3° high at 9 pm JUN at 30°S: -16° high at 9 pm JUL at 30°S: -32° high at 9 pm AUG at 30°S: -49° high at 9 pm SEP at 30°S: -63° high at 9 pm OCT at 30°S: -63° high at 9 pm NOV at 30°S: -49° high at 9 pm DEC at 30°S: -32° high at 9 pm 40°S
JAN at 40°S: -24° high at 9 pm FEB at 40°S: -12° high at 9 pm MAR at 40°S: -6° high at 9 pm APR at 40°S: -6° high at 9 pm MAY at 40°S: -12° high at 9 pm JUN at 40°S: -24° high at 9 pm JUL at 40°S: -40° high at 9 pm AUG at 40°S: -57° high at 9 pm SEP at 40°S: -72° high at 9 pm OCT at 40°S: -72° high at 9 pm NOV at 40°S: -56° high at 9 pm DEC at 40°S: -40° high at 9 pm
below horizon
low
20-40°
40-60°
overhead-ish
The chart gives its height above the horizon at 9 pm through the year, from 60°N to 40°S. It can be seen from the whole northern hemisphere and south to about 35°S, and never sets north of 35°N.
I Zwicky 18 is 59 million light-years away
The light seen from I Zwicky 18 tonight left it about 59 million years ago, long before modern humans existed. It ranks 126 of 422 by distance among the galaxies on Go Astronomy. Distance source: Cepheids, Aloisi 2007.
Objects within 6° of I Zwicky 18
I Zwicky 18 catalog data
Field Value
Designations Mrk 116, UGCA 166 Type galaxy Constellation Ursa Major Right ascension (J2000) 09h 34.0m Declination (J2000) +55° 14′ Distance 59 million light-years (Cepheids, Aloisi 2007) Best month April Best with Telescope
