LBN 240 is an emission nebula in Cygnus, 3,270 light-years away
LBN 240 is an emission nebula in the constellation Cygnus , 3,270 light-years away. Lynds rated it brightness class 4 of 6, moderately faint, and color class 3, reddish. It spans 2° × 1° of sky, about 114 light-years across. It is a faint target for long-exposure photography, and it is highest in the evening sky in September.
Emission nebula: a cloud of gas, mostly hydrogen, made to glow by the ultraviolet light of hot young stars. It shines in the red light of hydrogen-alpha, and a nebula filter helps it stand out from the sky.
Finding LBN 240 from Sadr
Sadr
LBN 240
CYGNUS
LBN 240 lies 37′ northwest of Sadr , the magnitude 2.2 star. That is within one binocular field.
LBN 240 is highest in the evening in September
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60°N
JAN at 60°N: 20° high at 9 pm FEB at 60°N: 13° high at 9 pm MAR at 60°N: 11° high at 9 pm APR at 60°N: 14° high at 9 pm MAY at 60°N: 23° high at 9 pm JUN at 60°N: 36° high at 9 pm JUL at 60°N: 50° high at 9 pm AUG at 60°N: 65° high at 9 pm SEP at 60°N: 70° high at 9 pm OCT at 60°N: 62° high at 9 pm NOV at 60°N: 47° high at 9 pm DEC at 60°N: 33° high at 9 pm 50°N
JAN at 50°N: 13° high at 9 pm FEB at 50°N: 3° high at 9 pm MAR at 50°N: 1° high at 9 pm APR at 50°N: 5° high at 9 pm MAY at 50°N: 16° high at 9 pm JUN at 50°N: 32° high at 9 pm JUL at 50°N: 50° high at 9 pm AUG at 50°N: 69° high at 9 pm SEP at 50°N: 80° high at 9 pm OCT at 50°N: 65° high at 9 pm NOV at 50°N: 45° high at 9 pm DEC at 50°N: 28° high at 9 pm 40°N
JAN at 40°N: 5° high at 9 pm FEB at 40°N: -6° high at 9 pm MAR at 40°N: -9° high at 9 pm APR at 40°N: -4° high at 9 pm MAY at 40°N: 9° high at 9 pm JUN at 40°N: 27° high at 9 pm JUL at 40°N: 47° high at 9 pm AUG at 40°N: 70° high at 9 pm SEP at 40°N: 87° high at 9 pm OCT at 40°N: 64° high at 9 pm NOV at 40°N: 42° high at 9 pm DEC at 40°N: 22° high at 9 pm 30°N
JAN at 30°N: -3° high at 9 pm FEB at 30°N: -16° high at 9 pm MAR at 30°N: -19° high at 9 pm APR at 30°N: -13° high at 9 pm MAY at 30°N: 2° high at 9 pm JUN at 30°N: 21° high at 9 pm JUL at 30°N: 43° high at 9 pm AUG at 30°N: 66° high at 9 pm SEP at 30°N: 79° high at 9 pm OCT at 30°N: 61° high at 9 pm NOV at 30°N: 38° high at 9 pm DEC at 30°N: 16° high at 9 pm 20°N
JAN at 20°N: -11° high at 9 pm FEB at 20°N: -25° high at 9 pm MAR at 20°N: -29° high at 9 pm APR at 20°N: -22° high at 9 pm MAY at 20°N: -6° high at 9 pm JUN at 20°N: 15° high at 9 pm JUL at 20°N: 38° high at 9 pm AUG at 20°N: 59° high at 9 pm SEP at 20°N: 69° high at 9 pm OCT at 20°N: 55° high at 9 pm NOV at 20°N: 32° high at 9 pm DEC at 20°N: 10° high at 9 pm 10°N
JAN at 10°N: -18° high at 9 pm FEB at 10°N: -34° high at 9 pm MAR at 10°N: -39° high at 9 pm APR at 10°N: -31° high at 9 pm MAY at 10°N: -13° high at 9 pm JUN at 10°N: 9° high at 9 pm JUL at 10°N: 31° high at 9 pm AUG at 10°N: 51° high at 9 pm SEP at 10°N: 59° high at 9 pm OCT at 10°N: 47° high at 9 pm NOV at 10°N: 26° high at 9 pm DEC at 10°N: 4° high at 9 pm 0°
JAN at 0°: -26° high at 9 pm FEB at 0°: -44° high at 9 pm MAR at 0°: -49° high at 9 pm APR at 0°: -39° high at 9 pm MAY at 0°: -20° high at 9 pm JUN at 0°: 3° high at 9 pm JUL at 0°: 24° high at 9 pm AUG at 0°: 43° high at 9 pm SEP at 0°: 49° high at 9 pm OCT at 0°: 39° high at 9 pm NOV at 0°: 19° high at 9 pm DEC at 0°: -3° high at 9 pm 10°S
JAN at 10°S: -33° high at 9 pm FEB at 10°S: -52° high at 9 pm MAR at 10°S: -59° high at 9 pm APR at 10°S: -47° high at 9 pm MAY at 10°S: -27° high at 9 pm JUN at 10°S: -4° high at 9 pm JUL at 10°S: 17° high at 9 pm AUG at 10°S: 34° high at 9 pm SEP at 10°S: 39° high at 9 pm OCT at 10°S: 31° high at 9 pm NOV at 10°S: 12° high at 9 pm DEC at 10°S: -9° high at 9 pm 20°S
JAN at 20°S: -39° high at 9 pm FEB at 20°S: -60° high at 9 pm MAR at 20°S: -69° high at 9 pm APR at 20°S: -55° high at 9 pm MAY at 20°S: -33° high at 9 pm JUN at 20°S: -10° high at 9 pm JUL at 20°S: 10° high at 9 pm AUG at 20°S: 25° high at 9 pm SEP at 20°S: 29° high at 9 pm OCT at 20°S: 22° high at 9 pm NOV at 20°S: 5° high at 9 pm DEC at 20°S: -16° high at 9 pm 30°S
JAN at 30°S: -44° high at 9 pm FEB at 30°S: -67° high at 9 pm MAR at 30°S: -79° high at 9 pm APR at 30°S: -61° high at 9 pm MAY at 30°S: -39° high at 9 pm JUN at 30°S: -17° high at 9 pm JUL at 30°S: 2° high at 9 pm AUG at 30°S: 15° high at 9 pm SEP at 30°S: 19° high at 9 pm OCT at 30°S: 13° high at 9 pm NOV at 30°S: -2° high at 9 pm DEC at 30°S: -22° high at 9 pm 40°S
JAN at 40°S: -49° high at 9 pm FEB at 40°S: -71° high at 9 pm MAR at 40°S: -88° high at 9 pm APR at 40°S: -65° high at 9 pm MAY at 40°S: -43° high at 9 pm JUN at 40°S: -23° high at 9 pm JUL at 40°S: -6° high at 9 pm AUG at 40°S: 6° high at 9 pm SEP at 40°S: 9° high at 9 pm OCT at 40°S: 4° high at 9 pm NOV at 40°S: -10° high at 9 pm DEC at 40°S: -27° 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 49°S, and never sets north of 49°N.
LBN 240 is 3,270 light-years away
The light seen from LBN 240 tonight left it about 3,270 years ago. Distance source: Collinder 419, Gaia DR3, Hunt and Reffert 2023.
92 Lynds bright nebulae and 43 Lynds dark nebulae lie within 5° of LBN 240
The nearest:
LBN 241, emission nebula, 0′ LDN 888, dark nebula, 11′ LBN 248, emission nebula, 32′ LDN 886, dark nebula, 42′ LBN 236, emission nebula, 46′ LDN 881, dark nebula, 55′ LDN 883, dark nebula, 59′ LDN 882, dark nebula, 1.0° LBN 234 Sadr Region, emission nebula, 1.1° LDN 889, dark nebula, 1.1°
NGC and IC objects in the field that are brighter than magnitude 12.5 or have their own page:
IC 1318 Sadr Region, star, 37′ NGC 6910, open cluster, 40′ M29 Cooling Tower, open cluster, 2.3° NGC 6888 Crescent Nebula, H II region, 2.7° IC 4996, open cluster, 3.2° NGC 6866, open cluster, 4.6°
LBN 240 catalog data
Field Value
Designations LBN 240 Constellation Cygnus Type emission nebula Right ascension (J2000) 20h 19.7m Declination (J2000) +40° 39′ Galactic longitude and latitude 78.21°, +2.48° Brightness class 4 of 6 (moderately faint) Color class 3 of 4 (reddish) Apparent size 2° × 1° True size 114 light-years Distance 3,270 light-years (Collinder 419, Gaia DR3, Hunt and Reffert 2023) Best with Camera Best month September Catalog page LBN 1 to 500
