LBN 21 is an emission nebula in Ophiuchus, 370 light-years away
LBN 21 is an emission nebula in the constellation Ophiuchus , 370 light-years away. Lynds rated it brightness class 3 of 6, moderately bright, and color class 3, reddish. It spans 18′ × 6′ of sky, about 1.9 light-years across. It is a telescope object under a dark sky; a nebula filter helps, and it is highest in the evening sky in July.
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 21 from Han
Han
LBN 21
OPHIUCHUS
LBN 21 lies 2.3° northwest of Han , the magnitude 2.5 star. That is within one binocular field.
LBN 21 is highest in the evening in July
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60°N
JAN at 60°N: -40° high at 9 pm FEB at 60°N: -34° high at 9 pm MAR at 60°N: -23° high at 9 pm APR at 60°N: -8° high at 9 pm MAY at 60°N: 6° high at 9 pm JUN at 60°N: 17° high at 9 pm JUL at 60°N: 20° high at 9 pm AUG at 60°N: 16° high at 9 pm SEP at 60°N: 5° high at 9 pm OCT at 60°N: -9° high at 9 pm NOV at 60°N: -24° high at 9 pm DEC at 60°N: -35° high at 9 pm 50°N
JAN at 50°N: -50° high at 9 pm FEB at 50°N: -41° high at 9 pm MAR at 50°N: -26° high at 9 pm APR at 50°N: -7° high at 9 pm MAY at 50°N: 11° high at 9 pm JUN at 50°N: 25° high at 9 pm JUL at 50°N: 30° high at 9 pm AUG at 50°N: 24° high at 9 pm SEP at 50°N: 10° high at 9 pm OCT at 50°N: -8° high at 9 pm NOV at 50°N: -28° high at 9 pm DEC at 50°N: -43° high at 9 pm 40°N
JAN at 40°N: -60° high at 9 pm FEB at 40°N: -48° high at 9 pm MAR at 40°N: -29° high at 9 pm APR at 40°N: -5° high at 9 pm MAY at 40°N: 16° high at 9 pm JUN at 40°N: 34° high at 9 pm JUL at 40°N: 40° high at 9 pm AUG at 40°N: 33° high at 9 pm SEP at 40°N: 14° high at 9 pm OCT at 40°N: -7° high at 9 pm NOV at 40°N: -31° high at 9 pm DEC at 40°N: -50° high at 9 pm 30°N
JAN at 30°N: -69° high at 9 pm FEB at 30°N: -53° high at 9 pm MAR at 30°N: -30° high at 9 pm APR at 30°N: -4° high at 9 pm MAY at 30°N: 21° high at 9 pm JUN at 30°N: 42° high at 9 pm JUL at 30°N: 50° high at 9 pm AUG at 30°N: 40° high at 9 pm SEP at 30°N: 19° high at 9 pm OCT at 30°N: -6° high at 9 pm NOV at 30°N: -32° high at 9 pm DEC at 30°N: -57° high at 9 pm 20°N
JAN at 20°N: -79° high at 9 pm FEB at 20°N: -57° high at 9 pm MAR at 20°N: -31° high at 9 pm APR at 20°N: -2° high at 9 pm MAY at 20°N: 25° high at 9 pm JUN at 20°N: 49° high at 9 pm JUL at 20°N: 60° high at 9 pm AUG at 20°N: 47° high at 9 pm SEP at 20°N: 22° high at 9 pm OCT at 20°N: -5° high at 9 pm NOV at 20°N: -33° high at 9 pm DEC at 20°N: -61° high at 9 pm 10°N
JAN at 10°N: -88° high at 9 pm FEB at 10°N: -58° high at 9 pm MAR at 10°N: -30° high at 9 pm APR at 10°N: -1° high at 9 pm MAY at 10°N: 28° high at 9 pm JUN at 10°N: 55° high at 9 pm JUL at 10°N: 70° high at 9 pm AUG at 10°N: 53° high at 9 pm SEP at 10°N: 25° high at 9 pm OCT at 10°N: -3° high at 9 pm NOV at 10°N: -33° high at 9 pm DEC at 10°N: -62° high at 9 pm 0°
JAN at 0°: -80° high at 9 pm FEB at 0°: -56° high at 9 pm MAR at 0°: -29° high at 9 pm APR at 0°: 1° high at 9 pm MAY at 0°: 30° high at 9 pm JUN at 0°: 60° high at 9 pm JUL at 0°: 80° high at 9 pm AUG at 0°: 57° high at 9 pm SEP at 0°: 28° high at 9 pm OCT at 0°: -1° high at 9 pm NOV at 0°: -32° high at 9 pm DEC at 0°: -60° high at 9 pm 10°S
JAN at 10°S: -70° high at 9 pm FEB at 10°S: -52° high at 9 pm MAR at 10°S: -27° high at 9 pm APR at 10°S: 3° high at 9 pm MAY at 10°S: 32° high at 9 pm JUN at 10°S: 62° high at 9 pm JUL at 10°S: 89° high at 9 pm AUG at 10°S: 59° high at 9 pm SEP at 10°S: 29° high at 9 pm OCT at 10°S: 0° high at 9 pm NOV at 10°S: -29° high at 9 pm DEC at 10°S: -56° high at 9 pm 20°S
JAN at 20°S: -60° high at 9 pm FEB at 20°S: -46° high at 9 pm MAR at 20°S: -23° high at 9 pm APR at 20°S: 4° high at 9 pm MAY at 20°S: 32° high at 9 pm JUN at 20°S: 60° high at 9 pm JUL at 20°S: 80° high at 9 pm AUG at 20°S: 58° high at 9 pm SEP at 20°S: 30° high at 9 pm OCT at 20°S: 2° high at 9 pm NOV at 20°S: -26° high at 9 pm DEC at 20°S: -49° high at 9 pm 30°S
JAN at 30°S: -50° high at 9 pm FEB at 30°S: -39° high at 9 pm MAR at 30°S: -20° high at 9 pm APR at 30°S: 6° high at 9 pm MAY at 30°S: 31° high at 9 pm JUN at 30°S: 56° high at 9 pm JUL at 30°S: 70° high at 9 pm AUG at 30°S: 54° high at 9 pm SEP at 30°S: 29° high at 9 pm OCT at 30°S: 4° high at 9 pm NOV at 30°S: -22° high at 9 pm DEC at 30°S: -42° high at 9 pm 40°S
JAN at 40°S: -40° high at 9 pm FEB at 40°S: -32° high at 9 pm MAR at 40°S: -15° high at 9 pm APR at 40°S: 7° high at 9 pm MAY at 40°S: 30° high at 9 pm JUN at 40°S: 50° high at 9 pm JUL at 40°S: 60° high at 9 pm AUG at 40°S: 49° high at 9 pm SEP at 40°S: 28° high at 9 pm OCT at 40°S: 5° high at 9 pm NOV at 40°S: -17° high at 9 pm DEC at 40°S: -34° 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 southern hemisphere and north to about 80°N.
LBN 21 is 370 light-years away
The light seen from LBN 21 tonight left it about 370 years ago, around 1656 AD. Distance source: Sh2-27, Zeta Oph Hipparcos 112 pc (van Leeuwen 2007, via HYG v4.1).
10 Lynds bright nebulae and 9 Lynds dark nebulae lie within 5° of LBN 21
The nearest:
LBN 22, emission nebula, 5′ LBN 20, emission nebula, 30′ LBN 24, emission nebula, 1.1° LBN 32, emission nebula, 1.4° LBN 35, emission nebula, 1.8° LDN 238, dark nebula, 1.9° LBN 16, emission nebula, 1.9° LBN 12, emission nebula, 2.2° LBN 30, emission nebula, 2.4° LBN 39, emission nebula, 2.6°
LBN 21 catalog data
Field Value
Designations LBN 21 Constellation Ophiuchus Type emission nebula Right ascension (J2000) 16h 28.8m Declination (J2000) -09° 36′ Galactic longitude and latitude 5.79°, +25.82° Brightness class 3 of 6 (moderately bright) Color class 3 of 4 (reddish) Apparent size 18′ × 6′ True size 1.9 light-years Distance 370 light-years (Sh2-27, Zeta Oph Hipparcos 112 pc (van Leeuwen 2007, via HYG v4.1)) Best with Telescope Best month July Catalog page LBN 1 to 500
