LBN 640 is an emission nebula in Perseus
LBN 640 is an emission nebula in the constellation Perseus . Lynds rated it brightness class 6 of 6, the faintest, and color class 3, reddish. It spans 35′ × 25′ of sky. It is a faint target for long-exposure photography, and it is highest in the evening sky in December.
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 640 from Ruchbah
Ruchbah
LBN 640
PERSEUS
LBN 640 lies 7.2° southeast of Ruchbah , the magnitude 2.7 star. Three fingers held at arm's length cover about 5°.
LBN 640 is highest in the evening in December
JAN
FEB
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APR
MAY
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JUL
AUG
SEP
OCT
NOV
DEC
60°N
JAN at 60°N: 67° high at 9 pm FEB at 60°N: 52° high at 9 pm MAR at 60°N: 40° high at 9 pm APR at 60°N: 30° high at 9 pm MAY at 60°N: 25° high at 9 pm JUN at 60°N: 24° high at 9 pm JUL at 60°N: 28° high at 9 pm AUG at 60°N: 37° high at 9 pm SEP at 60°N: 49° high at 9 pm OCT at 60°N: 63° high at 9 pm NOV at 60°N: 78° high at 9 pm DEC at 60°N: 81° high at 9 pm 50°N
JAN at 50°N: 64° high at 9 pm FEB at 50°N: 47° high at 9 pm MAR at 50°N: 33° high at 9 pm APR at 50°N: 22° high at 9 pm MAY at 50°N: 15° high at 9 pm JUN at 50°N: 14° high at 9 pm JUL at 50°N: 19° high at 9 pm AUG at 50°N: 30° high at 9 pm SEP at 50°N: 44° high at 9 pm OCT at 50°N: 60° high at 9 pm NOV at 50°N: 78° high at 9 pm DEC at 50°N: 82° high at 9 pm 40°N
JAN at 40°N: 59° high at 9 pm FEB at 40°N: 41° high at 9 pm MAR at 40°N: 26° high at 9 pm APR at 40°N: 13° high at 9 pm MAY at 40°N: 5° high at 9 pm JUN at 40°N: 4° high at 9 pm JUL at 40°N: 10° high at 9 pm AUG at 40°N: 22° high at 9 pm SEP at 40°N: 38° high at 9 pm OCT at 40°N: 55° high at 9 pm NOV at 40°N: 72° high at 9 pm DEC at 40°N: 74° high at 9 pm 30°N
JAN at 30°N: 51° high at 9 pm FEB at 30°N: 34° high at 9 pm MAR at 30°N: 18° high at 9 pm APR at 30°N: 4° high at 9 pm MAY at 30°N: -5° high at 9 pm JUN at 30°N: -6° high at 9 pm JUL at 30°N: 1° high at 9 pm AUG at 30°N: 14° high at 9 pm SEP at 30°N: 30° high at 9 pm OCT at 30°N: 48° high at 9 pm NOV at 30°N: 63° high at 9 pm DEC at 30°N: 65° high at 9 pm 20°N
JAN at 20°N: 43° high at 9 pm FEB at 20°N: 26° high at 9 pm MAR at 20°N: 10° high at 9 pm APR at 20°N: -5° high at 9 pm MAY at 20°N: -14° high at 9 pm JUN at 20°N: -16° 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: 23° high at 9 pm OCT at 20°N: 40° high at 9 pm NOV at 20°N: 54° high at 9 pm DEC at 20°N: 55° high at 9 pm 10°N
JAN at 10°N: 35° high at 9 pm FEB at 10°N: 18° high at 9 pm MAR at 10°N: 2° high at 9 pm APR at 10°N: -14° high at 9 pm MAY at 10°N: -24° high at 9 pm JUN at 10°N: -26° high at 9 pm JUL at 10°N: -18° high at 9 pm AUG at 10°N: -3° high at 9 pm SEP at 10°N: 15° high at 9 pm OCT at 10°N: 32° high at 9 pm NOV at 10°N: 44° high at 9 pm DEC at 10°N: 45° high at 9 pm 0°
JAN at 0°: 26° high at 9 pm FEB at 0°: 10° high at 9 pm MAR at 0°: -6° high at 9 pm APR at 0°: -23° high at 9 pm MAY at 0°: -34° high at 9 pm JUN at 0°: -35° high at 9 pm JUL at 0°: -27° high at 9 pm AUG at 0°: -11° high at 9 pm SEP at 0°: 7° high at 9 pm OCT at 0°: 23° high at 9 pm NOV at 0°: 34° high at 9 pm DEC at 0°: 35° high at 9 pm 10°S
JAN at 10°S: 17° high at 9 pm FEB at 10°S: 2° high at 9 pm MAR at 10°S: -14° high at 9 pm APR at 10°S: -31° high at 9 pm MAY at 10°S: -44° high at 9 pm JUN at 10°S: -45° high at 9 pm JUL at 10°S: -36° high at 9 pm AUG at 10°S: -19° high at 9 pm SEP at 10°S: -1° high at 9 pm OCT at 10°S: 14° high at 9 pm NOV at 10°S: 24° high at 9 pm DEC at 10°S: 26° 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: -22° high at 9 pm APR at 20°S: -40° high at 9 pm MAY at 20°S: -53° high at 9 pm JUN at 20°S: -55° high at 9 pm JUL at 20°S: -44° high at 9 pm AUG at 20°S: -27° high at 9 pm SEP at 20°S: -9° high at 9 pm OCT at 20°S: 5° high at 9 pm NOV at 20°S: 15° high at 9 pm DEC at 20°S: 16° high at 9 pm 30°S
JAN at 30°S: -1° high at 9 pm FEB at 30°S: -15° high at 9 pm MAR at 30°S: -30° high at 9 pm APR at 30°S: -48° high at 9 pm MAY at 30°S: -62° high at 9 pm JUN at 30°S: -65° high at 9 pm JUL at 30°S: -52° high at 9 pm AUG at 30°S: -35° high at 9 pm SEP at 30°S: -17° high at 9 pm OCT at 30°S: -4° high at 9 pm NOV at 30°S: 5° high at 9 pm DEC at 30°S: 6° high at 9 pm 40°S
JAN at 40°S: -11° high at 9 pm FEB at 40°S: -23° high at 9 pm MAR at 40°S: -37° high at 9 pm APR at 40°S: -55° high at 9 pm MAY at 40°S: -71° high at 9 pm JUN at 40°S: -74° high at 9 pm JUL at 40°S: -60° high at 9 pm AUG at 40°S: -42° high at 9 pm SEP at 40°S: -25° high at 9 pm OCT at 40°S: -13° high at 9 pm NOV at 40°S: -5° high at 9 pm DEC at 40°S: -4° 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 36°S, and never sets north of 36°N.
The distance to LBN 640 is not well measured
No reliable distance has been measured for it yet.
3 Lynds bright nebulae and 0 Lynds dark nebulae lie within 5° of LBN 640
The nearest:
NGC and IC objects in the field that are brighter than magnitude 12.5 or have their own page:
LBN 640 catalog data
Field Value
Designations LBN 640 Constellation Perseus Type emission nebula Right ascension (J2000) 01h 49.5m Declination (J2000) +53° 44′ Galactic longitude and latitude 131.54°, -8.16° Brightness class 6 of 6 (the faintest) Color class 3 of 4 (reddish) Apparent size 35′ × 25′ Best with Camera Best month December Catalog page LBN 501 to 1000
