VARIABLE STAR

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either:

Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks.
Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it.

No of Observations till 30/09/2024: 26

Variable Star Observation Log

B: Sky is bright, moon, twilight, light pollution, aurorae, U: Clouds, dust, smoke, haze, etc., W: Poor seeing, Y: Outburst

L: Low in the sky, near horizon, in trees, obstructed view, D: Unusual Activity (fading, flare, bizarre behavior, etc.)

K: Non-AAVSO chart. S: Comparison Sequence Problem, Z: Magnitude of star uncertain, I: Identification of star uncertain

V: Faint star, near observing limit, only glimpsed

Star Name: BETELGEUSE, No of Observations Till 29/02/2024: 23

AUID:000-BBK-383 , RA: 05 55 10.30 , Dec: +07 24 25.4 , Period: 423 , Mag: 4.57 - 5.1 V

#V, JD: 2458862.14583, Magnitude: 1.2, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460268.15764, Magnitude: 0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460270.20833, Magnitude: 0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460271.14861, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: U
#V, JD: 2460272.19097, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: U
#V, JD: 2460275.20833, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460279.12500, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460280.21042, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460286.07292, Magnitude: 0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460288.21736, Magnitude: 0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460296.12500, Magnitude: <0.25, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460298.14931, Magnitude: 0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460300.14375, Magnitude: <0.25, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460347.11319, Magnitude: <0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: U
#V, JD: 2460348.11319, Magnitude: <0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: U
#V, JD: 2460349.11319, Magnitude: <0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460350.11319, Magnitude: <0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460351.11319, Magnitude: 0.27, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460366.08681, Magnitude: 0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460367.08819, Magnitude: 0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460368.10417, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460369.09375, Magnitude: <0.3, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B
#V, JD: 2460370.06597, Magnitude: <0.25, 1st Comparison Star: ALNILAM, Chart ID:X25078HN, Remarks: B