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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:05 
Transit: 12:56 
Sunset: 20:48
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All Constellations » Serpens » 

Alya - θ1 Serpentis (theta1 Serpentis)

Above the horizon.  Rise: 21:49 | Tran: 4:13 | Set: 10:32
Alt: 14.37°   Az: 258.50°   Direction: West-South-West

Alya, also designated as θ1 Serpentis (theta1 Serpentis), is a variable and multiple main-sequence star of spectral class A5 in the constellation of Serpens.

Alya visual magnitude is 4.62. Because of its moderate brightness, Alya is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of Alya - θ1 Serpentis (theta1 Serpentis) star
DSS2 image of Alya. The red arrow shows the motion of Alya during the next 10000 years (8.17 arcmin in Right Ascension and 5.17 arcmin in declination);

Celestial Coordinates

Apparent

18h 57m 28s
+04° 14’ 17”
04h 48m 36s
23h 46m 05s

J2000

18h 56m 13s
+04° 12’ 12”

Galactic Coordinates

37.22°
0.85°

Finder Chart

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Finder chart for Alya - θ1 Serpentis (theta1 Serpentis).

Magnitude, Color, Spectral Class

4.62
Main-sequence

1.59
A5V
8403K

The red dot in the diagram below shows where Alya is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of Alya. Attribution: Richard Powell / CC BY-SA

Star System Properties

Alya is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the Alya double sysyem:

4.62
5.02
0.4
22.2 arcsec

Distance, Radial Speed, Proper Motion

Alya is distant 131.82 light years from the Sun and it is moving towards the Sun at the speed of 46 kilometers per second.

40.44
131.82
-46 km/s
0.049 arcsec/y
0.031"/y

Alternative Designations

Alya
θ1 Serpentis
(theta1 Serpentis)
63 Serpentis
SAO124068
SAO124068

Visibility from Your Location

Today's Alya - θ1 Serpentis (theta1 Serpentis) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 85.8°
Max altitude: 42.8°
Azimuth: 274.2°