|
gptkbp:instance_of
|
gptkb:star
|
|
gptkbp:age
|
approximately 1 billion years
600 million years
|
|
gptkbp:apparent_magnitude
|
4.3
3.7
+0.5
|
|
gptkbp:average_temperature
|
7500 K
approximately 8000 K
|
|
gptkbp:common_name
|
gptkb:Alderamin
|
|
gptkbp:companion_separation
|
approximately 50 AU
|
|
gptkbp:components
|
two stars
|
|
gptkbp:constellation
|
gptkb:Cygnus
|
|
gptkbp:contains_star
|
gptkb:Delta_Cygni_B
A-type main-sequence star
|
|
gptkbp:coordinates
|
+30.0°
120.0°
l = 75.0°, b = +2.0°
|
|
gptkbp:cultural_heritage
|
20 Cygni
|
|
gptkbp:cultural_references
|
mentioned in various star catalogs
|
|
gptkbp:cultural_symbol
|
gptkb:true
|
|
gptkbp:declination
|
+61° 46′ 50″
+30° 24' 27''
|
|
gptkbp:discovered_by
|
gptkb:William_Herschel
|
|
gptkbp:discovery_year
|
1783
|
|
gptkbp:distance
|
approximately 50 light years
15.3 parsecs
|
|
gptkbp:distance_from_earth
|
50 light years
|
|
gptkbp:eccentricity
|
0.2
|
|
gptkbp:has_bayer_designation
|
gptkb:Delta_Cygni
|
|
gptkbp:has_color
|
gptkb:white
0.1
0.3
|
|
gptkbp:has_henry_draper_designation
|
HD 187642
|
|
gptkbp:has_historical_significance
|
used by ancient navigators
|
|
gptkbp:has_luminosity
|
20 solar luminosities
|
|
gptkbp:has_mechanic
|
-0.020 arcseconds/year
-0.045 arcseconds/year
+20.0 mas/yr
-10.0 mas/yr
|
|
gptkbp:has_radius
|
1.8 solar radii
|
|
gptkbp:has_spectral_type
|
gptkb:A5_V
A-type
A7 V
|
|
gptkbp:has_title
|
HIP 100453
Hip 97834
|
|
gptkbp:historical_significance
|
used for navigation
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Delta Cygni
|
|
gptkbp:included
|
star catalogs
|
|
gptkbp:is_associated_with
|
gptkb:mythology
|
|
gptkbp:is_known_for
|
brightness
its binary nature
|
|
gptkbp:is_located_in
|
gptkb:Northern_Hemisphere
|
|
gptkbp:is_located_near
|
50 light years from Earth
|
|
gptkbp:is_observed_in
|
telescopes
amateur astronomy
|
|
gptkbp:is_part_of
|
gptkb:star
gptkb:scientific_research
gptkb:Milky_Way_Galaxy
star charts
constellation Cygnus
star clusters
stellar nurseries
astronomical catalogs
stellar associations
|
|
gptkbp:is_referenced_in
|
astronomical literature
|
|
gptkbp:is_studied_for
|
stellar evolution
|
|
gptkbp:is_studied_in
|
astrophysics
|
|
gptkbp:is_used_in
|
gptkb:navigation
celestial navigation
|
|
gptkbp:is_visible_from
|
gptkb:Earth
gptkb:true
high
summer months
visible to the naked eye
|
|
gptkbp:known_as
|
gptkb:Alderamin
|
|
gptkbp:lighting
|
not variable
|
|
gptkbp:location
|
northern hemisphere
|
|
gptkbp:mass
|
1.5 solar masses
|
|
gptkbp:mass_ratio
|
1.67
|
|
gptkbp:metallicity
|
solar metallicity
|
|
gptkbp:orbital_period
|
approximately 10 days
10.2 days
|
|
gptkbp:parallax
|
0.065 arcseconds
|
|
gptkbp:primary_star
|
gptkb:Delta_Cygni_A
|
|
gptkbp:region
|
Galactic Plane
|
|
gptkbp:right_ascension
|
20h 42m 42.0s
20h 25m 24.0s
|
|
gptkbp:rotation_period
|
approximately 12 days
|
|
gptkbp:scientific_classification
|
gptkb:star
|
|
gptkbp:secondary_star
|
gptkb:Delta_Cygni_B
|
|
gptkbp:specification
|
Delta Cyg
|
|
gptkbp:system
|
gptkb:true
1 billion years
|
|
gptkbp:type
|
gptkb:star
|
|
gptkbp:type_of
|
gptkb:main-sequence_star
|
|
gptkbp:bfsParent
|
gptkb:Cygnus
|
|
gptkbp:bfsLayer
|
5
|