Alphard

Alphard
Alphard se ligging (in die rooi sirkel).
Sterrebeeld	Noordelike Waterslang
Bayer-naam	Alpha Hydrae
Spektraaltipe	K3 II-III[1]
Soort	Reusester
Waarnemingsdata (Epog J2000)
Regte klimming	09h 27m 35.2433s[2]
Deklinasie	-08° 39′ 30.969″[2]
Skynmagnitude (m)	2[1]
Absolute magnitude (M)	-1.69 ± 0,09[3]
B-V-kleurindeks	+1,44[4]
U-B-kleurindeks	+1,73[4]
Besonderhede
Massa (M☉)	3,03 ± 0,36[3]
Radius (R☉)	50,5 ± 4[3]
Ligsterkte (L☉)	780 ± 78[1]
Ouderdom (jaar)	420 miljoen[3]
Temperatuur (K)	4 120[5]
Afstand (ligjaar)	177 ± 8
Rotasiespoed (km/s)	1,1[6]
Metaalinhoud [Fe/H]	-0,06[5]
Ander name
Alfard, Alphart, Kalbelaphard, Cor Hydrae, 30 Hydrae, HR 3748, BD−08° 2680, HD 81797, SAO 136871, FK5 354, HIP 46390[7]
Portaal    Sterrekunde

Alphard^[8] (ook bekend as Alpha Hydrae of α Hya) is die helderste ster in die sterrebeeld Noordelike Waterslang (Hydra). Dit is ’n reusester wat koeler maar helderder as die Son is. Dit is sowat 177 ligjare van hier.

Alphard verskyn op die vlag van Brasilië en simboliseer die deelstaat Mato Grosso do Sul.^[9]

1. ↑ ^{1,0 1,1 1,2} Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa526_A100
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6. ↑ Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa421_241
7. ↑ Verwysingfout: Invalid <ref> tag; no text was provided for refs named SIMBAD
8. ↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2de hersiene uitg.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
9. ↑ "Astronomy of the Brazilian Flag" (in Engels). FOTW Flags Of The World website. 1 Januarie 2019. Geargiveer vanaf die oorspronklike op 30 April 2017. Besoek op 3 Mei 2019.