Alpha Serpentis
V? tri c?a α Serpentis (khoanh tron)
|
D? li?u quan sat
K? nguyen
J2000
Xuan phan
J2000
|
Chom sao
|
C? Xa
|
Xich kinh
|
15
h
44
m
16.07431
s
[1]
|
Xich v?
|
+06° 25′ 32.2633″
[1]
|
C?p sao bi?u ki?n
(V)
|
2.623
[2]
|
Cac đ?c tr?ng
|
---|
|
---|
Ki?u quang ph?
| K2 III
|
Ch? m?c mau
U-B
| +1.248
[2]
|
Ch? m?c mau
B-V
| +1.167
[2]
|
|
Tr?c l??ng h?c thien th?
|
---|
|
---|
V?n t?c xuyen tam
(R
v
)
| +2.63
[3]
km/s
|
Chuy?n đ?ng rieng
(μ)
| RA
:
+133.84
[1]
mas
/
n?m
Dec.
:
+44.81
[1]
mas
/
n?m
|
Th? sai
(π)
| 44.10 ± 0.19
[1]
mas
|
Kho?ng cach
| 74 ± 0.3
ly
(22.68 ± 0.1
pc
)
|
C?p sao tuy?t đ?i
(M
V
)
| +0.88 ± 0.03
[4]
|
|
Chi ti?t
|
---|
|
---|
Ban kinh
| 12
[5]
R
?
|
đ? sang
| 70
[6]
L
?
|
H?p d?n b? m?t
(log
g
)
| 2.5
[7]
cgs
|
Nhi?t đ?
| 4,498
[7]
K
|
đ? kim lo?i
[Fe/H]
| 0.03
[7]
dex
|
T?c đ? t? quay
(
v
sin
i
)
| 4.3
[7]
km
/
s
|
|
Ten g?i khac
|
---|
Unukalhai, Cor Serpentis, 24 Serpentis,
HR
5854,
HD
140573,
SAO
121157,
HIP
77070,
BD
+06° 3088,
ADS
9765,
CCDM
15442+0626.
[8]
|
C? s? d? li?u tham chi?u
|
---|
SIMBAD
| d? li?u
|
Alpha Serpentis
(
α Serpentis
, vi?t t?t
Alpha Ser
,
α Ser
), c?ng đ??c đ?t ten la
Unukalhai
,
[9]
la m?t
ngoi sao đoi
trong ph?n đ?u r?n (Serpens Caput) c?a
chom sao
xich đ?o
C? xa - Serpens
. V?i
c?p sang bi?u ki?n
la 2,6,
[2]
ngoi sao nay la ngoi sao sang nh?t trong chom sao nay va no co th? đ??c nhin b?ng m?t th??ng t? h?u h?t cac n?i tren
Trai đ?t
. Cac phep đo
th? sai
cho phep tinh ra kho?ng cach ??c tinh kho?ng 74
n?m anh sang
(23
parsec
) tinh t?
M?t Tr?i
.
Alpha Serpentis la m?t
ngoi sao kh?ng l?
v?i
phan lo?i sao
K2 III, đa đ?t chay h?t hydro ? loi c?a no va
phat tri?n
ra kh?i
chu?i sao chinh
.
đ??ng kinh goc
đo b?ng
giao thoa k?
c?a ngoi sao nay, sau khi đi?u ch?nh đ? t?i c?a chi, la
4.85 ± 0.05
mas
,
[10]
, ? kho?ng cach ??c tinh, t??ng đ??ng v?i ban kinh v?t ly kho?ng 12 l?n
ban kinh c?a M?t Tr?i
.
[5]
Nhi?t đ? hi?u qu?
c?a l?p v? ngoai la 4.498 K,
[7]
t?o cho no m?t mau cam đ?c tr?ng c?a m?t ngoi sao lo?i K.
[11]
Ngoi sao nay đang t?a ra kho?ng 38 l?n
đ? sang c?a M?t Tr?i
, v?i n?ng l??ng sang h?n 32 l?n đ? sang c?a M?t tr?i đang đ??c phat ra trong vung
h?ng ngo?i
, t?ng s? g?p 70 l?n.
[6]
M?t sao đ?ng hanh co c??ng đ? sang +11,8 ? kho?ng cach goc 58 cung giay t? Alpha Serpentis, trong khi m?t ngoi sao c??ng đ? 13 n?m cach xa sao nay 2,3 phut cung.
α Serpentis
(đ??c Latin hoa thanh
Alpha Serpentis
) la
ten g?i Bayer
c?a h? th?ng sao nay.
No mang nh?ng cai ten truy?n th?ng
Sao Unukalhai
(ho?c đanh v?n
Unuk al Hay
ho?c
Unuk Elhaija)
t?
ti?ng ? R?p
??? ?????
'Unuq al-?ayyati
'c? r?n', va
Cor Serpentis
t?
Latin
'trai tim c?a r?n'. Vao n?m 2016,
Lien minh Thien v?n Qu?c t? đa
t? ch?c m?t Nhom lam vi?c v? Ten Sao (WGSN) đ? l?p danh m?c va chu?n hoa ten rieng cho cac ngoi sao. WGSN đa phe duy?t ten
Unukalhai
cho ngoi sao nay vao ngay 21 thang 8 n?m 2016 va hi?n t?i no đa đ??c đ?a vao Danh m?c ten c?a IAU.
[9]
Alpha Serpentis la m?t thanh vien c?a
kho?nh sao
b?n đ?a ? R?p
al-Nasaq al-Yamani
"Line Nam" c?a
al-Nasaq?n
"hai dong",
[12]
cung v?i
Delta Serpentis
,
Epsilon Serpentis
,
Delta Ophiuchi
,
Epsilon Ophiuchi
,
Zeta Ophiuchi
va
Gamma Ophiuchi
.
[13]
Theo m?t danh m?c
c?a NASA
n?m 1971,
al-Nasaq al-Yam?n?
ho?c
Nasak Yamani
la ten c?a hai ngoi sao:
Delta Serpentis
- ten khac
Nasak Yamani I
va
Epsilon Serpentis
ten khac la
Nasak Yamani II
.
[14]
- ^
a
b
c
d
e
van Leeuwen, F. (thang 11 n?m 2007), “Validation of the new Hipparcos reduction”,
Astronomy and Astrophysics
,
474
(2): 653?664,
arXiv
:
0708.1752
,
Bibcode
:
2007A&A...474..653V
,
doi
:
10.1051/0004-6361:20078357
- ^
a
b
c
d
Gutierrez-Moreno, Adelina; va đ?ng nghi?p (1966),
A System of photometric standards
,
1
, Publicaciones Universidad de Chile, Department de Astronomy, tr. 1?17,
Bibcode
:
1966PDAUC...1....1G
- ^
Famaey, B.; va đ?ng nghi?p (thang 1 n?m 2005), “Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters”,
Astronomy and Astrophysics
,
430
(1): 165?186,
arXiv
:
astro-ph/0409579
,
Bibcode
:
2005A&A...430..165F
,
doi
:
10.1051/0004-6361:20041272
- ^
Carney, Bruce W.; va đ?ng nghi?p (thang 3 n?m 2008), “Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars”,
The Astronomical Journal
,
135
(3): 892?906,
arXiv
:
0711.4984
,
Bibcode
:
2008AJ....135..892C
,
doi
:
10.1088/0004-6256/135/3/892
- ^
a
b
Lang, Kenneth R. (2006),
Astrophysical formulae
, Astronomy and astrophysics library,
1
(?n b?n 3),
Birkhauser
,
ISBN
3-540-29692-1
. The radius (R
*
) is given by:
- ^
a
b
Kaler, James B.,
“UNUKALHAI (Alpha Serpentis)”
,
Stars
,
University of Illinois at Urbana?Champaign
, truy c?p ngay 11 thang 1 n?m 2012
- ^
a
b
c
d
e
Massarotti, Alessandro; va đ?ng nghi?p (thang 1 n?m 2008), “Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity”,
The Astronomical Journal
,
135
(1): 209?231,
Bibcode
:
2008AJ....135..209M
,
doi
:
10.1088/0004-6256/135/1/209
- ^
“UNUKALHAI -- Star in double system”
,
SIMBAD
,
Centre de donnees astronomiques de Strasbourg
, truy c?p ngay 11 thang 1 n?m 2012
- ^
a
b
“IAU Catalog of Star Names”
. Truy c?p ngay 28 thang 7 n?m 2016
.
- ^
Richichi, A.; Percheron, I.; Khristoforova, M. (thang 2 n?m 2005), “CHARM2: An updated Catalog of High Angular Resolution Measurements”,
Astronomy and Astrophysics
,
431
: 773?777,
Bibcode
:
2005A&A...431..773R
,
doi
:
10.1051/0004-6361:20042039
- ^
“The Colour of Stars”
,
Australia Telescope, Outreach and Education
,
CSIRO
, ngay 21 thang 12 n?m 2004,
B?n g?c
l?u tr? ngay 3 thang 12 n?m 2013
, truy c?p ngay 2 thang 4 n?m 2019
- ^
Kunitzsch, P.; Smart, T. (2006),
A Dictionary of Modern Star names: A Short Guide to 254 Star names and Their Derivations
, Cambridge, MA: Sky Publishing, tr. 31,
ISBN
1-931559-44-9
- ^
Allen, R. H.
(1963),
Star Names: Their Lore and Meaning
, New York, NY: Dover Publications Inc, tr.
243
,
ISBN
0-486-21079-0
, truy c?p ngay 12 thang 12 n?m 2010
- ^
Jack W. Rhoads -
B?n ghi nh? k? thu?t 33-507-Danh m?c sao gi?m co 537 ngoi sao đ??c đ?t ten
, Phong thi nghi?m s?c đ?y ph?n l?c, Vi?n cong ngh? California; Ngay 15 thang 11 n?m 1971
L?i chu thich: Th?
<ref>
đ??c đ?nh ngh?a trong
<references>
co ten “aj135_1_209” khong co n?i dung.