Coord 2000 | 02318+8916 | Discov num | STF 93 | Comp | BC | Coord arcsec 2000 | 02 30 43.45 +89 15 38.6 | ||||
Date first | 2005 | Date last | 2015 | Obs | 4 | ||||||
Pa first | 81 | Pa last | 83.2 | P.A. Now (θ) | 83.2° | ||||||
Sep first | 53.0 | Sep last | 53.087 | Sep. Now (ρ) | 53.087" | ||||||
Mag pri | 9.10 | Mag sec | 13.80 | delta mag (ΔM) | 4.7 | Spectral class | |||||
Pri motion ra | Sec motion ra | ||||||||||
Pri motion dec | Sec motion dec | ||||||||||
Notes | N (See Notes) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | 308 | 02 31 49 +89 15 51 | WRH 39 Aa,Ab | 2014 | 8 | 175 | 0.1 | 2.30 | 4.30 | 2.00 | Y | ||
Show | Polaris | 308 | 02 31 49 +89 15 51 | STF 93 AB | 2016 | 65 | 236 | 18.4 | 2.04 | 9.10 | 7.06 | ||
Show | 308 | 02 31 49 +89 15 51 | STF 93 AC | 2016 | 7 | 103 | 39.0 | 2.04 | 13.80 | 11.76 | |||
Show | 308 | 02 31 49 +89 15 51 | STF 93 AD | 2016 | 8 | 194 | 83.2 | 2.04 | 14.30 | 12.26 | |||
Show | 02 30 43 +89 15 39 | STF 93 BC | 2015 | 4 | 83 | 53.1 | 9.10 | 13.80 | 4.70 | <=== | |||
Show | 02 30 43 +89 15 39 | STF 93 BD | 2014 | 3 | 179 | 69.4 | 9.10 | 14.30 | 5.20 |
Constellation | Ursa Minor | Gaia DR2 | 576402619921510144 |
discov_num | notes | refcode |
STF 93 | alp Umi = 1 UMi = Polaris. Cepheid variable and spectroscopic binary, | |
P = 30y. A close companion has been suspected. The close pair, | ||
measured three time from 1937-1939 by R.H. Wilson using an eyepiece | WRH1941b | |
interferometer, was not seen again until Evans et al. (2006) resolved | Evs2006 | |
it with HST. Wilson's measures agree with the combined astrometric/ | ||
spectroscopic solution by Gerasimovic (1936), although both orbit and | Ger1936 | |
measures are called into dispute by the more recent orbit of Wielan et | Wln2000 | |
al. (2000), whose solution includes mass estimates, etc. | ||
NPOI Limb-darkened diameter 3.28 +/- 0.02 mas, | NOI1999 | |
R = 46. +/- 3. \rsun. | ||
An earlier orbit by Wyller (1957) was rejected from Fourth Orbit | Wye1957 | |
Catalog ("amplitude below noise level") | Wor1983 | |
Component B = BD+88@@@7. See discussion of this system by Roemer. | Re_1965 | |
While Hipparcos parallax of A 7.56 +/- 0.48 from the original mission | HIP1997a | |
and 7.54 +/- 0.011 mas from the re-reduction, the HST-FGS parallax of | VlF2007 | |
B = 6.26 +/- 0.24 mas implies that that A is high luminosity and | BdH2018 | |
pulsating in the second overtone if AB is physical, i.e., the distance | ||
to B is the same as A. | ||
The C component was observed by Burnham in the late 19th century, then | Bu_1894 | |
not seen again until the early 21st century by Daley and Ashcroft. | Dal2006a | |
The extremely large magnitude makes the pair too close for most large | ||
astrometric surveys. | ||
The D component has also been recently recovered in 2MASS data. | TMA2003 | |
According to Jim Daley, the R-I color for C is 0.56 and for D it is | ||
0.67. The V-I color for D is 1.08. | Dal2006b | |
AB: H 4 1. | MEv2010 |
refcode | metd | author | reference |
BdH2018 | not - | Bond, H.E., Nelan, E.P., Evans, N.R., Schaefer, G.H. & Harmer, D. | 2018ApJ...853...55B |
BdH2018 | ApJ 853, 55, 2018 | ||
Bu_1894 | Ma j | Burnham, S.W. | 1894PLicO...2....3B |
Bu_1894 | Pub. Lick Obs. 2, 3, 1894 (includes most data from Bu_1893a) | 1893AN....131..329B | |
Dal2006a | C u | Daley, J.A. | 2006JDSO....2...44D |
Dal2006a | JDSO 2, 44, 2006 | ||
Dal2006b | - | Daley, J.A. | 2006JDSO....2...51D |
Dal2006b | JDSO 2, 51, 2006 | ||
Evs2006 | H j | Evans, N.R., Franz, O., Massa, D., Mason, B., Walker, R.L., & Marovska, M. | 2006PASP..118.1545E |
Evs2006 | +S | PASP 118, 1545, 2006 | |
Ger1936 | orb - | Gerasimovic, B.P. | . |
Ger1936 | Pulkova Obs. Circ. #19, 1, 1936 | ||
HIP1997a | Hh - | Hipparcos | 1997yCat.1239....0E |
HIP1997a | Hipparcos Catalog, ESA SP-1200, 1997 (incl. Hp photometry, vol. 10) | ||
MEv2010 | - | MacEvoy, B. | ................... |
MEv2010 | private communication, 2010 (see http://www.handprint.com/ASTRO/index.html) | ||
NOI1999 | not j | Nordgren, T.E., Germain, M.E., Benson, J.A., Mozurkewich, D., Sudol, J.J., Elias, | 1999AJ....118.3032N |
NOI1999 | II, N.M., Hajian, A.R., White, N.M., Hutter, D.J., Johnston, K.J., Gauss, F.S., | . | |
NOI1999 | Armstrong, J.T., Pauls, T.A. & Rickard, L.J. | . | |
NOI1999 | AJ 118, 3032, 1999 | . | |
Re_1965 | - | Roemer, E. | 1965ApJ...141.1415R |
Re_1965 | ApJ 141, 1415, 1965 | ||
TMA2003 | E2 j | 2MASS Catalog | . |
TMA2003 | 2MASS Point Src Cat., 2003 all-sky release (http://pegasus.phast.umass.edu/) | ||
TMA2003 | (Note: 2MASS photometry also added by cataloguer to 2MASS astrometry published | ||
TMA2003 | under other references.) | ||
TMA2003 | Thurgood Marshall High School | ||
VlF2007 | - | van Leeuwen, F. | 2007A&A...474..653V |
VlF2007 | A&A 474, 653, 2007 | ||
Wln2000 | orb - | Wielen, R., Jahreiss, H., Dettbarn, C., Lenhardt, H., & Schwan, H. | 2000A&A...360..399W |
Wln2000 | A&A 360, 399, 2000 | ||
Wor1983 | - | Worley, C.E. & Heintz, W.D. | 1983PUSNO..24g...1W |
Wor1983 | Pub. USNO 24, Pt. 7, 1983 (Fourth Orbit Catalog) | ||
WRH1941b | J - | Wilson, R.H. | 1941PFAO....6b...1W |
WRH1941b | +Ma | Pub. Univ. Penn. 6, Pt.4, 21, 1941 | |
WRH1941b | (U and T coded observations per van den Bos, J Obs 34, 85, 1951) | 1951JO.....34...85V | |
Wye1957 | orb - | Wyller, A.A. | 1957AJ.....62..384W |
Wye1957 | AJ 62, 384, 1957 |
idgroup | discov | author |
1 | STF | Struve, F.G.W. |
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
02318+8916 | STF 93 | BC | 2005 | 2 | 85 | 53.2 | 9.10 | 13.10 | N | 023043.45+891538.6 | |
02318+8916 | STF 93 | BC | 2015 | 3 | 83 | 53.1 | 9.10 | 13.80 | N | 023043.45+891538.6 |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
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A | Ab | B | C | |
Ab | pa=179.9° sep=0.08" | |||
B | pa=226.3° sep=17.52" | pa=226.5° sep=17.47" | ||
C | pa=176.8° sep=8.65" | pa=176.7° sep=8.57" | pa=75.3° sep=13.63" | |
D | pa=180.2° sep=80.81" | pa=180.2° sep=80.73" | pa=169.7° sep=69.86" | pa=180.6° sep=72.18" |
Common name | Polaris | Other names | Lodestar, Cynosura, Alruccabah, Phoenice, Polare, Stella Polare, Tramontana, Angel Stern, Navigatoria, Star of Arcady, Yilduz, Mismar, Polyarnaya | Coord arcsec 2000 | 023149.09+891550.7 | Mag | 2.04 | ||||
Spectral class | F7Ib (yellow-white) | PmRA | 38.00 | PmDE | -15.0 | SAO | 308 | ||||
HIP | 11767 | Tycho2 | 4628-00237-1 | HD | 8890 | HR | 424 | ||||
GC | 2243 | BD | BD+88 8 | Bayer | Alpha Ursae Minoris | Bayer name | Alp UMi | ||||
Flamsteed | 1 Ursae Minoris | Flamsteed name | 1 UMi | FK5 | 907 |
Tycho2 | 4628-00237-1 | Pflag | X | RAmdeg | DEmdeg | ||||||
PmRA | PmDE | E RAmdeg | E DEmdeg | ||||||||
E pmRA | E pmDE | EpRAm | EpDEm | ||||||||
Num | Q RAmdeg | Q DEmdeg | Q pmRA | ||||||||
Q pmDE | BTmag | 2.708 | E BTmag | 0.014 | VTmag | 2.038 | |||||
E VTmag | 0.009 | Prox | 999 | TYC | T | HIP | 11767 | ||||
CCDM | RAdeg | 37.94661861 | DEdeg | 89.26413528 | EpRA 1990 | 1.69 | |||||
EpDE 1990 | 1.75 | E RAdeg | 3.2 | E DEdeg | 3.2 | Posflg | |||||
Corr | 0.1 |
SAO | 308 | DelFlag | RA1950 | PmRA1950 | 0.1811 | ||||||
DE1950 | PmDE1950 | -0.004 | Vmag | 2.1 | SpType | F8v | |||||
Double code | Source | 74 | CatNum | 907 | DM | BD+88 8 | |||||
DMcomp | BDsup | HD | 8890 | M HD | 0 | ||||||
GC | 2243 | RA1950rad | 0.47478668 | DE1950rad | 1.55384597 | PmRA2000 | 0.2012 | ||||
PmDE2000 | -0.016 |
Catalog | H | HIP | 11767 | Proxy | RAhms | 02 31 47.08 | |||||
DEdms | +89 15 50.9 | Vmag | 1.97 | VarFlag | 1 | R Vmag | H | ||||
RAdeg | 37.9461 | DEdeg | 89.2641 | AstroRef | Plx | 7.56 | |||||
CCDM | 02319+8915 | N CCDM | I | Nsys | 1 | Ncomp | 1 | ||||
MultFlag | Source | Qual | M HIP | ||||||||
Theta | Rho | HD | 8890 | BD | BD+88 8 | ||||||
CD | CP | Dm number | +88 8 | VIred | 0.68 | ||||||
SpType | F7:Ib-IIv SB | R SpType | Coord arcsec 2000 | 023147.08+891550.9 |
HIP | 11767 | Sn | 5 | So | 0 | Nc | 1 | ||||
RArad | 0.6622851337 | DErad | 1.5579531082 | Plx | 7.54 | PmRA | 44.48 | ||||
PmDE | -11.85 | E RArad | 0.09 | E DErad | 0.1 | E Plx | 0.11 | ||||
E pmRA | 0.11 | E pmDE | 0.13 | Hpmag | 2.1077 | E Hpmag | 0.0021 | ||||
SHp | 0.014 | VA | 1 | BV | 0.636 | E BV | 0.003 | ||||
VI | 0.7 |
Coord arcsec 2000 | 023149.09+891550.6 | Mag | 4.3 | Spectral class | IIv | Calc delta mag | 2 | ||||
Calc coord | yes |
Coord arcsec 2000 | 023043.45+891538.6 | Coord calc | 023043.45+891538.6 | Mag | 9.1 | Calc delta mag | 6.8 |
Coord arcsec 2000 | 023151.62+891542.1 | Mag | 13.8 | Spectral class | II | Calc delta mag | 11.5 | ||||
Calc coord | yes |
Coord arcsec 2000 | 023147.78+891429.9 | Mag | 14.3 | Spectral class | II | Calc delta mag | 12 | ||||
Calc coord | yes |