WDS 13239+5456 SHY 248 CE (Alcor) : NOTES
 
 
discov_num notes refcode
STF1744 A is zet UMa = Mizar. B is 80 UMa = Alcor.
Split by Benedetto Castelli. After resolving AD in C__1616
1617 he wrote to his friend, Galileo, to observe the pair, "It's one of C__1617
the beautiful things in the sky and I don't believe that in our pursuit
one could desire better." Galileo measured it in early 1617. See the G__1617
excellent discussion of its discovery in Leos Ondra's July 2004 Sky &
Telescope article, from which Galileo's measure was extracted. It was
independently found double in 1650 by Jean Baptiste Riccioli in Ric1651
Bologna: "There appears to be one star in the middle of the Great
Bear's tail, where there are actually two, as the telescope reveals."
This was also the first to be observed photographically, by John A.
Whipple with the Harvard 15inch on 27 April 1857. According to Aitken,
this was the first observed photographically (G.P. Bond at Harvard A__1935f
College Observatory in 1857 using an 8 second exposure on a collodion BdG1858
plate), and the first spectroscopic binary discovered (E.C. Pickering Pck1890
in 1889). A is a spectroscopic binary, P = 20.54d (first orbit 1901). Vog1901
B is also a spectroscopic binary (first orbits 1908), P = 175.6d, XXX1908a
spectrum A1m or A1/A2/A7. Also, common proper motion with 80 UMa XXX1908b
80 UMa (Alcor) and other members of the Ursa Major stream.
AC: SHY 247. Bayesian analysis by Shaya & Olling (2011) indicates very Shy2011
high (near 100%) probability pair is physical.
PEA 1 Mistakenly given the discoverer designation 'MKT 8' in the WDS, Pea1925
but actually first resolved by Pease in 1925, six decades before the
Mark III interferometer measures. This system has completed some 1,350
revolutions since its first resolution, probably a record for any
"visual" binary.
The orbit of Aa,Ab by Russell (1927) is combined interferometric/ Rus1927
spectroscopic (double-lined spectrum). A small magnitude difference
(which would probably place the ascending node in the second quadrant)
is uncertain.
Star B (mag. 3.96, 15") is physical, and is itself a 175.55d SB1.
Visual orbit by Hummel et al. (1995) is based on astrometry from the MkT1995
Mark III interferometer. Additional spectroscopic data yield component
masses, luminosities, radii, effective temperatures, and distance.
See Baize & Petit (1989) catalog of doubles with variable component. Baz1989d
Pourbaix gives combined solution for this resolved SB2, yielding
orbital parallaxes and component masses. Pbx2000b
SMR 4 AD: This was the first component of Mizar split by Benedetto Castelli C__1616
in late 1616. It was called "Sidus Ludoviciana" (Ludwig's Star) by XXX2004
Johann Georg Liebnecht for the Landgrave Ludwig of Hessen-Darmstadt
who thought he has discovered a planet. He was wrong.
SHY 247 AE: HIP 65378 + HIP 64532. E component = A component of 13136+5643
= C component of 12487+6019.
SHY 247 AF: HIP 65378 + HIP 65327. F component = D component of 12417+5543.
SHY 248 CE: HIP 65477 + HIP 64532.
SHY 248 CF: HIP 65477 + HIP 65327.
SHY 248 CG: HIP 65477 + HIP 61100. G component = G component of 13136+5643.
SHY 248 CH: HIP 65477 + HIP 61481.
STF1744 AB: H 3 2. MEv2010
 
 
REFERENCES
 
 
refcode metd author reference
A__1935f - Aitken, R.G. 1935QB821.A3.......
A__1935f The Binary Stars, 1935
Baz1989d - Baize, P. & Petit, M. 1989A&AS...77..497B
Baz1989d A&AS 77, 497, 1989
C__1616 V - Castelli, B. 2004S&T...108a..72O
C__1616 (as cited by Ondra, L., S&T, July 2004, p 72)
C__1616 (see also: http://www.leosondra.cz/en/mizar/)
C__1617 not - Castelli, B. 2004S&T...108a..72O
C__1617 +V (as cited by Ondra, L., S&T, July 2004, p 72)
C__1617 (see also: http://www.leosondra.cz/en/mizar/)
G__1617 V - Galileo Galilei 2004S&T...108a..72O
G__1617 +not Galilo manuscript 70 c, 10r, Biblioteca Nazionale Centrale, Florence, p 74
G__1617 (also see Ond2004)
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT1995 Km j Hummel, C.A., Armstrong, J.T., Buscher, D.F., Mozurkewich, D., Quirrenbach, A., & 1995AJ....110..376H
MkT1995 +orb Vivekanand, M.
MkT1995 AJ 110, 376, 1995
Pbx2000b orb - Pourbaix, D. 2000A&AS..145..215P
Pbx2000b A&AS 145, 215, 2000
Pck1890 not - Pickering, E. 1890SidM....9...80P
Pck1890 Siderial Messenger 9, 80, 1890
Pea1925 Jp j Pease, F.G. 1925PASP...37..155P
Pea1925 PASP 37, 155, 1925
Ric1651 V - Riccoli, G.B. 2004S&T...108a..72O
Ric1651 +not (as cited by Ondra, L., S&T, July 2004, p 72)
Ric1651 also see : http://www.leosondra.cz/en/mizar/riccioli/
Rus1927 orb - Russell, H.N. 1927PASP...39..313R
Rus1927 PASP 39, 313, 1927
Shy2011 - Shaya, E.J. & Olling, R. 2011ApJS..192....2S
Shy2011 ApJS 192, 2, 2011
Shy2011 (Statistical analysis of probability that wide Hipparcos pairs are physical. Pairs
Shy2011 added to WDS only if probability 90% or greater.)
Vog1901 not - Vogel, H.C. 1901ApJ....13..324V
Vog1901 ApJ 13, 324, 1890
XXX1908a not - Frost, E.B. 1908AN....177..171F
XXX1908a AN 177, 171, 1908
XXX1908b not - Ludendorff, H. 1908AN....177....7L
XXX1908b AN 177, 7, 1908
XXX2004 not - Ondra, L. 2004S&T...108a..72O
XXX2004 S&T, July 2004, p 72)
XXX2004 also see : http://www.leosondra.cz/en/mizar/riccioli/
 
 
DISCOVERER
 
 
idgroup discov author
1 PSF Project Sixteen Forty - see Zmm2010
1 SMR Schlimmer, J.
56 STF Struve, F.G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
13239+5456 SHY 248 CE 1999 3 317 999.9 4.01 6.88 A5V G1Va NVD 132513.53+545916.6

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