Coord 2000 | 11182+3132 | Discov num | STF1523 | Comp | AB | Coord arcsec 2000 | 11 18 10.90 +31 31 45.0 | ||||
Date first | 1819 | Date last | 2020 | Obs | 1664 | ||||||
Pa first | 285 | Pa last | 151.5 | P.A. Now (θ) | 142.1° | ||||||
Sep first | 2.6 | Sep last | 2.31 | Sep. Now (ρ) | 2.423" | ||||||
Mag pri | 4.33 | Mag sec | 4.80 | delta mag (ΔM) | 0.47 | Spectral class | F9V+G9V (yellow-white/yellow) | ||||
Pri motion ra | -454 | Sec motion ra | -454 | ||||||||
Pri motion dec | -591 | Sec motion dec | -591 | ||||||||
Notes | N O (See Notes, Orbital solution) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | Alula Australis | 62484 | 11 18 11 +31 31 45 | STF 1523 AB | 2020 | 1664 | 152 | 2.3 | 4.33 | 4.80 | 0.47 | Y | <=== |
Show | 62484 | 11 18 11 +31 31 45 | POP 1219 AC | 2015 | 5 | 331 | 59.7 | 4.33 | 15.00 | 10.67 | |||
Show | 62484 | 11 18 11 +31 31 45 | WTE 1 AD | 2012 | 15 | 136 | 511.4 | 2.14 | 18.75 | 16.61 | |||
Show | 62484 | 11 18 11 +31 31 46 | CHR 178 Ba,Bb | 1994 | 2 | 75 | 0.0 | 4.40 |
Common name | Alula Australis | Var name | NSV5165 UMa | Constellation | Ursa Major | SAO | 62484 | ||||
HIP | 55203 | Tycho2 | 2520-02634-1 | HD | 98231 | HR | 4375 | ||||
GC | 15537 | ADS | 8119 | GL | Gl 423A | BD | BD+32 2132 | ||||
Bayer | Xi Ursae Majoris | Bayer name | Xi UMa | Flamsteed | 53 Ursae Majoris | Flamsteed name | 53 UMa | ||||
Distance | 10.42 | Distance ly | 33.99 | Bayer greek | ξ UMa |
Meaning | first (leap gazelle), South |
Period (P) | 59.8903y | ± 0.0419 | Periastron (T) | 1935.17y | ± 0.0473 | Semi-major axis (a) | 2.50442a | ± 0.00535 |
Eccentricity (e) | 0.40432 | ± 0.00204 | Inclination (i) | 122.187° | ± 0.192 | Longitude of periastron (ω) | 126.964° | ± 0.343 |
Node (Ω) | 100.939° | ± 0.202 | Notes | n | Reference | Izm2019 | ||
Equinox | Last observation | 2015 | Grade | 1 | (1=Definitive, 9=Indet.) |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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Identifier | 11182+3132 STF1523 A |
coord_arcsec_2000 | 111810.90+313144.9 |
Period (P) | 1.834y | Periastron (T) | 1992.29y | Semi-major axis (a) | 0.054a | |||
Eccentricity (e) | 0.61 | Inclination (i) | 91° | Longitude of periastron (ω) | 324° | |||
Node (Ω) | 318° | Notes | n | Reference | Hei1996b | |||
Equinox | Last observation | Grade | 9 | (1=Definitive, 9=Indet.) |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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discov_num | notes | refcode |
STF1523 | xi UMa = 53 UMa = Alula Australis. A is known to have an unseen | |
companion, P = 1.83y. B is a spectroscopic binary. The first binary | ||
star orbit was computed by Savary, a "librarian-observer" at Paris | Sav1830 | |
Observatory giving courses in "social arithmetic," i.e., statistics. | ||
Spectral types and masses of components assigned by ten Brummelaar et | ||
al., based on adaptive optics observations. | TtB2000 | |
Preliminary Keplerian AB 2-orbit model by Soderhjelm (1999) gives | Sod1999 | |
good solution (failure in HIP). | ||
Many-body perturbations observable but not yet studied. Cf. Aa,Bb | ||
analysis in Mason et al. (1995) | Msn1995 | |
Both orbits are visual and spectroscopic. The orbit of the visible | ||
AB pair includes the secular perturbations in inclination, node, | ||
longitude of periastron, and K. Star B is also SB1, P = 3.98 d. | ||
The short-period pair has been resolved by infrared speckle | ||
interferometry | Mcy1983 | |
See Baize & Petit (1989) catalog of doubles with variable component. | Baz1989d | |
HR 4375 (A component of STF1523) was misidentified as HR 4374 (B | ||
component) in McAlister (1978). | McA1978c | |
An orbital analysis of xi UMa, including the AB pair, the astrometric | ||
companion, and the newly-discovered Bc companion, has been published | ||
by Mason et al. (1995). | Msn1995 | |
AB: H 1 2. | MEv2010 | |
CHR 178 | Bb. Abt & Biggs (1972) note variable RV. | AbH1972 |
Given the typical lack of accuracy associated with astrometric orbits | Tok2010b | |
it is possible that in the doubling of peaks CHR 178 is actually the | ||
known Aa,Ab observing when the faint Ab was flaring. In this | ||
interpretation, the second elongated observation of CHR 178 is assumed | ||
to be false. | ||
WTE 1 | AD: Faint T8.5 brown dwarf companion at separation ~4000au exhibits | |
common proper motion. IR luminosity and color suggest that mass of | ||
companion 14 and 38 Mjup for system ages 2 and 8 Gyr, respectively. | WtE2013H |
refcode | metd | author | reference |
AbH1972 | - | Abt. H.A. & Biggs, E.S. | 1972bsrv.book.....A |
AbH1972 | Bibliography of Stellar Radial Velocities | ||
Baz1989d | - | Baize, P. & Petit, M. | 1989A&AS...77..497B |
Baz1989d | A&AS 77, 497, 1989 | ||
Izm2019 | orb u | Izmailov, I.S. | 2019AstL...45...30I |
Izm2019 | Ast. Lett. 45, 30, 2019 | ||
Izm2019 | (Orbital elements from weighted solutions used when available (Table 2), | ||
Izm2019 | unweighted elements (Table 1) used for remaining 29 systems.) | ||
McA1978c | Sc j | McAlister, H.A. | 1978PASP...90..288M |
McA1978c | PASP 90, 288, 1978 | ||
Mcy1983 | Si - | McCarthy, D.W. | 1983nssl.conf..107M |
Mcy1983 | +C | IAU Colloq 76, 107, 1983 | |
MEv2010 | - | MacEvoy, B. | ................... |
MEv2010 | private communication, 2010 (see http://www.handprint.com/ASTRO/index.html) | ||
Msn1995 | Sc j | Mason, B.D., McAlister, H.A., Hartkopf, W.I., & Shara, M.M. | 1995AJ....109..332M |
Msn1995 | +orb | AJ 109, 332, 1995 | |
Sav1830 | orb - | Savary | . |
Sav1830 | Conn. des Temps, 1830 | ||
Sod1999 | orb - | Soderhjelm, S. | 1999A&A...341..121S |
Sod1999 | A&A 341, 121, 1999 | ||
Tok2010b | S - | Tokovinin, A. | ................... |
Tok2010b | private communication | ||
TtB2000 | Ac j | ten Brummelaar, T.A., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr., | 2000AJ....119.2403T |
TtB2000 | Turner, N.H., Hartkopf, W.I., & Bagnuolo, W.G., Jr. | ||
TtB2000 | AJ 119, 2403, 2000 (magnitude differences from Mt. Wilson AO) |
idgroup | discov | author |
1 | CHR | Center for High Ang. Res. Astronomy (speckle interferometry systems) |
3 | POP | Popovic, G.M. |
132 | POP | Popovic, G.M. (Cvetkovic, Z., Pavlovic, R., Strigachev, A., Novakovic, B., & |
132 | POP | Popovic, G.M.) |
133 | STF | Struve, F.G.W. |
166 | WTE | Wright, E.L., Skrutskie, M.F., Kirkpatrick, J.D., Gelino, C.R., Griffith, R.L., |
166 | WTE | Marsh, K.A., Jarrett, T., Nelson, M.J., Borish, H.J., Mace, G., Mainzer, A.K., |
166 | WTE | Eisenhardt, P.R., et al. |
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
11182+3132 | STF1523 | AB | 2007 | 1566 | 231 | 1.7 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2008 | 1571 | 225 | 1.6 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2009 | 1579 | 215 | 1.6 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2010 | 1590 | 211 | 1.6 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2011 | 1608 | 198 | 1.5 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2012 | 1608 | 190 | 1.4 | 4.33 | 4.80 | F9V G9V | NOD | 111810.92+313145.1 |
11182+3132 | STF1523 | AB | 2013 | 1612 | 188 | 1.6 | 4.33 | 4.80 | F9V G9V | NOD | 111810.90+313144.9 |
11182+3132 | STF1523 | AB | 2014 | 1600 | 180 | 1.7 | 4.33 | 4.80 | F9V G9V | NOD | 111810.90+313144.9 |
11182+3132 | STF1523 | AB | 2015 | 1614 | 175 | 1.8 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
11182+3132 | STF1523 | AB | 2016 | 1621 | 170 | 1.9 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
11182+3132 | STF1523 | AB | 2017 | 1630 | 164 | 1.9 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
11182+3132 | STF1523 | AB | 2018 | 1639 | 161 | 2.0 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
11182+3132 | STF1523 | AB | 2019 | 1640 | 155 | 2.1 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
11182+3132 | STF1523 | AB | 2020 | 1658 | 152 | 2.3 | 4.33 | 4.80 | F9V+G9V | NO | 111810.90+313145.0 |
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 | B | Bb | C | |
B | pa=42.4° sep=0.95" | |||
Bb | pa=43.1° sep=0.97" | pa=72.3° sep=0.02" | ||
C | pa=334.4° sep=57.70" | pa=333.6° sep=57.35" | pa=333.5° sep=57.36" | |
D | pa=140.6° sep=476.71" | pa=140.8° sep=476.85" | pa=140.8° sep=476.84" | pa=142.1° sep=532.92" |
Common name | Alula Australis | Meaning | first (leap gazelle), South | Coord arcsec 2000 | 111810.90+313145.0 | Mag | 4.33 | ||||
Spectral class | F9V (yellow-white) | PmRA | -454.00 | PmDE | -591.0 | HIP | 55203 | ||||
Tycho2 | 2520-02634-1 | HD | 98231 | HR | 4375 | GC | 15537 | ||||
BD | BD+32 2132 | Bayer | Xi Ursae Majoris | Bayer name | Xi UMa | Flamsteed | 53 Ursae Majoris | ||||
Flamsteed name | 53 UMa |
Tycho2 | 2520-02634-1 | Pflag | P | RAmdeg | 169.54548201 | DEmdeg | 31.52919433 | ||||
PmRA | -453.7 | PmDE | -591.4 | E RAmdeg | 3 | E DEmdeg | 4 | ||||
E pmRA | 4.4 | E pmDE | 4.1 | EpRAm | 1991.75 | EpDEm | 1991.57 | ||||
Num | 3 | Q RAmdeg | 0.0 | Q DEmdeg | 2.0 | Q pmRA | 0.2 | ||||
Q pmDE | 2.0 | BTmag | 4.920 | E BTmag | 0.014 | VTmag | 4.327 | ||||
E VTmag | 0.009 | Prox | 10 | TYC | HIP | ||||||
CCDM | RAdeg | 169.54664306 | DEdeg | 31.53051583 | EpRA 1990 | 1.75 | |||||
EpDE 1990 | 1.60 | E RAdeg | 3.3 | E DEdeg | 3.5 | Posflg | D | ||||
Corr | 0.1 |
Catalog | H | HIP | 55203 | Proxy | RAhms | 11 18 11.24 | |||||
DEdms | +31 31 50.8 | Vmag | 3.79 | VarFlag | R Vmag | G | |||||
RAdeg | DEdeg | AstroRef | Plx | ||||||||
CCDM | 11182+3132 | N CCDM | I | Nsys | 1 | Ncomp | |||||
MultFlag | Source | Qual | S | M HIP | |||||||
Theta | Rho | HD | 98230 | BD | BD+32 2132 | ||||||
CD | CP | Dm number | +32 2132 | VIred | 0.68 | ||||||
SpType | G0V | R SpType | Coord arcsec 2000 | 111811.24+313150.8 |
Ccdm | 11182+3132 | RComp | Comp | A | Note1 | ||||||
Note2 | @ | Discov num | DRAs | -1.05 | DDEs | -14.4 | |||||
R dRAs | 10 | Year | Theta | Rho | |||||||
Obs | 2 | Vmag | 4.4 | Sp | G0 | PmNote | * | ||||
PmRA | -429 | PmDE | -586 | Dm number | +32 2132 | Cat1 | BD | ||||
Name2 | 62484 | Cat2 | SAO | HD | 98231 | M HD | |||||
ADS BDS | A 8119 | M ADS BDS | N IDS | IDS | 11128N3206A | ||||||
HIC | 55203 |
Coord arcsec 2000 | 111810.95+313145.7 | Coord calc | 111810.97+313143.0 | Mag | 4.4 | Mag composta | 4.8 | ||||
Spectral class | G0V (yellow) | PmRA | -454.00 | PmDE | -591.0 | SAO | 62484 | ||||
Tycho2 | 2520-02634-2 | HD | 98230 | HR | 4374 | Flamsteed | 53 Ursae Majoris | ||||
Flamsteed name | 53 UMa | Calc delta mag | 0.07 |
Tycho2 | 2520-02634-2 | Pflag | P | RAmdeg | 169.54548201 | DEmdeg | 31.52919433 | ||||
PmRA | -453.7 | PmDE | -591.4 | E RAmdeg | 3 | E DEmdeg | 4 | ||||
E pmRA | 4.4 | E pmDE | 4.1 | EpRAm | 1991.75 | EpDEm | 1991.57 | ||||
Num | 3 | Q RAmdeg | 0.0 | Q DEmdeg | 2.0 | Q pmRA | 0.2 | ||||
Q pmDE | 2.0 | BTmag | 5.530 | E BTmag | 0.014 | VTmag | 4.804 | ||||
E VTmag | 0.009 | Prox | 10 | TYC | HIP | ||||||
CCDM | RAdeg | 169.54684333 | DEdeg | 31.53072611 | EpRA 1990 | 1.76 | |||||
EpDE 1990 | 1.59 | E RAdeg | 3.4 | E DEdeg | 3.7 | Posflg | D | ||||
Corr | 0.1 |
SAO | 62484 | DelFlag | RA1950 | PmRA1950 | -0.0339 | ||||||
DE1950 | PmDE1950 | -0.591 | Vmag | 3.9 | SpType | G0 | |||||
Double code | Source | 70 | CatNum | 15537 | DM | BD+32 2132 | |||||
DMcomp | BDsup | HD | 98230 | M HD | 9 | ||||||
GC | 15537 | RA1950rad | 2.9475093 | DE1950rad | 0.5552032 | PmRA2000 | -0.0338 | ||||
PmDE2000 | -0.586 |
Coord arcsec 2000 | 111810.95+313145.7 | Calc delta mag | 4.33 | Calc coord | yes |
Coord arcsec 2000 | 111808.95+313237.1 | Mag | 15 | Calc delta mag | 10.67 | Calc coord | yes |
Coord arcsec 2000 | 111834.54+312536.5 | Mag | 18.75 | Spectral class | T8.5 (brown dwarf) | Calc delta mag | 14.42 | ||||
Calc coord | yes |