Coord 2000 | 17419+7209 | Discov num | STF2241 | Comp | AB | Coord arcsec 2000 | 17 41 56.36 +72 08 55.8 | ||||
Date first | 1800 | Date last | 2019 | Obs | 183 | ||||||
Pa first | 14 | Pa last | 14 | P.A. Now (θ) | 14° | ||||||
Sep first | 32.0 | Sep last | 29.6 | Sep. Now (ρ) | 29.6" | ||||||
Mag pri | 4.60 | Mag sec | 5.59 | delta mag (ΔM) | 0.99 | Spectral class | F5IV+F8V (yellow-white/yellow-white) | ||||
Pri motion ra | +027 | Sec motion ra | +029 | ||||||||
Pri motion dec | -270 | Sec motion dec | -277 | ||||||||
Notes | N O Z (See Notes, Orbital solution, Parallax indicates components are physical) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | Dziban | 8890 | 17 41 56 +72 08 56 | STF 2241 AB | 2019 | 183 | 14 | 29.6 | 4.60 | 5.59 | 0.99 | Y | <=== |
Show | 8890 | 17 41 56 +72 08 56 | STF 2241 AC | 2004 | 14 | 107 | 78.1 | 4.60 | 11.05 | 6.45 | |||
Show | 8890 | 17 41 56 +72 08 56 | STF 2241 AD | 2004 | 3 | 66 | 105.9 | 4.60 | 12.98 | 8.38 | |||
Show | 8890 | 17 41 56 +72 08 56 | PIN 11 AE | 1999 | 1 | 144 | 69.0 | 3.50 | 14.18 | 10.68 | |||
Show | 17 42 13 +72 08 32 | STF 2241 CD | 2015 | 8 | 19 | 69.4 | 11.05 | 12.98 | 1.93 |
Common name | Dziban | Constellation | Draco | SAO | 8890 | HIP | 86614 | ||||
Tycho2 | 4436-01425-1 | Gaia DR2 | 1651268660202647296 | HD | 162003 | HR | 6636 | ||||
GC | 24089 | ADS | 10759 | GL | Gl 694.1A | DM | BD+72 805 | ||||
BD | BD+72 804 | Bayer | Psi Draconis | Bayer name | Psi Dra | Flamsteed | 31 Draconis | ||||
Flamsteed name | 31 Dra | FK5 | 670 | Distance | 22.84 | Distance ly | 74.5 | ||||
Bayer greek | ψ Dra |
Other names | DSIBAN |
Meaning | the two jackals |
Period (P) | 100c | ± 33 | Periastron (T) | 3817y | ± 500 | Semi-major axis (a) | 31a | ± 7 |
Eccentricity (e) | 0.28 | ± 0.07 | Inclination (i) | 55° | ± 4 | Longitude of periastron (ω) | 99° | ± 36 |
Node (Ω) | 16° | ± 1 | Notes | n | Reference | Kis2009 | ||
Equinox | Last observation | 2001 | Grade | 5 | (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 |
STF2241 | psi 1 Dra = Dziban. LDS1874. B is BD+72@805. | |
CHARA Array Limb-darkened diameter 0.949 +/- 0.026 mas, | CIA2012e | |
R = 2.329 +/- 0.067 \rsun, L = 6.343 +/-0.153 \lsun, | ||
Teff = 6014 +/- 90 K, M = 1.311 +/- 0.016 \msun, | ||
Age = 3.8 +/- 0.1 Gyr. | ||
A premature orbit has been computed. | ||
A family of possible orbital solutions are determined by Romanenko | Rmn1994 | |
(1994), with periods ranging from 5,200 to 120,000 years, using the | ||
method of apparent motion parameters and incorporating parallax and | ||
radial velocity information. | ||
STF2241 | AB: H 4 7. | MEv2010 |
31 Dra. Toyota et al. (2009) monitored the RV of both the A and B | ||
components every 1-2 months between 2003 Mar - 2007 Nov, using a | ||
high-dispersion echelle (precision ~10 m/s). The A component exhibits | ||
a linear trend in RV, with a slope +220 m/s/y. Toyota et al. assert | ||
that these variations are due to an unseen companion. Assuming a | ||
circular orbit, period is estimated at 3200d; minimum mass of the | ||
unseen star ~50 Mjup. Standard deviation of radial velocities for the | ||
B component <40 m/s and velocities show no periodic variation. This | ||
result rejects the association of a planet of mass > 1.8 Mjup | Toy2009 | |
AC: Rectilinear solution by Hurowitz et al. (2014). | USN2014a |
refcode | metd | author | reference |
CIA2012e | not j | Boyajian, T.S., McAlister, H.A., van Belle, G., Gies, D.R., ten Brummelaar, T.A., | 2012ApJ...746..101B |
CIA2012e | von Braun, K., Farrington, C., Goldfinger, P.J., O'Brien, D., Parks, J.R., | . | |
CIA2012e | Richardson, N.D., Ridgway, S., Schaefer, G., Sturmann, L., Sturmann, J., Touhami, | . | |
CIA2012e | Y., Turner, N.H. & White, R. | . | |
CIA2012e | ApJ 746, 101, 2012 | . | |
Kis2009 | orb - | Kiselev, A.A., Romanenko, J.G., & Kalinichenko, O.A. | 2009ARep...53..126K |
Kis2009 | ARep 53, 126, 2009 (SvAL 86, 148, 2009) | ||
MEv2010 | - | MacEvoy, B. | ................... |
MEv2010 | private communication, 2010 (see http://www.handprint.com/ASTRO/index.html) | ||
Rmn1994 | orb - | Romanenko, L.G. | 1994ARep...38..779R |
Rmn1994 | SvA 71, 875, 1994 (ARep 38, 779, 1994) | ||
Toy2009 | rv - | Toyota, E., Itoh, Y., Ishiguma, S., Urakawa, S., Murata, D., Oasa, Y., | 2008PASJ...61...19T |
Toy2009 | Matsuyama, H., Funayama, H., Sato, B., & Mukai, T. | ||
Toy2009 | PASJ 61, 19, 2009 | ||
USN2014a | lin - | Hurowitz, J.L., Hartkopf, W.I., & Mason, B.D. | 2014IAUDS.182....1H |
USN2014a | Inf. Circ. 182, 1, 2014 |
idgroup | discov | author |
1 | PIN | Pinfield, D.J., Jones, H.R.A., Lucas, P.W., Kendall, T.R., Folkes, S.L., |
1 | PIN | Day-Jones, A.C., Chappelle, R.J., & Steele, I.A. |
2 | PIN | Pinfield, D.J., Burningham, B., Lodieu, N., Leggett, S.K., Tinney, C.G., |
2 | PIN | van Spaandonk, L., Marocco, F., Smart, R., Gomes, J., Smith, L., Lucas, P.W., |
2 | PIN | Day-Jones, A.C., et al. |
3 | STF | Struve, F.G.W. |
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
17419+7209 | STF2241 | AB | 2007 | 141 | 16 | 29.9 | 4.60 | 5.59 | F5IV F8V | NODV | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2008 | 143 | 16 | 29.9 | 4.60 | 5.59 | F5IV F8V | NODV | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2009 | 147 | 16 | 30.0 | 4.60 | 5.59 | F5IV F8V | NOD | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2010 | 148 | 16 | 30.0 | 4.60 | 5.59 | F5IV F8V | NOD | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2013 | 166 | 16 | 30.0 | 4.60 | 5.59 | F5IV F8V | NOD | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2014 | 167 | 16 | 30.0 | 4.60 | 5.59 | F5IV F8V | NODZ | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2015 | 172 | 16 | 30.2 | 4.60 | 5.59 | F5IV+F8V | NO Z | 174156.31+720858.2 |
17419+7209 | STF2241 | AB | 2016 | 176 | 16 | 30.1 | 4.60 | 5.59 | F5IV+F8V | NO Z | 174156.36+720855.8 |
17419+7209 | STF2241 | AB | 2017 | 177 | 14 | 30.1 | 4.60 | 5.59 | F5IV+F8V | NO Z | 174156.36+720855.8 |
17419+7209 | STF2241 | AB | 2018 | 180 | 17 | 30.1 | 4.60 | 5.59 | F5IV+F8V | NO Z | 174156.36+720855.8 |
17419+7209 | STF2241 | AB | 2019 | 181 | 14 | 29.6 | 4.60 | 5.59 | F5IV+F8V | NO Z | 174156.36+720855.8 |
Show | date | username | difficulty | separation ⇓ | pa_estim | interest | notes |
Show | 22/07/21 | daedalus1 | mean difficulty | separated | 16 | Seeing: Pickering 8, excellent. Measures: theta 016, rho 30.0 +/- 0.212. Busy star field. C component barely visible. |
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 | C | D | |
B | pa=4.4° sep=28.80" | |||
C | pa=107.7° sep=79.11" | pa=125.8° sep=90.18" | ||
D | pa=34.4° sep=52.40" | pa=62.1° sep=31.01" | pa=325.8° sep=81.31" | |
E | pa=167.5° sep=57.27" | pa=173.1° sep=85.24" | pa=243.1° sep=70.62" | pa=189.8° sep=100.62" |
Common name | Dziban | Meaning | the two jackals | Other names | DSIBAN | Coord arcsec 2000 | 174156.36+720855.8 | ||||
Mag | 4.6 | Spectral class | F5IV (yellow-white) | PmRA | 27.00 | PmDE | -270.0 | ||||
SAO | 8890 | HIP | 86614 | Tycho2 | 4436-01425-1 | HD | 162003 | ||||
HR | 6636 | GC | 24089 | ADS | 10759 | BD | BD+72 804 | ||||
Bayer | Psi 1 Draconis | Bayer name | Psi1 Dra | Flamsteed | 31 Draconis | Flamsteed name | 31 Dra | ||||
FK5 | 670 |
Tycho2 | 4436-01425-1 | Pflag | RAmdeg | 265.48480656 | DEmdeg | 72.14884700 | |||||
PmRA | 25.4 | PmDE | -267.8 | E RAmdeg | 4 | E DEmdeg | 3 | ||||
E pmRA | 0.6 | E pmDE | 0.7 | EpRAm | 1990.86 | EpDEm | 1991.38 | ||||
Num | 16 | Q RAmdeg | 2.2 | Q DEmdeg | 1.0 | Q pmRA | 2.7 | ||||
Q pmDE | 1.1 | BTmag | 5.057 | E BTmag | 0.014 | VTmag | 4.600 | ||||
E VTmag | 0.009 | Prox | 302 | TYC | T | HIP | 86614 | ||||
CCDM | A | RAdeg | 265.48461611 | DEdeg | 72.14946139 | EpRA 1990 | 1.65 | ||||
EpDE 1990 | 1.74 | E RAdeg | 3.5 | E DEdeg | 3.4 | Posflg | |||||
Corr | 0.1 |
SAO | 8890 | DelFlag | RA1950 | PmRA1950 | 0.0033 | ||||||
DE1950 | PmDE1950 | -0.267 | Vmag | 4.9 | SpType | F5 | |||||
Double code | Source | 74 | CatNum | 670 | DM | BD+72 804 | |||||
DMcomp | BDsup | HD | 162003 | M HD | 0 | ||||||
GC | 24089 | RA1950rad | 4.63743304 | DE1950rad | 1.25967303 | PmRA2000 | 0.0056 | ||||
PmDE2000 | -0.267 |
Catalog | H | HIP | 86614 | Proxy | RAhms | 17 41 56.31 | |||||
DEdms | +72 08 58.2 | Vmag | 4.57 | VarFlag | R Vmag | H | |||||
RAdeg | 265.485 | DEdeg | 72.1495 | AstroRef | A | Plx | 45.38 | ||||
CCDM | 17420+7209 | N CCDM | I | Nsys | 2 | Ncomp | 1 | ||||
MultFlag | C | Source | P | Qual | D | M HIP | |||||
Theta | Rho | HD | 162003 | BD | BD+72 804 | ||||||
CD | CP | Dm number | +72 804 | VIred | 0.49 | ||||||
SpType | F5IV-V | R SpType | Coord arcsec 2000 | 174156.31+720858.2 |
HIP | 86614 | Sn | 95 | So | 3 | Nc | 1 | ||||
RArad | 4.6335806147 | DErad | 1.2592463153 | Plx | 43.79 | PmRA | 25.32 | ||||
PmDE | -268.47 | E RArad | 0.39 | E DErad | 0.34 | E Plx | 0.45 | ||||
E pmRA | 0.43 | E pmDE | 0.54 | Hpmag | 4.6681 | E Hpmag | 0.0042 | ||||
SHp | 0.005 | VA | 0 | BV | 0.434 | E BV | 0.004 | ||||
VI | 0.5 |
Coord arcsec 2000 | 174156.84+720924.5 | Mag | 5.59 | Spectral class | F8V (yellow-white) | PmRA | 29.00 | ||||
PmDE | -277.0 | SAO | 8891 | HIP | 86620 | Tycho2 | 4436-01424-1 | ||||
HD | 162004 | HR | 6637 | GC | 24090 | ADS | 10759 | ||||
BD | BD+72 805 | Flamsteed | 31 Draconis | Flamsteed name | 31 Dra | Calc delta mag | 0.99 | ||||
Calc coord | yes |
Tycho2 | 4436-01424-1 | Pflag | RAmdeg | 265.49206731 | DEmdeg | 72.15690621 | |||||
PmRA | 29.3 | PmDE | -277.2 | E RAmdeg | 4 | E DEmdeg | 4 | ||||
E pmRA | 1.4 | E pmDE | 1.3 | EpRAm | 1991.50 | EpDEm | 1991.65 | ||||
Num | 9 | Q RAmdeg | 2.0 | Q DEmdeg | 1.0 | Q pmRA | 2.0 | ||||
Q pmDE | 1.0 | BTmag | 6.141 | E BTmag | 0.014 | VTmag | 5.586 | ||||
E VTmag | 0.009 | Prox | 302 | TYC | T | HIP | 86620 | ||||
CCDM | B | RAdeg | 265.49184444 | DEdeg | 72.15753972 | EpRA 1990 | 1.62 | ||||
EpDE 1990 | 1.77 | E RAdeg | 3.7 | E DEdeg | 3.6 | Posflg | |||||
Corr | 0.0 |
SAO | 8891 | DelFlag | RA1950 | PmRA1950 | 0.0041 | ||||||
DE1950 | PmDE1950 | -0.278 | Vmag | 6.1 | SpType | F5 | |||||
Double code | Source | 70 | CatNum | 24090 | DM | BD+72 805 | |||||
DMcomp | BDsup | HD | 162004 | M HD | 0 | ||||||
GC | 24090 | RA1950rad | 4.63755286 | DE1950rad | 1.25981444 | PmRA2000 | 0.0065 | ||||
PmDE2000 | -0.278 |
Catalog | H | HIP | 86620 | Proxy | RAhms | 17 41 58.04 | |||||
DEdms | +72 09 27.3 | Vmag | 5.81 | VarFlag | R Vmag | G | |||||
RAdeg | 265.492 | DEdeg | 72.1576 | AstroRef | B | Plx | 44.8 | ||||
CCDM | 17420+7209 | N CCDM | I | Nsys | 2 | Ncomp | 1 | ||||
MultFlag | C | Source | I | Qual | D | M HIP | |||||
Theta | Rho | HD | 162004 | BD | BD+72 805 | ||||||
CD | CP | Dm number | +72 805 | VIred | 0.6 | ||||||
SpType | G0V | R SpType | Coord arcsec 2000 | 174158.04+720927.3 |
HIP | 86620 | Sn | 95 | So | 3 | Nc | 1 | ||||
RArad | 4.6337064965 | DErad | 1.2593872767 | Plx | 43.36 | PmRA | 34.89 | ||||
PmDE | -275.94 | E RArad | 0.41 | E DErad | 0.37 | E Plx | 0.51 | ||||
E pmRA | 0.48 | E pmDE | 0.59 | Hpmag | 5.868 | E Hpmag | 0.0096 | ||||
SHp | 0 | VA | 0 | BV | 0.53 | E BV | 0 | ||||
VI | 0.6 |
Coord arcsec 2000 | 174212.75+720831.8 | Coord calc | 174212.75+720831.8 | Mag | 11.05 | PmRA | -24.00 | ||||
PmDE | -22.0 | Calc delta mag | 6.45 |
Coord arcsec 2000 | 174202.80+720939.0 | Mag | 12.98 | PmRA | 0.00 | PmDE | -9.0 | ||||
Calc delta mag | 8.38 | Calc coord | yes |
Coord arcsec 2000 | 174159.06+720759.9 | Mag | 14.18 | Spectral class | L? (very deep red) | Calc delta mag | 9.58 | ||||
Calc coord | yes |