Coord 2000 | 19450+4508 |
Discov num | STF2579 |
Comp | AB |
Coord arcsec 2000 | 19 44 58.44 +45 07 50.5 |
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Date first | 1826 |
Date last | 2017 |
Obs | 487 |
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Pa first | 41 |
Pa last | 215 |
P.A. Now (θ) | 214.8° |
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Sep first | 1.9 |
Sep last | 2.7 |
Sep. Now (ρ) | 2.77" |
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Mag pri | 2.89 |
Mag sec | 6.27 |
delta mag (ΔM) | 3.38 |
Spectral class | B9.5IV (blue-white) |
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Pri motion ra | +051 |
Sec motion ra | |||||||||
Pri motion dec | +050 |
Sec motion dec | |||||||||
Notes |
Show | name | SAO | coord_2000 | discov# | comp | first | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | Del Cyg | 48796 | 19450+4508 | STF2579 | AB | 1826 | 2017 | 487 | 215 | 2.8 | 2.89 | 6.27 | 3.38 | Y | <=== |
Show | 48796 | 19450+4508 | STF2579 | AC | 1913 | 2017 | 8 | 67 | 62.5 | 2.89 | 12.00 | 9.11 | |||
Show | 48796 | 19450+4508 | DAL 37 | AD | 1998 | 2007 | 3 | 246 | 42.0 | 2.89 | 14.80 | 11.91 | |||
Show | 48796 | 19450+4508 | DAL 37 | AF | 1998 | 2007 | 3 | 66 | 147.5 | 2.89 | 12.80 | 9.91 | |||
Show | 48796 | 19450+4508 | DAL 37 | DE | 1998 | 2015 | 4 | 251 | 3.5 | 14.80 | 15.20 | 0.40 | |||
Show | 48796 | 19450+4508 | DAL 37 | FG | 2007 | 2015 | 2 | 312 | 3.1 | 13.00 | 13.80 | 0.80 |
Precise pa | 215.2 |
Precise sep | 2.68 |
Name | Del Cyg |
Constellation | Cygnus |
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SAO | 48796 |
HIP | 97165 |
Tycho2 | 3557-02486-1 |
Gaia DR2 | 87999414656 |
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HD | 186882 |
HR | 7528 |
GC | 27347 |
ADS | 12880 |
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BD | BD+44 3234 |
Bayer | Delta Cygni |
Bayer name | Del Cyg |
Flamsteed | 18 Cygni |
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Flamsteed name | 18 Cyg |
Distance | 50.58 |
Distance ly | 164.99 |
last precise pa | 215.2 |
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last precise sep | 2.68 |
Period (P) | 657.1722y | ± 204.03 | Periastron (T) | 1866.357y | ± 15.4645 | Semi-major axis (a) | 2.68872a | ± 0.43688 |
Eccentricity (e) | 0.43962 | ± 0.07552 | Inclination (i) | 154.254° | ± 6.254 | Longitude of periastron (ω) | 151.114° | ± 9.365 |
Node (Ω) | 138.595° | ± 31.21 | Note | Grade | 4 | (1=Definitive, 9=Indet.) | ||
Equinox | Last observation | 2015 |
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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coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
19450+4508 | STF2579 | AB | 2007 | 439 | 222 | 2.5 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2008 | 445 | 220 | 2.8 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2010 | 451 | 220 | 2.7 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2011 | 454 | 216 | 2.5 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2013 | 461 | 218 | 2.5 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2014 | 469 | 218 | 2.6 | 2.89 | 6.27 | B9.5IV | NOD | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2015 | 472 | 217 | 2.7 | 2.89 | 6.27 | B9.5IV | NO | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2016 | 481 | 215 | 2.7 | 2.89 | 6.27 | B9.5IV | NO | 194458.44+450750.5 |
19450+4508 | STF2579 | AB | 2017 | 487 | 215 | 2.7 | 2.89 | 6.27 | B9.5IV | NO | 194458.44+450750.5 |