21072-1355 STF2752AB

 
 
21h 07m 10.38s -13 55' 22.5" P.A. 185.1 sep 3.47 mag 7.29,9.99 Sp K1V dist. 17.57 pc (57.31 l.y.)
 
 
Coord 2000
21072-1355
Discov num
STF2752
Comp
AB
Coord arcsec 2000
21 07 10.38 -13 55 22.5
Date first
1827
Date last
2015
Obs
32
Pa first
145
Pa last
180
P.A. Now (θ)
185.1°
Sep first
5.2
Sep last
4.4
Sep. Now (ρ)
3.47"
Mag pri
7.29
Mag sec
9.99
delta mag (ΔM)
2.7
Spectral class
K1V (yellow-orange)
Pri motion ra
+382
Sec motion ra
+362
Pri motion dec
-047
Sec motion dec
-033
Notes
N O (See Notes, Orbital solution)
rPM=0.063 (< 0.3, Physical double)
This double is physical.
 
 
21072-1355 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 21072-1355 STF2752 AB 1827 2015 32 185 3.5 7.29 9.99 2.70 Y <===
Show 21072-1355 BU 157 AC 1873 2000 16 287 26.5 7.29 11.56 4.27
Show 21072-1355 KPR 5 AD 1950 2000 4 47 231.2 7.29 12.20 4.91
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
179.9
Precise sep
4.39
Constellation
Aquarius
HIP
104239
Tycho2
5783-01074-1
HD
200968
ADS
14638
GL
Gl 819A
Distance
17.57
Distance ly
57.31
last precise pa
179.9
last precise sep
4.39
 
 
ORBITAL ELEMENTS
 
 
Period (P)507.7y Periastron (T)2124.1y Semi-major axis (a)3.876a
Eccentricity (e)0.45 Inclination (i)54° Longitude of periastron (ω)349.9°
Node (Ω)335.5° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2000
label rho theta
2000 4.008 177.9
2001 3.980 178.3
2002 3.952 178.6
2003 3.923 179.0
2004 3.894 179.4
2005 3.865 179.7
2006 3.836 180.1
2007 3.807 180.5
2008 3.777 180.9
2009 3.747 181.3
2010 3.717 181.7
2011 3.687 182.1
2012 3.656 182.5
2013 3.625 182.9
2014 3.594 183.4
2015 3.563 183.8
2016 3.532 184.2
2017 3.500 184.7
2018 3.469 185.1
2019 3.437 185.6
2020 3.404 186.1
2021 3.372 186.6
2022 3.340 187.1
2023 3.307 187.6
2024 3.274 188.1
2025 3.241 188.6
2026 3.208 189.2
2027 3.175 189.7
2028 3.141 190.3
2029 3.108 190.8
2030 3.074 191.4

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





wds21072-1355a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21072-1355 STF2752 AB 1999 29 177 3.7 7.29 9.99 K1V D 210710.15-135522.1
21072-1355 STF2752 AB 2000 30 178 4.4 7.29 9.99 K1V N D 210710.15-135522.1
21072-1355 STF2752 AB 2010 31 182 3.5 7.29 9.99 K1V NOD 210710.15-135522.1
21072-1355 STF2752 AB 2015 32 180 4.4 7.29 9.99 K1V NO 210710.15-135522.1

If you need more information about this double, apply for a data request form to the WDS.