16420+7353 MLR 198

 
 
16h 41m 57.22s +73 53' 14.3" P.A. 44.2 sep 0.27 mag 7.30,7.60 Sp A2 dist. 107.87 pc (351.87 l.y.)
 
 
Coord 2000
16420+7353
Discov num
MLR 198
Comp
Coord arcsec 2000
16 41 57.22 +73 53 14.3
Date first
1971
Date last
2009
Obs
32
Pa first
36
Pa last
69
P.A. Now (θ)
44.2°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.27"
Mag pri
7.30
Mag sec
7.60
delta mag (ΔM)
0.3
Spectral class
A2 (white)
Pri motion ra
-015
Sec motion ra
Pri motion dec
+041
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Draco
SAO
8602
HIP
81757
Tycho2
4426-00098-1
HD
151746
BD
BD+74 680
Distance
107.87
Distance ly
351.87
last precise pa
69.3
last precise sep
0.221
 
 
ORBITAL ELEMENTS
 
 
Period (P)51.16y Periastron (T)1993.69y Semi-major axis (a)0.199a
Eccentricity (e)0.542 Inclination (i)135.3° Longitude of periastron (ω)322.4°
Node (Ω)192.7° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2009
label rho theta
2000 0.127 128.6
2001 0.134 118.8
2002 0.141 110.0
2003 0.150 102.1
2004 0.159 95.1
2005 0.169 88.9
2006 0.179 83.4
2007 0.188 78.5
2008 0.198 74.0
2009 0.207 69.9
2010 0.217 66.2
2011 0.225 62.8
2012 0.234 59.7
2013 0.242 56.7
2014 0.249 54.0
2015 0.256 51.3
2016 0.262 48.9
2017 0.267 46.5
2018 0.272 44.2
2019 0.276 42.0
2020 0.280 39.8
2021 0.282 37.7
2022 0.284 35.6
2023 0.285 33.6
2024 0.285 31.5
2025 0.284 29.5
2026 0.282 27.4
2027 0.280 25.3
2028 0.276 23.1
2029 0.271 20.9
2030 0.265 18.6

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

grafico orbita





grafico misure orbit6
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
16420+7353 MLR 198 1993 29 214 0.1 7.30 7.60 A2 O 164157.22+735314.3
16420+7353 MLR 198 2008 31 74 0.2 7.30 7.60 A2 O 164157.22+735314.3
16420+7353 MLR 198 2009 32 69 0.2 7.30 7.60 A2 O 164157.22+735314.3

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