Tau Leonis (Struve-A 19)

Sketch of Tau Leonis (Struve-A 19 / STFA 19)

Sketch of Tau Leonis / Struve-A 19

Click image to view larger version.

Observation Notes:

I saw this widely spaced, colorful double as Orange-yellow and blue. Despite a G8 primary and G5 secondary, other observers also pick up the blue color contrast in the companion: 33 Doubles - Tau LEO. Sissy Haas sees them as lemon yellow and gray. They make a striking, low-power, double-double with nearby 83 Leonis.

SubjectTau Leonis (84 LEO / Struve-A 19 / STFA 19)
ClassificationDouble Star
Position (J2000)*Leo [RA: 11 27 56.2 / Dec: +02 51 22.6]
Position AngleAB: 185° [My Measurement 2009.9]
AB: 181° [WDS 2004]*
SeparationAB: 90" [My Measurement 2009.9]
AB: 88.9" [WDS 2004]*
Magnitudes*A: 5.1; B: 7.1
Spectral Types*A: G8II-III; B: G5
Date/TimeNOV 27, 2009 - 5:15 AM MST (NOV 27, 2009 - 12:15 UT)
Observing Loc.Flagstaff, AZ - Home
InstrumentOrion SkyQuest XT8 Dobsonian (203 mm dia./1200 mm F/L)
Eyepieces/Mag.Pentax XW10 + 2X Barlow (240X)
Meade Astrometric EP + 2X Barlow (200X)
ConditionsClear, cold, hazy
Seeing3-4/10 Pickering
TransparencyMag 5.5 NELM
*ReferencesThe Washington Visual Double Star Catalog (Mason+ 2001-2009); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD; Double Stars for Small Telescopes - Sissy Haas

The Cerulean Arc

My weblog for
everything else non-astronomy

Pin at will!

(Thanks for maintaining
return links.)

About this Entry

This page contains a single entry by Jeremy Perez published on July 27, 2011 11:56 PM.

83 Leonis (Struve 1540) was the previous entry in this blog.

Tau and 83 Leonis (Struve-A 19 / Struve ) is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.


Monthly Archives

Powered by Movable Type 5.2.3