Double Stars Observing Project

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Observations of Double Stars by 90 Millimeter Observatory

The purpose of the Astronomical League Double Star Program is to introduce observers to 100 of the finest double and multiple stars in the heavens. You don’t need a large, expensive telescope to view the objects on this list. All objects on this list were originally observed with a three-inch refractor using between 75X and 150X. To learn more visit Astronomical League Double Star Observing Program.

 

Statistics

Object type Fraction of objects Number of objects Fraction of observations Number of observations
Double Stars 100 % 13 of 13 100 % 14 of 14

Observations at a glance

Details Object Type Constellation Time Site Optics Aperture [mm] Rating Finding
–> STF 2417 DS Ser 2015/08/16 21:11 UT-05:00h SGL 43 French Creek Gun Range 90mm APO 90.0 1 Binary can be resolved
–> STF 2010 DS Her 2013/09/13 22:09 UT-05:00h SGL 43 French Creek Gun Range 120mm 120.0 1 Binary can be resolved
–> STF 2758 DS Cyg 2013/09/08 22:59 UT-05:00h 90 Millimeter Observatory 90mm APO 90.0 1 Binary can be resolved
–> 31CYG DS Cyg 2013/09/08 22:48 UT-05:00h 90 Millimeter Observatory 90mm APO 90.0 1 Binary can be resolved
–> STF 43 DS Cyg 2013/09/08 22:34 UT-05:00h 90 Millimeter Observatory 90mm APO 90.0 1 Binary can be resolved
–> STF 2264 DS Her 2013/09/08 22:11 UT-05:00h 90 Millimeter Observatory 90mm APO 90.0 1 Binary can be resolved
–> ETACAS DS Cas 2013/09/08 21:37 UT-05:00h 90 Millimeter Observatory 90mm APO 90.0 1 Binary can be resolved
–> BETA LYR DS Lyr 2013/09/03 23:55 UT-05:00h SGL 43 French Creek Gun Range 120mm 120.0 1 Binary can be resolved
–> BU 968 DS Lyr 2013/09/03 23:04 UT-05:00h SGL 43 French Creek Gun Range 120mm 120.0 1 Binary can be resolved
–> STF 2382 DS Lyr 2013/09/03 22:49 UT-05:00h SGL 43 French Creek Gun Range 120mm 120.0 1 Binary can be resolved
–> STF 2727 DS Del 2013/09/03 00:08 UT-05:00h SGL 43 French Creek Gun Range 120mm 120.0 1 Binary can be resolved
–> STF 1664 DS Vir 2013/05/04 23:45 UT-05:00h SGL 110 State Game Lands 120mm 120.0 1 Binary can be resolved
–> STF 2758 DS Cyg 2012/08/16 22:05 UT-05:00h Stefan Observatory 152mm 152.0 1 Binary can be resolved
–> STF 1692 DS CVn 2012/03/11 22:46 UT-05:00h 90 Millimeter Observatory 90mm 90.0 1 Binary can be resolved

Observations

Object STF 2417 (Double star)
Site SGL 43 French Creek Gun Range
Time 2015-08-16 at 21:11:00-05:00
Faintest star 6.0 mag
Seeing 3 (moderate)
Optics 90mm APO
Eyepiece EF 27mm (M=23.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Cluster has a nice surrounding
  • Color of main star:
    white
  • Color of companion:
    white
  • Two almost equal magnitude star. Well seperated.


Object STF 2010 (Double star)
Site SGL 43 French Creek Gun Range
Time 2013-09-13 at 22:09:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories #64 on AL double star observing list
Eyepiece Celestron XL 12mm (M=83.3)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Cluster has a nice surrounding
  • Color of main star:
    yellow
  • Color of companion:
    white
  • Primary color is yellow/white and the secondary color is white.


Object STF 2758 (Double star)
Site 90 Millimeter Observatory
Time 2013-09-08 at 22:59:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm APO
Eyepiece EF 27mm (M=23.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Cluster has a nice surrounding
  • Color of main star:
    yellow
  • Color of companion:
    yellow
  • Pair of yellow / gold suns set in a nice field of stars.


Object 31CYG (Double star)
Site 90 Millimeter Observatory
Time 2013-09-08 at 22:48:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm APO
Accessories Triple star
Eyepiece EF 27mm (M=23.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Color of main star:
    yellow
  • Color of companion:
    blue
  • This is really a triple star system with the third componet at 323 degrees sep= 337″. the C componet appears blue/white.


Object STF 43 (Double star)
Site 90 Millimeter Observatory
Time 2013-09-08 at 22:34:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm APO
Accessories Albario
Eyepiece EF 27mm (M=23.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Color of main star:
    yellow
  • Color of companion:
    blue
  • One of the showpieces of the summer sky.


Object STF 2264 (Double star)
Site 90 Millimeter Observatory
Time 2013-09-08 at 22:11:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm APO
Eyepiece TMB 9mm (M=69.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • No difference of brightness
  • Color of main star:
    white
  • Color of companion:
    white
  • The pair is nearly equal in magnitude and required 69x to resolve. Both stars appear white.


Object ETACAS (Double star)
Site 90 Millimeter Observatory
Time 2013-09-08 at 21:37:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm APO
Eyepiece Celestron XL 12mm (M=51.8)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Color of main star:
    white
  • Color of companion:
    red
  • The pair is well seperated at 52x. The primary is brillanr white while the secondary appears ruddy to readish the longer I look at it.


Object BETA LYR (Double star)
Site SGL 43 French Creek Gun Range
Time 2013-09-03 at 23:55:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories #85 on the AL Double Star List.
Eyepiece EF 27mm (M=37.0)
Session (se_300204)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Cluster has a nice surrounding
  • Color of main star:
    white
  • Color of companion:
    blue
  • Beta Lyr is in a fairly rich star field. The primary color is blue/white and the secondary is blue.


Object BU 968 (Double star)
Site SGL 43 French Creek Gun Range
Time 2013-09-03 at 23:04:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories #80 on the AL Double Star List.
Eyepiece EF 27mm (M=37.0)
Session (se_300204)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Cluster has a nice surrounding
  • This is an easy split at 37x. The double star lies in a FOV containing many faint stars. There is a loose grouping on the north edge of the FOV that keeps grabbing my attention.


Object STF 2382 (Double star)
Site SGL 43 French Creek Gun Range
Time 2013-09-03 at 22:49:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories #79 on AL Double Star list.
Eyepiece Radian 6mm (M=166.7)
Session (se_300204)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Color of main star:
    white
  • Color of companion:
    white
  • The A?B componet very easy to split at 37x but the A?C – B?D componets requires 167x. This is not my first attempt to split the double-double but it is the first time I was able to split all four stars.


Object STF 2727 (Double star)
Site SGL 43 French Creek Gun Range
Time 2013-09-03 at 00:08:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories #90 on the AL Double Star List.
Eyepiece Celestron XL 12mm (M=83.3)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • Color of main star:
    yellow
  • Color of companion:
    yellow
  • Nice golden yellow pair.


Object STF 1664 (Double star)
Site SGL 110 State Game Lands
Time 2013-05-04 at 23:45:00-05:00
Faintest star 6.0 mag
SQM reading: 20.89 mags/sq.arcsec
Seeing 1 (very good)
Optics 120mm
Accessories Points to M104
Eyepiece Radian 14mm (M=71.4)
Session (se_300212)

Visual impression

  • Rating:
    Binary can be resolved
  • Cluster has a nice surrounding
  • This multible star is easy at 37x but I wanted to take M104 out of the FOV so I dropped in the 14mm for a closer look.


Object STF 2758 (Double star)
Site Stefan Observatory
Time 2012-08-16 at 22:05:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 152mm
Eyepiece 20mm (M=49.4)
Session (se_300190)

Visual impression

  • Rating:
    Binary can be resolved
  • Appears stellar
  • No difference of brightness
  • Cluster has a nice surrounding
  • Color of main star:
    yellow
  • Color of companion:
    yellow
  • Nice pair of equal magnitude golden suns.


Object STF 1692 (Double star)
Site 90 Millimeter Observatory
Time 2012-03-11 at 22:46:00-05:00
Faintest star 4.5 mag
Seeing 3 (moderate)
Optics 90mm
Eyepiece Hyperion 10mm (M=91.0)

Visual impression

  • Rating:
    Binary can be resolved
  • Color of main star:
    white
  • Color of companion:
    blue
  • Just one of my favorite double stars.


Master data


Session (se_300190)
Site: Stefan Observatory
Begin: 2012-08-16 at 20:36:00-05:00
End: 2012-08-17 at 00:30:00-05:00
Weather: 78 degrees and very humid. You can see the moisture in the surrounding sky glow.
Equipment: 152mm refractor and various EP’s.
Comments: Stefan’s driveway. Stefan is a good friend who has invited me to observe with him at his home.


Session (se_300212)
Site: SGL 110 State Game Lands
Begin: 2013-05-04 at 20:30:00-05:00
End: 2013-05-05 at 02:00:00-05:00
Weather: It’s cool temp wise at this site and I was lucky enough to have a light jacket in the car. The sky is clear and steady.
Equipment: Orion 120mm f/8.3 refractor and the 90mm Megrez APO refractor.
Comments: This is my first trip to SGL 110 – State Game Lands. The Chesmont Astronomical Society calls this DS-2. It’s about a mile and a half on the dark side of route 182. Observing with me tonight is my friend Karl Krasley, his daugther Jill and her friend Scott. I should call this night “Observing with the Krasley’s”.


Session (se_300204)
Site: SGL 43 French Creek Gun Range
Begin: 2013-09-03 at 21:30:00-05:00
End: 2013-09-04 at 01:30:00-05:00
Weather: Weather conditions were just right for this night. A light cool breeze coming out of the north-east, no clouds with very transparenrt skies.
Equipment: Orion AstroView 120mm Refractor 1000mm f/8.3.
Various eyepieces.
Comments: It has been several week since the skies were clear and the weather favroable for observing. I wanted to get in some time under dark skies so I went to the state Game Land (SGL) at French Creek State Park with a few of the Chesmont and DVAA club members to try and observe some of the fainter deep sky objects.

Object: 31CYG (Double star
in Cyg)
RA: 20h 13.6m
Dec: 46° 44.1′
m(vis): 3.8 mag
Registered by: Daniel Acker
57 AQL

Object: BETA LYR (Double star
in Lyr)
Alias names: ADS11745, BETALYR

 

RA: 18h 50.01m
Dec: 33° 24′
m(vis): 3.5 mag
BETA LYR
AB: 3.5mag / 7mag; 47″ (PA=149°)

Object: BU 968 (Double star
in Lyr)
Alias names: ADS11639, BU968, ZETALYR1

 

RA: 18h 44.7m
Dec: 37° 36.1′
m(vis): 4.3 mag
Registered by: Daniel Acker
ZETA LYR 1
AE: 4.3mag / 11.5mag; 61.8″ (PA=301°)
#80 on the AL Double Star List.

Object: ETACAS (Double star
in Cas)
Alias names: ADS671, STF60

 

RA: 0h 48.81m
Dec: 57° 49.1′
m(vis): 3.6 mag
Registered by: Daniel Acker
ETA CAS
AC: 3.6mag / 11.4mag; 158.9″ (PA=238°)
AD: 3.6mag / 11.6mag; 159.6″ (PA=30°)
AE: 3.6mag / 9mag; 190.6″ (PA=120°)
AG: 3.6mag / 8.9mag; 339.2″ (PA=243°)
BH: 7.2mag / 8.6mag; 648″ (PA=2°)

Object: STF 1664 (Double star
in Vir)
Alias names: STF1664

 

RA: 12h 38.31m
Dec: -11° 31′
m(vis): 8.1 mag
AB: 8.1mag / 9.3mag; 26.3″ (PA=237°)
AC: 8.2mag / 11.5mag; 62.5″ (PA=306°)

Object: STF 1692 (Double star
in CVn)
Alias names: ADS8706, ALPHACVN, STF1692

 

RA: 12h 56.1m
Dec: 38° 18′
m(vis): 2.9 mag
ALPHA CVN

Object: STF 2010 (Double star
in Her)
Alias names: ADS9933, KAPPAHER, STF2010

 

RA: 16h 08.1m
Dec: 17° 03.1′
m(vis): 5.3 mag
Registered by: Daniel Acker
KAPPA HER
AB: 5.3mag / 6.5mag; 28.1″ (PA=12°)
This double star is # 64 on the AL obvseving list.

Object: STF 2264 (Double star
in Her)
Alias names: 95HER, ADS10993, STF2264

 

RA: 18h 01.51m
Dec: 21° 35′
m(vis): 5.1 mag
95 HER

Object: STF 2382 (Double star
in Lyr)
Alias names: EPSLNLYR1, STF2382

 

RA: 18h 44.31m
Dec: 39° 40.1′
m(vis): 5.1 mag
Registered by: Daniel Acker
EPSLN LYR 1
AB: 5.1mag / 6.1mag; 2.6″ (PA=356°)
#79 on the AL Double Star Observing List.

Object: STF 2417 (Double star
in Ser)
Alias names: ADS11853, STF2417, THETASER1

 

RA: 18h 56.2m
Dec: 4° 11′
m(vis): 4.5 mag
THETA SER 1
AB: 4.5mag / 5.4mag; 22.3″ (PA=104°)
BC: 4.6mag / 7.9mag; 414.1″ (PA=56°)

Object: STF 2727 (Double star
in Del)
Alias names: ADS14279, GAMMADEL, STF2727

 

RA: 20h 46.6m
Dec: 16° 08.1′
m(vis): 4.5 mag
Registered by: Daniel Acker
GAMMA DEL
#90 on the AL Double Star List.

Object: STF 2758 (Double star
in Cyg)
Alias names: 61CYG, ADS14636, STF2758

 

RA: 21h 06.31m
Dec: 38° 39.1′
m(vis): 5.6 mag
61 CYG
AB: 5.6mag / 6.3mag; 29.5″ (PA=147°)
AD: 5.7mag / 8.6mag; 304.9″ (PA=282°)
AE: 5.7mag / 8.1mag; 306″ (PA=12°)
AP: 5.6mag / 10.5mag; 140.6″ (PA=30°)

Object: STF 43 (Double star
in Cyg)
Alias names: ADS12540, BETACYG, STF43

 

RA: 19h 30.71m
Dec: 27° 57.1′
m(vis): 3.1 mag
BETA CYG
APxB: 3.1mag / 5.4mag; 34.4″ (PA=54°)

Observer: Daniel Acker

Offset for naked eye faintest star estimation, relative to OAL standard correlation:: -0.05 mag

Contact info:

  • dacker11@verizon.net

Site: 90 Millimeter Observatory
Longitude (positive east of Greenwich): -75.380000°
Latitude: 40.270000°
Time zone: UT-300 min

Site: SGL 110 State Game Lands
Longitude (positive east of Greenwich): -76.145000°
Latitude: 40.551000°
Time zone: UT-300 min

Site: SGL 43 French Creek Gun Range
Longitude (positive east of Greenwich): -75.480000°
Latitude: 40.100000°
Time zone: UT-300 min

Site: Stefan Observatory
Longitude (positive east of Greenwich): -75.000000°
Latitude: 40.000000°
Time zone: UT-300 min

Optics: 120mm
Type: R
Vendor: Orion
Aperture: 120.0 mm
Focal length: 1000.0 mm
Light grasp (efficiency): 0.9600

Optics: 152mm
Type: R
Vendor: Explore Scientific
Aperture: 152.0 mm
Focal length: 988.0 mm
Light grasp (efficiency): 0.9800

Optics: 90mm
Type: R
Vendor: Orion
Aperture: 90.0 mm
Focal length: 910.0 mm
Light grasp (efficiency): 0.9600

Optics: 90mm APO
Type: R
Vendor: Williams Optics
Aperture: 90.0 mm
Focal length: 621.0 mm
Light grasp (efficiency): 0.9600

Eyepiece: Hyperion 10mm
Vendor: Baader Planetarium
Focal length: 10.0 mm
Apparent field of view: 68.0°

Eyepiece: Celestron XL 12mm
Vendor: Celestron XL
Focal length: 12.0 mm
Apparent field of view: 60.0°

Eyepiece: Radian 14mm
Vendor: Tele Vue
Focal length: 14.0 mm
Apparent field of view: 60.0°

Eyepiece: 20mm
Vendor: Meade
Focal length: 20.0 mm
Apparent field of view: 68.0°

Eyepiece: EF 27mm
Vendor: Smart Astronomy
Focal length: 27.0 mm
Apparent field of view: 53.0°

Eyepiece: Radian 6mm
Vendor: Tele Vue
Focal length: 6.0 mm
Apparent field of view: 60.0°

Eyepiece: TMB 9mm
Vendor: TMB
Focal length: 9.0 mm
Apparent field of view: 58.0°

//

 

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