Astrophotography by Anthony Ayiomamitis

Red Dwarf Krueger 60 A/B

An aspect of astronomy which is very exciting is the handful of stars which have been found to be characterized with very high proper motion. To be more specific, the position of stars is virtually identical from century to century (let alone, year to year!) and, yet, a very small number of these stars show dramatic motion across the sky when observed from year to year. This rapid motion which is easily identified using parallax techniques strongly suggests that these stars are very close to our sun and solar system with distances often being less than ten light years (many galaxies, for example, are hundreds of thousands of light years away). The most dramatic of these stars is Barnard's Star which has a proper motion slightly in excess of ten arc-seconds per year (!), is estimated to be approximately 5.94 light years away and is currently passing through the constellation of Ophiuchus. Other examples of interest include Wolf 359 (4.70" per year, Leo), Lalande 21185 (4.80", UMa) and Lacaille 9352 (6.90", PsA). The most recent discovery (2002) is Teegardner's Star in the constellation of Aries where preliminary estimates suggest a proper motion of 5.05" per year with a distance of approximately eight light years from the sun.

Note: Krueger (or Kruger) 60 A/B is a very interesting binary red dwarf system which lies 13.15 light-years away in the constellation of Cepheus. The two member red dwarfs are separated by an average of 9.95 AU (or 2-3 arc-seconds) and revolve about a common center of mass with a period of 44.6 years. The brighter member of the binary system (Krueger 60 A) has a magnitude of 9.59 and is characterized with a mass of 27.1% and a diameter of 35% that of the sun. The dimmer member, Krueger 60 B, is also a flare star with a magnitude of 11.40 and a mass and diameter of 17.6% and 24%, respectively, that of the sun. Furthermore, Krueger 60 B at 0.18 solar masses is also one of the lightest stars known. Krueger 60 A/B is characterized with a proper motion of 0.989 arc-seconds per year.

Please click on the image below to display in higher resolution (1200 x 950)

Image Details
Red Dwarf Krueger 60 A/B
Imaging Details
Object:
Krueger 60 A/B

Common Name(s):
N/A

Other Designations:
HIP 110893,
GSC 3991:92


Object Classif:
Red Dwarf (M2V)

Constellation:
Cepheus

RA / Dec:
22h 27m 58s /
57 41' 40"


Luminosity:
0.010 x Sun

Mass:
0.271 x Sun

Diameter:
0.35 x Sun

Distance:
13.15 light-yrs

Proper Motion:
0.989" / year

Magnitude:
9.59
Date:
July 21, 2010
02:45 - 05:00 UT+3


Location:
Athens, Greece

Equipment:
AP 160/f7.5 Starfire EDF
AP 1200GTO GEM
SBIG ST-10XME
SBIG CFW10
SBIG LRGB filters


Integrations:
Lum :  030 min (10 x 03 min)
Red :  030 min (05 x 06 min)
Green :  030 min (05 x 06 min)
Blue :  030 min (05 x 06 min)
Binning :  1x1 (Lum),  1x1 (RGB)

Image Scale:
1.17" per pixel

Temperatures:
Ambient : + 24.0 C
CCD Chip : - 10.0 C

Software:
CCDSoft V5.00.195
CCDStack V1.6.0.5
eXcalibrator V1.0.3.0
Aladin V6
Photoshop CS2