Astrophotography by Anthony Ayiomamitis

Red Dwarfs LFT 1431/2

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: The binary pair dwarf pair LFT 1431/2 (aka Struve 2398) lie at a distance of 11.52 light-years away and orbit each other every 408 years.

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

Image Details
Red Dwarfs LFT 1431/2
Imaging Details
Object:
LFT 1431/2

Common Name(s):
Struve 2398

Other Designations:
HIP 91768 / 91772

Object Classif:
K-class main seq

Constellation:
Draco

RA / Dec:
18h 42m 45s /
59 38' 08"/37' 56"


Luminosity:
0.039 / 0.021 x Sun

Mass:
0.36 / 0.30 x Jup

Diameter:
0.55 / 0.54 x Jup

Distance:
11.52 light-yrs

Proper Motion:
N/A

Magnitude:
8.94 / 9.69
Date:
June 12, 2010
02:00 - 04:05 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 : + 26.2 C
CCD Chip : - 12.5 C

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