Double Stars - Leo

  • Note:

    All images are at 1:1 scale taken with the same equipment (120mm refractor, 1000mm FL, Canon 450D DSLR) and same magnification unless stated. The Canon 450D gives equivilent to a 12mm EP, giving a mangnification factor of approximatly 80x. This means that the split between all stars can be compared against each other. Exposure times and ISO levels are adjusted to give best image of both components but on average they are 4 seconds at ISO 400


  • 00:09 UTC      11-01-2013

    83 Leo

    This double shows slight colour and size difference, the secondary appearing slighty orange. With magnitueds of 6.4 and 7.4 respectively they are both bright objects. Note the size difference between this pair and others, as all images are presented to the same scale.
    Details: Constellation: Leo    RA: 11h 26' 45.7"    Dec: +3° 0' 45.6"    PA: 150º     Separation: 28.5"

  • 20:40 UTC      06-02-2013

    54 Leo

    A nice bright double of magnitude 4.5 and 6.5, but with a separation of just 6" made this not so easy to split. The split can just be seen on the image, however I did return to it later in the evening for a visual and even on a 25mm EP it was clear and easily split.
    Details: Constellation: Leo    RA: 10h 55m 36.7s    Dec: +24° 44' 58.7"    PA: 110º     Separation: 6.5"

  • 22:21 UTC      06-02-2013

    54 Leo (with UHC-S filter)

    The same double of 4.5 and 6.5, but taken using a UHC-S filter. It doesn't seem to do much other than remove any colour, leaving both stars blue.
    Details: Constellation: Leo    RA: 10h 55m 36.7s    Dec: +24° 44' 58.7"    PA: 110º     Separation: 6.5"


  • 20:52 UTC      06-02-2013

    3 Leo

    A wide separation of 25" made the split easy, but due to the difference in magnitude, 5.9 and 10.6, made imaging difficult. A very bright primary and very faint secondary, with the secondary just visible on this 8 second exposure.
    Details: Constellation: Leo    RA: 09h 28m 29.2s    Dec: +08° 11' 17.4"    PA: 80º     Separation: 25.2"

  • 21:07 UTC      06-02-2013

    STF 1442

    An almost even magnitude double at 8 and 8.6 with a 13" separation made this an easy one to split and image. The split was very easy visually too.
    Details: Constellation: Leo    RA: 10h 31m 59.3s    Dec: +22° 02' 9.9"    PA: 155°     Separation: 13.4"



  • 21:18 UTC      06-02-2013

    STF 1582

    Another good double, fairly close mag. at 8.2 and 9.7 with 12" separation was easy to image and split. However, when observed visually later in the evening, it proved to be a difficult target and I could not be sure if I could split it.
    Details: Constellation: Leo    RA: 11h 56m 0.8s    Dec: +21° 58' 54.7"    PA: 76º     Separation: 12.1"


  • 21:23 UTC      06-02-2013

    STF 1360

    Another easy close magnitude pair, 8.3 and 8.6 with a 14" separation made this pair very easy both to image and visually.
    Details: Constellation: Leo    RA: 09h 30m 34.8s    Dec: +10° 35' 59.7"    PA: 243º     Separation: 14.0"