Comet C/2014 Q2 (Lovejoy)

 

2015-01-01

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + Sloan r’ Gen-1 Astrodon filter, CCD@-30°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

64x15s from 21:24UT to 21:55UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020  C2015 01 01.89150 04 57 52.25 -17 15 10.9          10.1 N      K25

    CK14Q020  C2015 01 01.90221 04 57 47.61 -17 13 46.1          10.1 N      K25

    CK14Q020  C2015 01 01.91333 04 57 42.76 -17 12 16.9          10.1 N      K25

Conditions: seeing.jpg. Bright Moon, phase 38°.

2015-01-10

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME +CLR Astrodon filter, CCD@-25°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

Top: 45x15s from 20:55UT to 21:16UT, recentered on comet with Astrometrica.

Mosaic: (45+47)x15s from 20:55UT to 21:16UT and 21:16UT to 21:43UT

NET UCAC-4

    CK14Q020  C2015 01 10.87182 03 55 57.77 +04 42 47.1           9.9 N      K25

    CK14Q020  C2015 01 10.87944 03 55 54.82 +04 43 55.1           9.9 N      K25

    CK14Q020  C2015 01 10.88659 03 55 52.03 +04 44 57.6           9.9 N      K25

Conditions: seeing.jpg, the wind shaked the telescope, 4 to 6’’ FWHM images.

log and DPP with IRIS, slightly cropped

mosaic at full resolution 1.25 ‘’/pixel


(also at scale 1/2, 2.5’’/pixel C2014Q2_zoom0.5.jpg

or at scale 1/3, 3.75’’/pixel C2014Q2_zoom0.333.jpg)

2015-01-12

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME +CLR Astrodon filter, CCD@-25°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

Top: 75x15s from 20:41UT to 21:15UT, recentered on comet with Astrometrica.

Mosaic: (75+82)x15s from 20:41UT to 21:15UT and 21:21UT to 22:00UT

NET UCAC-4

    CK14Q020  C2015 01 12.86197 03 43 29.02 +09 30 25.4           9.9 N      K25

    CK14Q020  C2015 01 12.87335 03 43 24.81 +09 32 01.7          10.0 N      K25

    CK14Q020  C2015 01 12.88557 03 43 20.27 +09 33 44.7          10.0 N      K25

Conditions: seeing.jpg, 4 to 5’’ FWHM images.

mosaic at full resolution 1.25 ‘’/pixel


(also at scale 1/2, 2.5’’/pixel C2014Q2_mosaic_zoom0.5.jpg

or at scale 1/3, 3.75’’/pixel C2014Q2_mosaic_zoom0.333.jpg)

2015-01-17

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME +CLR Astrodon filter, CCD@-30°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

Top: 50x15s from 20:41UT to 21:15UT, recentered on comet with Astrometrica.

Mosaic: (50+50)x15s from 21:15UT to 21:15UT and 21:21UT to 22:00UT

NET UCAC-4

    CK14Q020  C2015 01 17.77260 03 15 33.31 +20 02 09.2           9.9 N      K25

    CK14Q020  C2015 01 17.78308 03 15 29.96 +20 03 22.2           9.9 N      K25

    CK14Q020  C2015 01 17.79380 03 15 26.54 +20 04 36.5           9.9 N      K25

Conditions: SeeingGraph_20150117.png, correct seeing, but strong wind buffeting shaking often too much the telescope, 4 to 6’’ FWHM images.

mosaic at full resolution 1.25 ‘’/pixel


(also at scale 1/2, 2.5’’/pixel C2014Q2_mosaic_zoom0.5.jpg)

2015-01-31

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + SDSS r’ Gen-1 Astrodon filter, CCD@-30°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

40x30s from 19:18UT to 19:47UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020  C2015 01 31.80519 02 18 43.94 +39 02 39.8          10.1 N      K25

    CK14Q020  C2015 01 31.81499 02 18 42.14 +39 03 11.7          10.0 N      K25

    CK14Q020  C2015 01 31.82434 02 18 40.44 +39 03 41.7          10.1 N      K25

Conditions: seeing.jpg, bright Moon, phase 35° (90% illuminated), at 57° from the comet. Very strong gradient in the image, hard to correct for.  I did an average of the 40 sub with Astrometrica, to avoid saturation from a simple ‘add’, but the resulting image has a lower dynamics and the background correction with MaximDL (or IRIS) makes steps in the background. Ideally, the image should be treated as a matrix of float numbers rather than integers, this would have avoided these steps in the corrected image...

2015-02-10

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME +CLR Astrodon filter, CCD@-30°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

20x50s from 20:30UT to 21:00UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020  C2015 02 10.86103 01 54 34.81 +46 23 35.4          10.1 N      K25

    CK14Q020  C2015 02 10.86755 01 54 34.06 +46 23 49.3          10.1 N      K25

    CK14Q020  C2015 02 10.87481 01 54 33.22 +46 24 04.5          10.1 N      K25

Conditions: seeing.jpg.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS + curves in Gimp

2015-02-11

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME +CLR Astrodon filter, CCD@-30°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

29x50s from 18:16UT to 18:52UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020  C2015 02 11.76184 01 52 54.77 +46 55 04.3          10.3 N      K25

    CK14Q020  C2015 02 11.77282 01 52 53.53 +46 55 27.1          10.3 N      K25

    CK14Q020  C2015 02 11.78636 01 52 51.96 +46 55 54.8          10.3 N      K25

Conditions: seeing.jpg.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS + curves in Gimp

2015-06-17

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + CLR Astrodon filter, CCD@-18°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

12x60s from 22:23UT to 22:37UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 06 17.93431 14 45 39.31 +80 29 36.7          13.1 N      K25

    CK14Q020 KC2015 06 17.93760 14 45 39.36 +80 29 30.6          13.1 N      K25

    CK14Q020 KC2015 06 17.94088 14 45 39.12 +80 29 24.2          12.9 N      K25

Conditions: seeing.jpg.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS

2015-06-24

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + Sloan r’ Astrodon Gen-1 filter, CCD@-18°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

20x60s from 22:16UT to 22:39UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 06 24.93054 14 45 39.78 +76 53 01.5          13.1 N      K25

    CK14Q020 KC2015 06 24.93630 14 45 39.94 +76 52 50.7          13.1 N      K25

    CK14Q020 KC2015 06 24.94165 14 45 39.98 +76 52 40.8          13.1 N      K25

Anti-tail 25 arcmin long in PA=309°.

Conditions: seeing.jpg.  Moon first quarter.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS

2015-06-26

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + Sloan r’ Astrodon Gen-1 filter, CCD@-18°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

20x60s from 21:24UT to 21:47UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 06 26.89444 14 46 17.30 +75 51 48.0          13.2 N      K25

    CK14Q020 KC2015 06 26.90020 14 46 17.37 +75 51 37.1          13.3 N      K25

    CK14Q020 KC2015 06 26.90555 14 46 17.45 +75 51 26.7          13.2 N      K25

Anti-tail 30 arcmin long in PA=309°.

Conditions: seeing.jpg.  Moon phase 62°.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS

2015-07-06

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + Astrodon CLR filter, CCD@-11°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

30x60s from 21:31UT to 22:08UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 07 06.90084 14 51 38.33 +70 38 48.7          13.3 N      K25

    CK14Q020 KC2015 07 06.90909 14 51 38.67 +70 38 33.4          13.3 N      K25

    CK14Q020 KC2015 07 06.91795 14 51 39.04 +70 38 16.6          13.4 N      K25

Anti-tail 20 arcmin long in PA=312°.

Conditions: seeing.jpg.   Good seeing, some haze after daytime temperature reaching 36.5°C, and about 23°C during the imaging session.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS

2015-07-17

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + Sloan r’ Astrodon Gen-1 filter, CCD@-11°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

21x60s from 21:44UT to 22:09UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 07 17.90842 14 59 54.83 +64 56 51.8          13.6 N      K25

    CK14Q020 KC2015 07 17.91420 14 59 55.09 +64 56 40.8          13.6 N      K25

    CK14Q020 KC2015 07 17.91998 14 59 55.39 +64 56 30.4          13.6 N      K25

Anti-tail 20 arcmin long in PA=318°.  Hint of a broad tail >20 arcmin long in PA=112°.

Conditions: seeing.jpg.  Some extinction from summer haze.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS

2015-09-07

TEL 0.205-m f/5.5 reflector + CCD SBIG ST10XME + CLR Astrodon filter, CCD@-18°C.

f=1125mm, field 45.4‘x30.6’, 1.25’’/pixel, white circle diameter = 300 pixels = 374’’.

North up, East left. Aperture radius in Astrometrica = 5 pixels = 6.25’’.

12x80s from 19:28UT to 19:48UT, recentered on comet with Astrometrica.

NET UCAC-4

    CK14Q020 KC2015 09 07.81347 15 50 39.76 +41 26 50.9          14.7 N      K25

    CK14Q020 KC2015 09 07.81769 15 50 40.00 +41 26 45.1          14.7 N      K25

    CK14Q020 KC2015 09 07.82192 15 50 40.30 +41 26 39.5          14.7 N      K25

Tail >15 arcmin long in PA=339°.

Conditions: seeing.jpg.

image with Astrometrica

image with Astrometrica + log & DPP in IRIS