Month: February 2021

Optical part of gravitational lens system, QSO 0957+561

cepheids

QSO 0957+561 is first discovered gravitational lens system by Walsh, Carswell, & Weymann in 1979. The quasar QSO 0957+561 appears twin (QSO 0957+561A and QSO 0957+561B) due to gravitational lensing by host galaxy YGKOW G1 that is located directly between Earth and the quasar. The expected distance of QSO 0957+561 from earth is around 9.0 billion Ly.

The photometric analysis of such lensed quasars a like QSO 0957+561 are studied to estimate the more accurate value of Hubble constant. Two images are photometrically examined for long time to estimate the time delay which is proportional to difference between distances travelled by to twin counterparts and mass lens model (which depends on host galaxy). The time delay approach is independent of both methods, like plank ΛCDM (Lambda cold dark matter) or Lambda-CDM model flat results and distance ladder + Type Ia SNe results, which are previously used to estimate Hubble constant (for more watch video link added below).

For more reading:

https://wwwmpa.mpa-garching.mpg.de/~komatsu/meetings/ds2013/schedule/suyu_desitterii.pdf

https://iopscience.iop.org/article/10.1086/320462/pdf

We imaged the QSO 0957+561A and QSO 0957+561B. An astrometric reduction of two optical centers of twin quasars in FITS image estimates the separation of 6 arc second due to gravitational lensing by host galaxy. We used photometric R band filter as expecting that redder part of optical spectrum should be more dominated due to high redshift z=1.4.

Instrument:
Catalog: SIMBAD
Bessell (B): +*.*, Bessell (V): +*.*
Bessell (R): +16.4, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear.
End

Cosmology with Time Delay Strong Lensing by Kenneth Wong

https://www.youtube.com/watch?v=YECujbmyTMo

R/I Photometry: S5 0716+714

cepheids

Image:
Object: S5 0716+714/8C 0716+714 — BL Lac
DATE-OBS: 2021-02-19T16:59:54.7152
EXPTIME: 3600.00 (seconds)
SUBFRMS: 60
OBJCTRA: 07 21 55.576
OBJCTDEC: +71 20 36.22
Instrument:
Catalog: SIMBAD
Bessell (B): +15.5, Bessell (V): +14.17
Bessell (R): +14.27, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear. The S5 0716+714 seems brighten about +1.0 mag at R band.
End

https://www.youtube.com/watch?v=5zwQmz9-1TU

Comet 409P/LONEOS-Hill

cepheids

Image:
Object: Comet 409P/LONEOS-Hill
DATE-OBS: 2021-02-17T22:11:27
EXPTIME: 3000.00 (seconds)
SUBFRMS: 25
OBJCTRA: 13 05 29.257
OBJCTDEC: +08 54 09.190
Instrument:
Catalog: UCAC4
Bessell (B): +*.*, Bessell (V): +*.*
Bessell (R): +15.7, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear.
End

Photometry: HAT-P-30b

cepheids

Exo-Planet, Class confirmed:
HAT-P-30b
Imaged/Calibration/Image solve:
PRiSM v11
Photometry and Data Fitting:
HOPS 3.0/Platform: Python 3.7.6
Instrument:
CCD: ATIK-383L+ mono
FILTERS: R
TELESCOPE: C11, 1623.0mm
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear
End

Comet C/2021 A1 (Leonard)

cepheids

Image:
Object: Comet C/2021 A1 (Leonard)
DATE-OBS: 2021-02-12T23:17:45
EXPTIME: 2250.00 (seconds)
SUBFRMS: 50
OBJCTRA: 14 01 27.281
OBJCTDEC: +49 38 36.060
Instrument:
Catalog: UCAC4
Bessell (B): +*.*, Bessell (V): +*.*
Bessell (R): +18.3, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear. As per, Prof. Seiichi Yoshida comet@aerith.net, it may attend mag around +4.0 and go visible to eyes in mid of Dec-2021
End

COMET C/2021 A4 (NEOWISE)

cepheids

Image:
Object: Comet C/2021 A4 (NEOWISE)
DATE-OBS: 2021-02-10T14:41:31
EXPTIME: 990.00 (seconds)
SUBFRMS: 22
OBJCTRA: 07 29 52.575
OBJCTDEC: +65 13 20.642
Instrument:
Catalog: UCAC4
Bessell (B): +*.*, Bessell (V): +*.*
Bessell (R): +14.9, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear
End

Comet C/2021 A2

cepheids

Image:
Object: Comet C/2021 A2
DATE-OBS: 2021-02-05T15:34:36
EXPTIME: 855.00 (seconds)
SUBFRMS: 20
OBJCTRA: 07 08 29.439
OBJCTDEC: -04 06 49.090
Instrument:
Catalog: UCAC4
Bessell (B): +*.*, Bessell (V): +*.*
Bessell (R): +14.2, Bessell (I): +*.*
CCD: ATIK-383L+
FILTERS: R
TELESCOPE: C11, 1623.0mm
PRiSMv10, Astrometrica
Site:
ORIGIN: Cepheid Observatory, India, Vorion Scientific, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
V.K.Agnihotri, B. Kumar, S. Mahawar, K.Vora
Remark:
Sky Clear
End

Spectrum: Comet ISON

cepheids

The spectrum below of the comet ISON shows how easy it is for amateurs to study astronomical spectra. This wonderful spectrum of ISON using a just an 80 mm refractor, simple Star Analyser grating, and a DSLR. It clearly shows the green glow from glowing Carbon (the so-called “Swan bands” – Wikipedia link) This image was captured from a rooftop in Rajasthan, and then processed in the RSpec software.