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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Supernova 2021rhu - 20.8.2021 at 23.37 - 20.8.2021 at 23.58 Orimattila, Artjärvi, Tähtikallio Observation number 101641

Visibility I / V


SN 2021 Rhu Pegasus in the supernova galaxy NGC7814 (little sombrero) was filmed on the first night of the August 2021 extra work. Toni and Veikko described Kari as a measurement sensor. The supernova was discovered by the Zwicky Transient Facility (ZTF) exploration program on Palomar’s Samuel Oschin 48-inch Schmidt telescope on July 1, 2021. The ZTF tracks all changes in the starry sky, supernovae, comets, asteroids, etc. Source ZTF https://www.ztf.caltech.ed The measurement was complicated by the halo in the center of the galaxy, which had to be dimmed considerably in order for the object to be visible. Supernova reference point RA = 00h03m15s.429, Decl. = + 16 ° 08'44 ".51 # 2021rhu"> https://www.rochesterastronomy.org/supernova.html #2021rhu . Supernova development source ALeRCE https://alerce.online/object/ZTF21abiuvdk. ALeRCE is a machine intelligence service based on the new LSST Vera Rubin Observatory and ATLAS and ZTF systems Source ALeRCE http://alerce.science/ . The type of supernova is 1a, it is a white dwarf star that gets material from its partner and grows towards the border of Chandrasekhar (about 1.4 masses of the Sun) when it explodes as a supernova.

1 picture. A total of 1-11 images. There is no supernova in the picture.

2 picture. A total of 1-11 images. Shoots stretched down so that the subject appears.

3Picture. Measured image 1 2021-Aug-20 20: 37: 10.0 2459447.35914JDUT 00h03m15.35s + 16d08'45.0 "13.815mag Std Dev 1881.976 SNR 289.533 FWHM6.511.

4Picture. Measured image 11 2021-Aug-20 20: 58: 01.0 2459447.37362JDUT 00h03m15.31s + 16d08'45.2 "13.868mag Std Dev 1616.698 SNR 291.387 FWHM6.712.

TYC 1178-738-1 12.00mag stars used to calibrate the brightness measurement.Supernova brightness 13,841.



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Additional information
  • Observation target
    • Supernova
  • Designation
    • 2021rhu
  • Constellation
    • Pegasus
  • Brightness in magnitudes
    • 13.841
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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