On December 30, 2018, Beijing time, the Corona Boreal Observatory Supernova Search Program (CSNS), which we cooperated with the Near-Earth Object Telescope of the Purple Mountain Observatory of the Chinese Academy of Sciences, discovered a supernova candidate with a brightness of 17.0 in the sky survey data on the evening of the 29th.

, located in the constellation Cetus, was immediately reported to TNS and received the temporary number "AT 2018 lcd".

On the evening of the 30th, we remotely used Australia's iTelescope's 50-centimeter CDK telescope to photograph the target and obtained clearer photos. At this point, we can determine that the target is a new celestial body and only need to wait for the spectrum to confirm its type.

On the evening of the 31st, the Lijiang Observatory of the Yunnan Observatory of the Chinese Academy of Sciences used a 2.4-meter aperture telescope to take spectral photos of the target. The results showed that it was a young Type II supernova. The observation results were immediately reported to TNS and ATEL, and the supernova received an official number.

"SN 2018 lcd".

That night, we used CSNS to observe the supernova again, and the target brightness had increased to magnitude 16.6.

At this point, the discovery and certification work of the supernova "SN 2018 LCD" has been completed.

The discovery of this supernova not only belongs to the Northern Corona Observatory, but also the result of the joint efforts of every member of our team.

At the same time, we would also like to thank the Near-Earth Object Telescope Group of the Purple Mountain Observatory of the Chinese Academy of Sciences and Teacher Zhang Jujia of the Yunnan Observatory for their dedication and efforts.

The discovery of this supernova is part of one of the Northern Coronary Observatory's wide-area sky survey projects: the Supernova Survey.

In addition, the current wide-area sky survey program also includes the "Comet Survey" and the "Near-Earth Small Object Survey". These three programs have achieved excellent results. Let's take a detailed look at the specific contents.

Corona Borealis Observatory Sky Survey Project 1: "Supernova" Survey The Corona Borealis Observatory Supernova Search (CSNS) was launched in June 2018. It is the first survey plan of the Corona Borealis Observatory to search for new celestial bodies.

In September of the same year, CSNS cooperated with the Near-Earth Object Telescope Group of the Purple Mountain Observatory of the Chinese Academy of Sciences to realize automated processing of observation data.

Currently, CSNS uses Takahashi Mewlon-300CRS as the main observation telescope, with an optical aperture of 300 mm and a focal ratio of f/7.2. The CCD uses a QSI-683 (KAF-8300) camera.

The field of view of a single photo of this combination is 28.58 arc minutes x 21.52 arc minutes, and the Bin2 resolution is 1.03 arc seconds per pixel.

After testing, on a moonless night with good weather, when a Bin2 (Clear) single exposure is performed for 40 seconds, the ultimate magnitude can reach about 19th magnitude, making it easy to identify supernova candidates brighter than 18th magnitude.

In 2020, the Northern Coronary Observatory upgraded the equatorial mount of this telescope. It is currently using a 10 Micron GM2000 HPS low-temperature version of the equatorial mount, which is equipped with a UBVRI photometric filter, which can perform photometric observations on some special targets.

So far, there have been three papers based on observational data from this telescope.

Corona Boreal Observatory Survey Project 2: "Comet" Survey JIST [Jiama'erdeng Tianwentai/ICQ Search and Tracking Program (JIS+T)] project Jiama 'erdeng Tianwentai / ICQ Search and Tracking Project is a comet observation project, which was launched in 2019

In 2017, the main observation content is divided into three aspects: 1. Discovery and search for new comets; 2. Observation and regular survey of known comets through CCD imaging system; 3. Targeting comets to be confirmed on the MPC PCCP page

Track and observe the target and confirm it.

Observations will be published in the regularly published CBET newsletter.

We use every clear night to conduct JIST project observations using the Takahashi Mewlon300 and Alluna RC20 telescopes located in Jiamaerdeng Tianwentai, Ali, Tibet, China.

From 2019 to 2021, the observation project is called the Beimiantianwentai/ICQ Search and Tracking Program (BIST/BIS+T).