C/2023 A3 ( Tsuchinshan-ATLAS )

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Updated on December 22, 2025

Profile Discovery Date January 9 and February 22, 2023 Magnitude 18.7 mag, 18.0 mag Discoverer Purple Mountain Observatory's XuYi Station, Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program Pictures

Orbital Elements Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2024 Sept. 27.75385 TT Pike q 0.3915872 (2000.0) P Q z -0.0003813 Peri. 308.53212 +0.36152122 +0.90068507 +/-0.0000001 Node 21.59947 +0.91855102 -0.29974027 e 1.0001493 Incl. 139.10944 -0.15989507 +0.31451895 From 8555 observations 2022 Apr. 9-2025 Nov. 20, mean residual 0".9.

Finding Charts

Magnitudes Graph m1 = -17.0 + 5 log d + 35 log r [ ,-575] ( - 2023 Mar. 2) m1 = 4.5 + 5 log d + 10.0 log r [-575,-247] (2023 Mar. 2 - 2024 Jan. 24) m1 = 6.0 + 5 log d + 7.5 log r [-247, 0] (2024 Jan. 24 - 2024 Sept.27) m1 = 23.5 + 5 log d + 60 log r(t - 9) [ 0, 19] (2024 Sept.27 - 2024 Oct. 16) m1 = 6.0 + 5 log d + 7.5 log r [ 19, 130] (2024 Oct. 16 - 2025 Feb. 4) m1 = 3.0 + 5 log d + 15.0 log r [ 130, ] (2025 Feb. 4 - )

The orbital elements are published on M.P.E.C. 2025-Y51. The charts are made with StellaNavigator Ver.11 (AstroArts). The magnitudes graphs are made with Comet for Windows.