C/2025 K1 ( ATLAS )

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Updated on January 24, 2026

Profile Discovery Date May 24, 2025 Magnitude 18.6 mag Discoverer Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program Pictures

Orbital Elements C/2025 K1 (ATLAS) Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2025 Oct. 8.44036 TT Alexandersen q 0.3342189 (2000.0) P Q z -0.0008012 Peri. 271.02395 -0.84164809 -0.11650488 +/-0.0000003 Node 97.55783 +0.12564069 +0.90741120 e 1.0002678 Incl. 147.86402 -0.52520750 +0.40377162 From 2734 observations 2025 Apr. 8-Dec. 19, mean residual 1".1. C/2025 K1-B (ATLAS) Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2025 Oct. 8.45230 TT Pike q 0.3357663 (2000.0) P Q z -0.0059604 Peri. 271.32433 -0.84260253 -0.11349983 +/-0.0001538 Node 97.63973 +0.12892377 +0.90660062 e 1.0020013 Incl. 147.91651 -0.52287631 +0.40643955 From 399 observations 2025 Nov. 5-2026 Jan. 6, mean residual 0".8. C/2025 K1-C (ATLAS) Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2025 Oct. 8.43905 TT Pike q 0.3336711 (2000.0) P Q z +0.0006185 Peri. 270.92270 -0.84132641 -0.11750730 +/-0.0000633 Node 97.52971 +0.12453830 +0.90768286 e 0.9997936 Incl. 147.84651 -0.52598487 +0.40286954 From 1253 observations 2025 Nov. 14-2026 Jan. 5, mean residual 0".6. C/2025 K1-D (ATLAS) Epoch 2025 Oct. 12.0 TT = JDT 2460960.5 T 2025 Oct. 8.49417 TT Pike q 0.3421640 (2000.0) P Q z -0.0253184 Peri. 272.53735 -0.84624443 -0.10128090 +/-0.0082156 Node 97.96947 +0.14220996 +0.90321091 e 1.0086630 Incl. 148.11737 -0.51346537 +0.41707581 From 142 observations 2025 Nov. 26-30, mean residual 0".3.

Finding Charts

Magnitudes Graph m1 = 11.7 + 5 log d + 10.0 log r

The orbital elements are published on M.P.E.C. 2026-A90. The orbital elements of the component B and C are published on M.P.E.C. 2026-A24. The orbital elements of the component D are published on M.P.E.C. 2026-A17. The charts are made with StellaNavigator Ver.11 (AstroArts). The magnitudes graphs are made with Comet for Windows.