C/2023 H5 (Lemmon)

Type: Hyperbolic Perihelion date: 30 June 2025 Perihelion distance (q): 4.3 Aphelion distance (Q) : n/a Period (years): n/a Eccentricity (e): 1.0 Inclination (i): 97.9 JPL orbit diagram COBS lightcurve Atlas A possible NEO candidate of 20th magnitude was discovered on 19 April 2023 in images taken with the 1.5-m reflector of the Mt Lemmon Survey. It was placed on the PCCP as C94R802, before the three comets subsequently designated as 2023 H2 to H4. Martin Tichy reported that it had cometary features in follow-up images taken on 21 April. There were pre-discovery PanSTARRS images from between 1 December 2022 and 27 March 2023, and Mt Lemmon images from 28 January 2023. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 29-Dec-24 17.3 0.4 09-Jan-25 17.1 0.4 23-Jan-25 16.9 0.4 04-Feb-25 17.0 0.4 19-Feb-25 16.3 0.4 26-Feb-25 16.3 0.4 07-Mar-25 16.2 0.4 20-Mar-25 16.4 0.4 04-Apr-25 16.4 0.4 16-Apr-25 16.8 0.4 24-Apr-25 16.8 0.4