| Name: Nambram Niroda Devi |
| Affiliation: DEPARTMENT OF PHYSICS , ASSAM UNIVERSITY SILCHAR |
| Conference ID: ASI2026_635 |
| Title: Imaging Polarimetry of Comets C/2023 H5 (Lemmon) and 333P/LINEAR |
| Abstract Type: Poster |
| Abstract Category: Sun, Solar System, Exoplanets, and Astrobiology |
| Author(s) and Co-Author(s) with Affiliation: Nambram Niroda Devi(Assam University, Silchar-788011, India), Himadri Sekhar Das(Assam University, Silchar-788011, India) |
| Abstract: We report the first R-band (λ = 0.630 μm, Δλ = 0.120 μm) photopolarimetric observations of comet C/2023 H5 (Lemmon) at low phase angles (9.9°–10.4°) and comet 333P/LINEAR at a high phase angle (62°) using AIMPOL on the 1.04m Sampurnanand Telescope. C/2023 H5 shows shallow intensity slopes (−0.19 to −0.08) and negative polarization (−1.5% to −2.7%), consistent with coherent backscattering, while 333P/LINEAR shows comparatively steeper nuclear slopes (−0.41) and positive polarization up to ∼16%. The 62° observation of 333P/LINEAR is the highest R-band phase angle recorded for cometary polarimetry, providing strong constraints on dust scattering. Polarization maps reveal asymmetric jet-like structures, indicating active regions shaped by solar heating and offering new insights into dust properties and grain-size distributions at extreme phase angles |
