SN1987A
The nascent core-collapse supernova remnant SN1987A presents a unique opportunity to observe the rapid time evolution of a non-equilibrium ionization (NEI) collisional plasma at early evolutionary timescales. During the XRISM mission life, the NEI plasma emission from the ejecta is expected to become dominant as compared to the emission from the surrounding equatorial ring and HII regions. The minimal goal is to separate and characterize the ejecta emission by the high-resolution spectra. The ideal goal is to measure the time evolution with two observations to directly study the structure and chemical composition of the ejecta to limit progenitor types. Another bonus is to observationally verify the Rankine-Hugoniot relation from ion temperatures by species.
obsid = 300021010 / Unique Observation/Sequence Number
object = SN1987A / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 83.8667436601168 / Right Ascension (Pointing Position) (deg)
dec = -69.268637168912 / Declination (Pointing Position) (deg)
roll_angle = 31.0129306823298 / Roll Angle (deg)
start_time = 2024-06-17T18:20:04 / Start Time of the Observation
stop_time = 2024-06-22T14:01:04 / Stop Time of the Observation
exposure = 348866.1557652 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date