4U1820-30
4U 1820-30 is a bright Neutron star low-mass X-ray binary with poorly understood geometry and Fe Ka; origin. While independent studies detected a broad Fe Ka feature in 4U 1820-30, there was substantial disagreement regarding its shape and origin. An 80 ks XRISM/Resolve spectrum will address the controversy by revealing the spectral details of the Fe Ka complex in 4U 1820-30 and distinguishing between inner accretion disk, accretion disk corona, and disk wind origin.
obsid = 202041010 / Unique Observation/Sequence Number
object = 4U1820-30 / Object name
pi_name = CHAKRABORTY PRIYANKA / Proposal Principal Investigator Name
ra = 275.918640983741 / Right Ascension (Pointing Position) (deg)
dec = -30.361077359616 / Declination (Pointing Position) (deg)
roll_angle = 84.7902294842941 / Roll Angle (deg)
start_time = 2026-03-02T13:34:04 / Start Time of the Observation
stop_time = 2026-03-04T18:54:04 / Stop Time of the Observation
exposure = 89849.991217 / Effective Total Observation Exposure (s)
public_date= 2027-03-13 / Public Date