SS433
We propose an 80 ks observation of the Galactic microquasar SS 433 within the orbital phase of 0.4-0.6 (where the phase zero corresponds to the superior conjunction of the compact object). The main aim is to measure the radial velocity curve of the compact object by combining the PV-phase and AO-1 data and the data from the proposed observation, and thereby determine the mass of the compact object, which has long been in debate. In addition, we constrain the Ni/Fe abundance ratio in the accretion disk and investigate if it is lower than the value of the jets, as suggested in a previous XMM-Newton observation. Furthermore, the spatial structure of the jet is studied by comparing all the XRISM spectra obtained at different phases of the jet precession.
obsid = 202051010 / Unique Observation/Sequence Number
object = SS433 / Object name
pi_name = SHIDATSU MEGUMI / Proposal Principal Investigator Name
ra = 287.956639311338 / Right Ascension (Pointing Position) (deg)
dec = 4.98367335676325 / Declination (Pointing Position) (deg)
roll_angle = 95.5338655265342 / Roll Angle (deg)
start_time = 2026-03-10T04:58:04 / Start Time of the Observation
stop_time = 2026-03-12T06:18:04 / Stop Time of the Observation
exposure = 88802.020509 / Effective Total Observation Exposure (s)
public_date= 2099-12-31 / Public Date