SN1987A
SN1987A is the unique SN in which human beings can see the evolution from SN to SNR. Now 37 years post-explosion, the predominant X-ray emissions are transitioning from the shocked CSM to ejecta. Resolve spectra in PV (2024) are well described by NEI model from 'non-metal rich' ejecta, which aligns with the outer low-metallicity envelope of ejecta (XRISM collaboration 2025). Therefore, the reverse shock has not yet reached the inner pure ejecta. The line Doppler widths in PV reflect bulk motion of ejecta; AO-2 (2026) observation will examine 10^{9-10} km inner part of ejecta. Per 3D MHD simulations (Orlando et al 2025), AO-2 and future observations will highlight 'pure ejecta' emissions, which grow mostly during AO-2. Such new features are crucial for understanding SN to SNR evolution.
obsid = 202049010 / Unique Observation/Sequence Number
object = SN1987A / Object name
pi_name = TERADA YUKIKATSU / Proposal Principal Investigator Name
ra = 83.8680221776682 / Right Ascension (Pointing Position) (deg)
dec = -69.2700988348846 / Declination (Pointing Position) (deg)
roll_angle = 301.007276521104 / Roll Angle (deg)
start_time = 2026-04-13T17:20:04 / Start Time of the Observation
stop_time = 2026-04-21T22:22:04 / Stop Time of the Observation
exposure = 505580.3132 / Effective Total Observation Exposure (s)
public_date= 2027-05-12 / Public Date