Table 1.
Observed and derived parameters for PSR J2021+4026
| RA (J2000.0) (a) |
 |
||
| Dec (J2000.0) (a) |
 |
||
| Ė (erg s−1) | 1.2 × 1035 | ||
| Bs (G) | 4.0 × 1012 | ||
| τc (yr) | 73 000 − 77 000 | ||
| τSNR (yr) (b) | 6600 | ||
| dSNR (kpc) (c) | 1.5 ± 0.5 | ||
| Low γ-ray state | Post-relaxation state | New low γ-ray state | |
| 2011 Oct.–2014 Dec. | 2014 Dec.–2018 Feb. | 2018 Feb.–… | |
| MJD range (d) | 55 857 − 56 943 | 57 062 − 57 565 | 58 244 − 58 722 |
| Epoch zero (MJD) | 56 400 | 57 200 | 58 400 |
| P (s) | 0.26532469511(1) | 0.26532861459(4) | 0.26533428586(2) |
| Ṗ (s s−1) | 5.7710(1) × 10−14 | 5.447(4) × 10−14 | 5.6480(6) × 10−14 |
 (s s−2) |
+1.4(5) × 10−24 | −2.5(4) × 10−23 | +2.2(1) × 10−24 |
Notes. Numbers in parentheses show the 1σ uncertainty for the last digits.
The position is derived from Ray et al. (2011).
SNR G78.2+2.1 adiabatic age is derived from Uchiyama et al. (2002).
SNR G78.2+2.1 distance is derived from Landecker et al. (1980).
The ephemerides are derived from Zhao et al. (2017) and Takata et al. (2020).
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