| Parameter |
Value |
| Designation |
C/2021 J1 (Maury-Attard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-02-19T11:39:16.738560Z |
| Orbit solution date (soln_date, UTC) |
2022-02-03T20:43:07Z |
| Obs used |
106 |
| NEO |
- |
| M1 |
17.100 |
| K1 |
5.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-04-27.0000000 |
| e |
0.93438376 |
| q (au) |
1.740634 |
| a (au) |
26.527482 |
| i (deg) |
92.719322 |
| Ω (om, deg) |
88.320215 |
| ω (w, deg) |
147.329778 |
| M (ma, deg) |
0.479817 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.232 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.232 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.512 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:02:44.29 |
-40:45:29.9 |
HIP 28631 |
23.95 |
| 2026-06-01 12:00 |
06:02:54.08 |
-40:44:38.9 |
HIP 28631 |
24.90 |
| 2026-06-02 00:00 |
06:03:03.90 |
-40:43:48.7 |
HIP 28631 |
25.97 |
| 2026-06-02 12:00 |
06:03:13.74 |
-40:42:59.4 |
HIP 28631 |
27.14 |
| 2026-06-03 00:00 |
06:03:23.60 |
-40:42:10.9 |
HIP 28631 |
28.39 |
| 2026-06-03 12:00 |
06:03:33.48 |
-40:41:23.2 |
HIP 28745 |
28.90 |
| 2026-06-04 00:00 |
06:03:43.38 |
-40:40:36.3 |
HIP 28745 |
29.22 |
| 2026-06-04 12:00 |
06:03:53.29 |
-40:39:50.3 |
HIP 28745 |
29.66 |
| 2026-06-05 00:00 |
06:04:03.23 |
-40:39:05.1 |
HIP 28745 |
30.21 |
| 2026-06-05 12:00 |
06:04:13.18 |
-40:38:20.7 |
HIP 28745 |
30.88 |
| 2026-06-06 00:00 |
06:04:23.14 |
-40:37:37.2 |
HIP 28745 |
31.64 |
| 2026-06-06 12:00 |
06:04:33.13 |
-40:36:54.5 |
HIP 28745 |
32.50 |
| 2026-06-07 00:00 |
06:04:43.13 |
-40:36:12.6 |
HIP 28745 |
33.45 |
| 2026-06-07 12:00 |
06:04:53.14 |
-40:35:31.6 |
HIP 28857 |
32.65 |
| 2026-06-08 00:00 |
06:05:03.17 |
-40:34:51.4 |
HIP 28857 |
31.63 |
| 2026-06-08 12:00 |
06:05:13.21 |
-40:34:12.0 |
HIP 28857 |
30.73 |
| 2026-06-09 00:00 |
06:05:23.27 |
-40:33:33.5 |
HIP 28857 |
29.95 |
| 2026-06-09 12:00 |
06:05:33.34 |
-40:32:55.8 |
HIP 28857 |
29.30 |
| 2026-06-10 00:00 |
06:05:43.42 |
-40:32:19.0 |
HIP 28857 |
28.79 |
| 2026-06-10 12:00 |
06:05:53.51 |
-40:31:43.0 |
HIP 28857 |
28.44 |
| 2026-06-11 00:00 |
06:06:03.62 |
-40:31:07.9 |
HIP 28857 |
28.23 |
| 2026-06-11 12:00 |
06:06:13.73 |
-40:30:33.6 |
HIP 28857 |
28.19 |
| 2026-06-12 00:00 |
06:06:23.86 |
-40:30:00.2 |
HIP 28857 |
28.30 |
| 2026-06-12 12:00 |
06:06:33.99 |
-40:29:27.6 |
HIP 28857 |
28.56 |
| 2026-06-13 00:00 |
06:06:44.14 |
-40:28:55.8 |
HIP 28857 |
28.98 |
| 2026-06-13 12:00 |
06:06:54.29 |
-40:28:24.9 |
HIP 28857 |
29.54 |
| 2026-06-14 00:00 |
06:07:04.45 |
-40:27:54.9 |
HIP 28857 |
30.24 |
| 2026-06-14 12:00 |
06:07:14.62 |
-40:27:25.7 |
HIP 28857 |
31.06 |
| 2026-06-15 00:00 |
06:07:24.79 |
-40:26:57.3 |
HIP 28857 |
32.00 |
| 2026-06-15 12:00 |
06:07:34.97 |
-40:26:29.8 |
HIP 29263 |
30.06 |
| 2026-06-16 00:00 |
06:07:45.15 |
-40:26:03.2 |
HIP 29263 |
28.08 |
| 2026-06-16 12:00 |
06:07:55.34 |
-40:25:37.4 |
HIP 29263 |
26.09 |
| 2026-06-17 00:00 |
06:08:05.53 |
-40:25:12.5 |
HIP 29263 |
24.11 |
| 2026-06-17 12:00 |
06:08:15.73 |
-40:24:48.4 |
HIP 29263 |
22.13 |
| 2026-06-18 00:00 |
06:08:25.92 |
-40:24:25.1 |
HIP 29263 |
20.15 |
| 2026-06-18 12:00 |
06:08:36.12 |
-40:24:02.7 |
HIP 29263 |
18.18 |
| 2026-06-19 00:00 |
06:08:46.32 |
-40:23:41.2 |
HIP 29263 |
16.20 |
| 2026-06-19 12:00 |
06:08:56.53 |
-40:23:20.5 |
HIP 29263 |
14.23 |
| 2026-06-20 00:00 |
06:09:06.73 |
-40:23:00.7 |
HIP 29263 |
12.26 |
| 2026-06-20 12:00 |
06:09:16.93 |
-40:22:41.7 |
HIP 29263 |
10.29 |
| 2026-06-21 00:00 |
06:09:27.13 |
-40:22:23.5 |
HIP 29263 |
8.33 |
| 2026-06-21 12:00 |
06:09:37.33 |
-40:22:06.2 |
HIP 29263 |
6.36 |
| 2026-06-22 00:00 |
06:09:47.53 |
-40:21:49.7 |
HIP 29263 |
4.40 |