| Parameter |
Value |
| Designation |
C/2020 T4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-05T05:56:29.909760Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:53Z |
| Obs used |
171 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-15T14:08:31.113600Z |
| Discovery magnitude (MPC) |
21.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-11-23.0000000 |
| e |
1.00004087 |
| q (au) |
2.191878 |
| a (au) |
-53626.423966 |
| i (deg) |
83.817389 |
| Ω (om, deg) |
50.622331 |
| ω (w, deg) |
79.602529 |
| M (ma, deg) |
-0.000018 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.969 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.969 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.849 |
| k |
0.999 |
| 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) |
| 2026-03-26 00:00 |
14:57:50.56 |
-52:41:28.6 |
HIP 73095 |
15.81 |
| 2026-03-26 12:00 |
14:57:39.66 |
-52:42:16.0 |
HIP 73095 |
13.98 |
| 2026-03-27 00:00 |
14:57:28.68 |
-52:43:02.7 |
HIP 73095 |
12.14 |
| 2026-03-27 12:00 |
14:57:17.60 |
-52:43:48.7 |
HIP 73095 |
10.30 |
| 2026-03-28 00:00 |
14:57:06.44 |
-52:44:34.0 |
HIP 73095 |
8.45 |
| 2026-03-28 12:00 |
14:56:55.19 |
-52:45:18.5 |
HIP 73095 |
6.60 |
| 2026-03-29 00:00 |
14:56:43.85 |
-52:46:02.3 |
HIP 73095 |
4.76 |
| 2026-03-29 12:00 |
14:56:32.43 |
-52:46:45.4 |
HIP 73095 |
2.93 |
| 2026-03-30 00:00 |
14:56:20.92 |
-52:47:27.7 |
HIP 73095 |
1.24 |
| 2026-03-30 12:00 |
14:56:09.33 |
-52:48:09.3 |
HIP 73095 |
1.26 |
| 2026-03-31 00:00 |
14:55:57.66 |
-52:48:50.1 |
HIP 73095 |
2.97 |
| 2026-03-31 12:00 |
14:55:45.91 |
-52:49:30.2 |
HIP 73095 |
4.82 |
| 2026-04-01 00:00 |
14:55:34.07 |
-52:50:09.5 |
HIP 73095 |
6.71 |
| 2026-04-01 12:00 |
14:55:22.16 |
-52:50:48.1 |
HIP 73095 |
8.61 |
| 2026-04-02 00:00 |
14:55:10.17 |
-52:51:25.9 |
HIP 73095 |
10.52 |
| 2026-04-02 12:00 |
14:54:58.10 |
-52:52:02.9 |
HIP 73095 |
12.44 |
| 2026-04-03 00:00 |
14:54:45.96 |
-52:52:39.2 |
HIP 73095 |
14.37 |
| 2026-04-03 12:00 |
14:54:33.74 |
-52:53:14.7 |
HIP 73095 |
16.31 |
| 2026-04-04 00:00 |
14:54:21.44 |
-52:53:49.4 |
HIP 73095 |
18.25 |
| 2026-04-04 12:00 |
14:54:09.08 |
-52:54:23.4 |
HIP 73095 |
20.20 |
| 2026-04-05 00:00 |
14:53:56.64 |
-52:54:56.6 |
HIP 73095 |
22.15 |
| 2026-04-05 12:00 |
14:53:44.13 |
-52:55:29.0 |
HIP 72787 |
23.22 |
| 2026-04-06 00:00 |
14:53:31.55 |
-52:56:00.6 |
HIP 72787 |
22.01 |
| 2026-04-06 12:00 |
14:53:18.90 |
-52:56:31.4 |
HIP 72787 |
20.92 |
| 2026-04-07 00:00 |
14:53:06.19 |
-52:57:01.4 |
HIP 72787 |
19.98 |
| 2026-04-07 12:00 |
14:52:53.40 |
-52:57:30.7 |
HIP 72787 |
19.21 |
| 2026-04-08 00:00 |
14:52:40.55 |
-52:57:59.1 |
HIP 72787 |
18.63 |
| 2026-04-08 12:00 |
14:52:27.64 |
-52:58:26.7 |
HIP 72787 |
18.26 |
| 2026-04-09 00:00 |
14:52:14.67 |
-52:58:53.6 |
HIP 72787 |
18.12 |
| 2026-04-09 12:00 |
14:52:01.63 |
-52:59:19.6 |
HIP 72787 |
18.21 |
| 2026-04-10 00:00 |
14:51:48.53 |
-52:59:44.8 |
HIP 72787 |
18.54 |
| 2026-04-10 12:00 |
14:51:35.38 |
-53:00:09.2 |
HIP 72787 |
19.09 |
| 2026-04-11 00:00 |
14:51:22.16 |
-53:00:32.8 |
HIP 72787 |
19.85 |
| 2026-04-11 12:00 |
14:51:08.89 |
-53:00:55.6 |
HIP 72533 |
20.39 |
| 2026-04-12 00:00 |
14:50:55.56 |
-53:01:17.6 |
HIP 72533 |
19.55 |
| 2026-04-12 12:00 |
14:50:42.17 |
-53:01:38.8 |
HIP 72533 |
18.88 |
| 2026-04-13 00:00 |
14:50:28.74 |
-53:01:59.1 |
HIP 72533 |
18.40 |
| 2026-04-13 12:00 |
14:50:15.25 |
-53:02:18.6 |
HIP 72533 |
18.12 |
| 2026-04-14 00:00 |
14:50:01.71 |
-53:02:37.3 |
HIP 72533 |
18.07 |
| 2026-04-14 12:00 |
14:49:48.12 |
-53:02:55.2 |
HIP 72533 |
18.23 |
| 2026-04-15 00:00 |
14:49:34.49 |
-53:03:12.2 |
HIP 72533 |
18.61 |
| 2026-04-15 12:00 |
14:49:20.80 |
-53:03:28.4 |
HIP 72533 |
19.20 |
| 2026-04-16 00:00 |
14:49:07.07 |
-53:03:43.8 |
HIP 72533 |
19.98 |