| 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) |
| 2026-05-12 00:00 |
14:36:46.11 |
-52:58:19.3 |
HIP 71494 |
6.63 |
| 2026-05-12 12:00 |
14:36:32.00 |
-52:57:52.4 |
HIP 71494 |
8.38 |
| 2026-05-13 00:00 |
14:36:17.92 |
-52:57:24.8 |
HIP 71494 |
10.30 |
| 2026-05-13 12:00 |
14:36:03.88 |
-52:56:56.5 |
HIP 71494 |
12.30 |
| 2026-05-14 00:00 |
14:35:49.86 |
-52:56:27.5 |
HIP 71494 |
14.35 |
| 2026-05-14 12:00 |
14:35:35.88 |
-52:55:57.7 |
HIP 71494 |
16.43 |
| 2026-05-15 00:00 |
14:35:21.93 |
-52:55:27.3 |
HIP 71312 |
16.97 |
| 2026-05-15 12:00 |
14:35:08.02 |
-52:54:56.1 |
HIP 71312 |
17.18 |
| 2026-05-16 00:00 |
14:34:54.15 |
-52:54:24.3 |
HIP 71312 |
17.67 |
| 2026-05-16 12:00 |
14:34:40.31 |
-52:53:51.8 |
HIP 71182 |
16.87 |
| 2026-05-17 00:00 |
14:34:26.52 |
-52:53:18.5 |
HIP 71182 |
15.18 |
| 2026-05-17 12:00 |
14:34:12.77 |
-52:52:44.7 |
HIP 71182 |
13.61 |
| 2026-05-18 00:00 |
14:33:59.06 |
-52:52:10.1 |
HIP 71182 |
12.22 |
| 2026-05-18 12:00 |
14:33:45.40 |
-52:51:34.9 |
HIP 71182 |
11.06 |
| 2026-05-19 00:00 |
14:33:31.78 |
-52:50:59.0 |
HIP 71182 |
10.22 |
| 2026-05-19 12:00 |
14:33:18.22 |
-52:50:22.5 |
HIP 71182 |
9.77 |
| 2026-05-20 00:00 |
14:33:04.69 |
-52:49:45.3 |
HIP 71182 |
9.77 |
| 2026-05-20 12:00 |
14:32:51.22 |
-52:49:07.5 |
HIP 71182 |
10.21 |
| 2026-05-21 00:00 |
14:32:37.80 |
-52:48:29.1 |
HIP 71135 |
9.97 |
| 2026-05-21 12:00 |
14:32:24.44 |
-52:47:50.0 |
HIP 71135 |
10.01 |
| 2026-05-22 00:00 |
14:32:11.12 |
-52:47:10.4 |
HIP 71135 |
10.48 |
| 2026-05-22 12:00 |
14:31:57.86 |
-52:46:30.1 |
HIP 71135 |
11.32 |
| 2026-05-23 00:00 |
14:31:44.66 |
-52:45:49.2 |
HIP 71135 |
12.46 |
| 2026-05-23 12:00 |
14:31:31.51 |
-52:45:07.7 |
HIP 71135 |
13.81 |
| 2026-05-24 00:00 |
14:31:18.42 |
-52:44:25.6 |
HIP 71135 |
15.33 |
| 2026-05-24 12:00 |
14:31:05.39 |
-52:43:43.0 |
HIP 71135 |
16.96 |
| 2026-05-25 00:00 |
14:30:52.42 |
-52:42:59.7 |
HIP 70850 |
17.73 |
| 2026-05-25 12:00 |
14:30:39.51 |
-52:42:15.9 |
HIP 70850 |
16.71 |
| 2026-05-26 00:00 |
14:30:26.67 |
-52:41:31.5 |
HIP 70850 |
15.90 |
| 2026-05-26 12:00 |
14:30:13.88 |
-52:40:46.6 |
HIP 70850 |
15.36 |
| 2026-05-27 00:00 |
14:30:01.16 |
-52:40:01.1 |
HIP 70850 |
15.09 |
| 2026-05-27 12:00 |
14:29:48.51 |
-52:39:15.1 |
HIP 70850 |
15.11 |
| 2026-05-28 00:00 |
14:29:35.92 |
-52:38:28.5 |
HIP 70850 |
15.42 |
| 2026-05-28 12:00 |
14:29:23.40 |
-52:37:41.4 |
HIP 70850 |
16.00 |
| 2026-05-29 00:00 |
14:29:10.94 |
-52:36:53.8 |
HIP 70689 |
16.19 |
| 2026-05-29 12:00 |
14:28:58.56 |
-52:36:05.7 |
HIP 70689 |
14.15 |
| 2026-05-30 00:00 |
14:28:46.24 |
-52:35:17.0 |
HIP 70689 |
12.12 |
| 2026-05-30 12:00 |
14:28:34.00 |
-52:34:27.9 |
HIP 70689 |
10.10 |
| 2026-05-31 00:00 |
14:28:21.83 |
-52:33:38.2 |
HIP 70689 |
8.09 |
| 2026-05-31 12:00 |
14:28:09.73 |
-52:32:48.1 |
HIP 70689 |
6.11 |
| 2026-06-01 00:00 |
14:27:57.70 |
-52:31:57.5 |
HIP 70689 |
4.17 |
| 2026-06-01 12:00 |
14:27:45.75 |
-52:31:06.4 |
HIP 70689 |
2.36 |
| 2026-06-02 00:00 |
14:27:33.87 |
-52:30:14.9 |
HIP 70689 |
1.36 |