| Parameter |
Value |
| Designation |
P/2020 T3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-20T11:20:03.816960Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:13:00Z |
| Obs used |
181 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
33.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-10T08:48:39.168000Z |
| Discovery magnitude (MPC) |
21.30 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-12-02.0000000 |
| e |
0.59149152 |
| q (au) |
1.436615 |
| a (au) |
3.516732 |
| i (deg) |
7.295760 |
| Ω (om, deg) |
74.020875 |
| ω (w, deg) |
357.042704 |
| M (ma, deg) |
352.606384 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.642 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.642 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-09-09 |
2021-01-18 |
+15.9275 |
-3.268 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:22:05.73 |
-23:31:26.4 |
HIP 100386 |
8.69 |
| 2026-03-26 12:00 |
20:22:30.26 |
-23:30:42.3 |
HIP 100386 |
13.99 |
| 2026-03-27 00:00 |
20:22:54.67 |
-23:29:58.6 |
HIP 100386 |
19.47 |
| 2026-03-27 12:00 |
20:23:18.96 |
-23:29:15.3 |
HIP 100633 |
13.92 |
| 2026-03-28 00:00 |
20:23:43.14 |
-23:28:32.4 |
HIP 100633 |
8.36 |
| 2026-03-28 12:00 |
20:24:07.20 |
-23:27:49.9 |
HIP 100633 |
2.93 |
| 2026-03-29 00:00 |
20:24:31.14 |
-23:27:07.8 |
HIP 100633 |
3.00 |
| 2026-03-29 12:00 |
20:24:54.96 |
-23:26:26.0 |
HIP 100633 |
8.38 |
| 2026-03-30 00:00 |
20:25:18.67 |
-23:25:44.7 |
HIP 100633 |
13.83 |
| 2026-03-30 12:00 |
20:25:42.25 |
-23:25:03.9 |
HIP 100718 |
15.97 |
| 2026-03-31 00:00 |
20:26:05.71 |
-23:24:23.4 |
HIP 100718 |
18.61 |
| 2026-03-31 12:00 |
20:26:29.04 |
-23:23:43.4 |
HIP 100718 |
22.27 |
| 2026-04-01 00:00 |
20:26:52.26 |
-23:23:03.8 |
HIP 100718 |
26.51 |
| 2026-04-01 12:00 |
20:27:15.34 |
-23:22:24.7 |
HIP 100958 |
24.81 |
| 2026-04-02 00:00 |
20:27:38.31 |
-23:21:46.1 |
HIP 100958 |
22.05 |
| 2026-04-02 12:00 |
20:28:01.14 |
-23:21:07.9 |
HIP 100958 |
20.35 |
| 2026-04-03 00:00 |
20:28:23.85 |
-23:20:30.2 |
HIP 100958 |
19.95 |
| 2026-04-03 12:00 |
20:28:46.43 |
-23:19:52.9 |
HIP 100958 |
20.89 |
| 2026-04-04 00:00 |
20:29:08.88 |
-23:19:16.2 |
HIP 100958 |
23.01 |
| 2026-04-04 12:00 |
20:29:31.19 |
-23:18:40.0 |
HIP 100958 |
25.99 |
| 2026-04-05 00:00 |
20:29:53.38 |
-23:18:04.2 |
HIP 101100 |
27.60 |
| 2026-04-05 12:00 |
20:30:15.43 |
-23:17:29.0 |
HIP 101100 |
28.14 |
| 2026-04-06 00:00 |
20:30:37.35 |
-23:16:54.3 |
HIP 101306 |
25.35 |
| 2026-04-06 12:00 |
20:30:59.13 |
-23:16:20.1 |
HIP 101306 |
22.12 |
| 2026-04-07 00:00 |
20:31:20.78 |
-23:15:46.4 |
HIP 101306 |
19.67 |
| 2026-04-07 12:00 |
20:31:42.29 |
-23:15:13.3 |
HIP 101306 |
18.29 |
| 2026-04-08 00:00 |
20:32:03.66 |
-23:14:40.8 |
HIP 101306 |
18.19 |
| 2026-04-08 12:00 |
20:32:24.89 |
-23:14:08.8 |
HIP 101306 |
19.37 |
| 2026-04-09 00:00 |
20:32:45.98 |
-23:13:37.4 |
HIP 101500 |
18.79 |
| 2026-04-09 12:00 |
20:33:06.93 |
-23:13:06.5 |
HIP 101500 |
14.05 |
| 2026-04-10 00:00 |
20:33:27.73 |
-23:12:36.3 |
HIP 101500 |
9.45 |
| 2026-04-10 12:00 |
20:33:48.39 |
-23:12:06.6 |
HIP 101500 |
5.26 |
| 2026-04-11 00:00 |
20:34:08.91 |
-23:11:37.6 |
HIP 101500 |
3.37 |
| 2026-04-11 12:00 |
20:34:29.27 |
-23:11:09.1 |
HIP 101500 |
6.29 |
| 2026-04-12 00:00 |
20:34:49.49 |
-23:10:41.3 |
HIP 101500 |
10.55 |
| 2026-04-12 12:00 |
20:35:09.56 |
-23:10:14.1 |
HIP 101500 |
15.02 |
| 2026-04-13 00:00 |
20:35:29.47 |
-23:09:47.5 |
HIP 101500 |
19.53 |
| 2026-04-13 12:00 |
20:35:49.24 |
-23:09:21.6 |
HIP 101601 |
23.29 |
| 2026-04-14 00:00 |
20:36:08.85 |
-23:08:56.3 |
HIP 101601 |
24.99 |
| 2026-04-14 12:00 |
20:36:28.31 |
-23:08:31.7 |
HIP 101658 |
25.87 |
| 2026-04-15 00:00 |
20:36:47.60 |
-23:08:07.8 |
HIP 101658 |
26.04 |
| 2026-04-15 12:00 |
20:37:06.75 |
-23:07:44.6 |
HIP 101658 |
26.96 |
| 2026-04-16 00:00 |
20:37:25.73 |
-23:07:22.0 |
HIP 101658 |
28.53 |