| 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) |
| 2026-07-29 00:00 |
20:19:57.57 |
-27:19:58.0 |
HIP 100324 |
10.76 |
| 2026-07-29 12:00 |
20:19:29.63 |
-27:21:50.8 |
HIP 100324 |
17.04 |
| 2026-07-30 00:00 |
20:19:01.66 |
-27:23:42.7 |
HIP 100136 |
19.44 |
| 2026-07-30 12:00 |
20:18:33.66 |
-27:25:33.5 |
HIP 100136 |
21.23 |
| 2026-07-31 00:00 |
20:18:05.64 |
-27:27:23.3 |
HIP 99932 |
22.13 |
| 2026-07-31 12:00 |
20:17:37.61 |
-27:29:12.0 |
HIP 99932 |
15.73 |
| 2026-08-01 00:00 |
20:17:09.57 |
-27:30:59.7 |
HIP 99932 |
9.44 |
| 2026-08-01 12:00 |
20:16:41.52 |
-27:32:46.2 |
HIP 99932 |
3.82 |
| 2026-08-02 00:00 |
20:16:13.47 |
-27:34:31.6 |
HIP 99932 |
4.87 |
| 2026-08-02 12:00 |
20:15:45.43 |
-27:36:15.9 |
HIP 99932 |
10.78 |
| 2026-08-03 00:00 |
20:15:17.41 |
-27:37:58.9 |
HIP 99932 |
17.08 |
| 2026-08-03 12:00 |
20:14:49.40 |
-27:39:40.9 |
HIP 99932 |
23.45 |
| 2026-08-04 00:00 |
20:14:21.42 |
-27:41:21.6 |
HIP 99932 |
29.83 |
| 2026-08-04 12:00 |
20:13:53.47 |
-27:43:01.1 |
HIP 99932 |
36.21 |
| 2026-08-05 00:00 |
20:13:25.56 |
-27:44:39.3 |
HIP 99499 |
35.10 |
| 2026-08-05 12:00 |
20:12:57.68 |
-27:46:16.3 |
HIP 99499 |
32.38 |
| 2026-08-06 00:00 |
20:12:29.86 |
-27:47:52.1 |
HIP 99499 |
30.75 |
| 2026-08-06 12:00 |
20:12:02.09 |
-27:49:26.5 |
HIP 99363 |
26.95 |
| 2026-08-07 00:00 |
20:11:34.38 |
-27:50:59.7 |
HIP 99363 |
21.75 |
| 2026-08-07 12:00 |
20:11:06.74 |
-27:52:31.6 |
HIP 99363 |
17.32 |
| 2026-08-08 00:00 |
20:10:39.18 |
-27:54:02.1 |
HIP 99363 |
14.35 |
| 2026-08-08 12:00 |
20:10:11.69 |
-27:55:31.3 |
HIP 99290 |
11.48 |
| 2026-08-09 00:00 |
20:09:44.28 |
-27:56:59.1 |
HIP 99290 |
5.29 |
| 2026-08-09 12:00 |
20:09:16.97 |
-27:58:25.6 |
HIP 99290 |
1.32 |
| 2026-08-10 00:00 |
20:08:49.75 |
-27:59:50.6 |
HIP 99290 |
7.21 |
| 2026-08-10 12:00 |
20:08:22.64 |
-28:01:14.3 |
HIP 99290 |
13.33 |
| 2026-08-11 00:00 |
20:07:55.64 |
-28:02:36.6 |
HIP 99290 |
19.43 |
| 2026-08-11 12:00 |
20:07:28.75 |
-28:03:57.5 |
HIP 99057 |
21.26 |
| 2026-08-12 00:00 |
20:07:01.99 |
-28:05:16.9 |
HIP 99057 |
17.69 |
| 2026-08-12 12:00 |
20:06:35.35 |
-28:06:34.9 |
HIP 99057 |
15.73 |
| 2026-08-13 00:00 |
20:06:08.85 |
-28:07:51.4 |
HIP 99057 |
15.95 |
| 2026-08-13 12:00 |
20:05:42.49 |
-28:09:06.5 |
HIP 98883 |
13.78 |
| 2026-08-14 00:00 |
20:05:16.27 |
-28:10:20.1 |
HIP 98883 |
8.48 |
| 2026-08-14 12:00 |
20:04:50.21 |
-28:11:32.2 |
HIP 98883 |
4.89 |
| 2026-08-15 00:00 |
20:04:24.30 |
-28:12:42.9 |
HIP 98883 |
6.67 |
| 2026-08-15 12:00 |
20:03:58.56 |
-28:13:52.1 |
HIP 98883 |
11.50 |
| 2026-08-16 00:00 |
20:03:32.98 |
-28:14:59.7 |
HIP 98693 |
13.27 |
| 2026-08-16 12:00 |
20:03:07.58 |
-28:16:05.9 |
HIP 98693 |
8.44 |
| 2026-08-17 00:00 |
20:02:42.36 |
-28:17:10.6 |
HIP 98693 |
5.63 |
| 2026-08-17 12:00 |
20:02:17.33 |
-28:18:13.8 |
HIP 98693 |
7.46 |
| 2026-08-18 00:00 |
20:01:52.48 |
-28:19:15.4 |
HIP 98693 |
11.91 |
| 2026-08-18 12:00 |
20:01:27.83 |
-28:20:15.6 |
HIP 98693 |
16.99 |
| 2026-08-19 00:00 |
20:01:03.38 |
-28:21:14.3 |
HIP 98496 |
15.20 |