| 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) |
| 2026-06-01 00:00 |
20:52:24.48 |
-23:38:17.1 |
HIP 103071 |
12.08 |
| 2026-06-01 12:00 |
20:52:23.14 |
-23:39:28.4 |
HIP 103071 |
11.48 |
| 2026-06-02 00:00 |
20:52:21.52 |
-23:40:40.8 |
HIP 103071 |
11.04 |
| 2026-06-02 12:00 |
20:52:19.63 |
-23:41:54.4 |
HIP 103071 |
10.76 |
| 2026-06-03 00:00 |
20:52:17.46 |
-23:43:09.2 |
HIP 103071 |
10.70 |
| 2026-06-03 12:00 |
20:52:15.00 |
-23:44:25.2 |
HIP 103071 |
10.85 |
| 2026-06-04 00:00 |
20:52:12.27 |
-23:45:42.4 |
HIP 103071 |
11.25 |
| 2026-06-04 12:00 |
20:52:09.25 |
-23:47:00.7 |
HIP 103071 |
11.86 |
| 2026-06-05 00:00 |
20:52:05.95 |
-23:48:20.2 |
HIP 103071 |
12.69 |
| 2026-06-05 12:00 |
20:52:02.37 |
-23:49:40.9 |
HIP 103071 |
13.70 |
| 2026-06-06 00:00 |
20:51:58.50 |
-23:51:02.8 |
HIP 103071 |
14.88 |
| 2026-06-06 12:00 |
20:51:54.35 |
-23:52:25.8 |
HIP 103071 |
16.21 |
| 2026-06-07 00:00 |
20:51:49.91 |
-23:53:50.0 |
HIP 103071 |
17.66 |
| 2026-06-07 12:00 |
20:51:45.18 |
-23:55:15.3 |
HIP 103071 |
19.23 |
| 2026-06-08 00:00 |
20:51:40.17 |
-23:56:41.8 |
HIP 103071 |
20.90 |
| 2026-06-08 12:00 |
20:51:34.86 |
-23:58:09.4 |
HIP 103071 |
22.66 |
| 2026-06-09 00:00 |
20:51:29.27 |
-23:59:38.2 |
HIP 103065 |
23.43 |
| 2026-06-09 12:00 |
20:51:23.38 |
-24:01:08.1 |
HIP 103065 |
23.78 |
| 2026-06-10 00:00 |
20:51:17.20 |
-24:02:39.1 |
HIP 103065 |
24.33 |
| 2026-06-10 12:00 |
20:51:10.73 |
-24:04:11.3 |
HIP 103065 |
25.11 |
| 2026-06-11 00:00 |
20:51:03.97 |
-24:05:44.6 |
HIP 103065 |
26.09 |
| 2026-06-11 12:00 |
20:50:56.91 |
-24:07:19.0 |
HIP 103065 |
27.28 |
| 2026-06-12 00:00 |
20:50:49.56 |
-24:08:54.5 |
HIP 103065 |
28.65 |
| 2026-06-12 12:00 |
20:50:41.92 |
-24:10:31.1 |
HIP 103065 |
30.21 |
| 2026-06-13 00:00 |
20:50:33.98 |
-24:12:08.8 |
HIP 103065 |
31.93 |
| 2026-06-13 12:00 |
20:50:25.75 |
-24:13:47.5 |
HIP 103065 |
33.81 |
| 2026-06-14 00:00 |
20:50:17.22 |
-24:15:27.3 |
HIP 102822 |
34.44 |
| 2026-06-14 12:00 |
20:50:08.39 |
-24:17:08.2 |
HIP 102822 |
32.46 |
| 2026-06-15 00:00 |
20:49:59.28 |
-24:18:50.1 |
HIP 102822 |
30.55 |
| 2026-06-15 12:00 |
20:49:49.86 |
-24:20:33.1 |
HIP 102822 |
28.75 |
| 2026-06-16 00:00 |
20:49:40.15 |
-24:22:17.1 |
HIP 102822 |
27.09 |
| 2026-06-16 12:00 |
20:49:30.15 |
-24:24:02.0 |
HIP 102822 |
25.62 |
| 2026-06-17 00:00 |
20:49:19.85 |
-24:25:48.0 |
HIP 102822 |
24.41 |
| 2026-06-17 12:00 |
20:49:09.26 |
-24:27:35.0 |
HIP 102822 |
23.52 |
| 2026-06-18 00:00 |
20:48:58.37 |
-24:29:22.9 |
HIP 102822 |
23.00 |
| 2026-06-18 12:00 |
20:48:47.19 |
-24:31:11.8 |
HIP 102822 |
22.91 |
| 2026-06-19 00:00 |
20:48:35.72 |
-24:33:01.6 |
HIP 102822 |
23.28 |
| 2026-06-19 12:00 |
20:48:23.96 |
-24:34:52.3 |
HIP 102822 |
24.11 |
| 2026-06-20 00:00 |
20:48:11.90 |
-24:36:44.0 |
HIP 102822 |
25.39 |
| 2026-06-20 12:00 |
20:47:59.56 |
-24:38:36.5 |
HIP 102516 |
25.72 |
| 2026-06-21 00:00 |
20:47:46.92 |
-24:40:29.9 |
HIP 102516 |
22.31 |
| 2026-06-21 12:00 |
20:47:34.00 |
-24:42:24.2 |
HIP 102516 |
18.84 |
| 2026-06-22 00:00 |
20:47:20.78 |
-24:44:19.3 |
HIP 102516 |
15.33 |