C/2020 H8 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2020 H8 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-06-04T04:42:35.982720Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:48Z |
| Obs used |
199 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
9.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-04-30T13:50:29.990400Z |
| Discovery magnitude (MPC) |
20.79 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-06-24.0000000 |
| e |
0.99237509 |
| q (au) |
4.674530 |
| a (au) |
613.060227 |
| i (deg) |
99.646917 |
| Ω (om, deg) |
68.406554 |
| ω (w, deg) |
128.895525 |
| M (ma, deg) |
0.001286 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.230 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.230 |
| n |
6.000 |
| gf |
0.973 |
| gb |
-0.700 |
| k |
0.827 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
13:05:18.67 |
-73:40:05.2 |
HIP 64047 |
10.80 |
| 2026-02-03 12:00 |
13:05:01.27 |
-73:41:50.3 |
HIP 64047 |
12.72 |
| 2026-02-04 00:00 |
13:04:43.59 |
-73:43:34.8 |
HIP 64047 |
14.71 |
| 2026-02-04 12:00 |
13:04:25.65 |
-73:45:18.6 |
HIP 64047 |
16.74 |
| 2026-02-05 00:00 |
13:04:07.42 |
-73:47:01.7 |
HIP 64047 |
18.80 |
| 2026-02-05 12:00 |
13:03:48.92 |
-73:48:44.1 |
HIP 64047 |
20.88 |
| 2026-02-06 00:00 |
13:03:30.15 |
-73:50:25.9 |
HIP 64047 |
22.98 |
| 2026-02-06 12:00 |
13:03:11.10 |
-73:52:07.0 |
HIP 63268 |
22.11 |
| 2026-02-07 00:00 |
13:02:51.77 |
-73:53:47.3 |
HIP 63268 |
20.78 |
| 2026-02-07 12:00 |
13:02:32.18 |
-73:55:26.9 |
HIP 63268 |
19.58 |
| 2026-02-08 00:00 |
13:02:12.30 |
-73:57:05.8 |
HIP 63268 |
18.54 |
| 2026-02-08 12:00 |
13:01:52.15 |
-73:58:44.0 |
HIP 63268 |
17.68 |
| 2026-02-09 00:00 |
13:01:31.73 |
-74:00:21.4 |
HIP 63268 |
17.03 |
| 2026-02-09 12:00 |
13:01:11.04 |
-74:01:58.0 |
HIP 63268 |
16.61 |
| 2026-02-10 00:00 |
13:00:50.07 |
-74:03:33.9 |
HIP 63268 |
16.45 |
| 2026-02-10 12:00 |
13:00:28.83 |
-74:05:08.9 |
HIP 63268 |
16.56 |
| 2026-02-11 00:00 |
13:00:07.31 |
-74:06:43.2 |
HIP 63268 |
16.92 |
| 2026-02-11 12:00 |
12:59:45.53 |
-74:08:16.6 |
HIP 63268 |
17.52 |
| 2026-02-12 00:00 |
12:59:23.47 |
-74:09:49.3 |
HIP 63268 |
18.35 |
| 2026-02-12 12:00 |
12:59:01.14 |
-74:11:21.1 |
HIP 63268 |
19.36 |
| 2026-02-13 00:00 |
12:58:38.55 |
-74:12:52.0 |
HIP 63154 |
18.91 |
| 2026-02-13 12:00 |
12:58:15.68 |
-74:14:22.1 |
HIP 63154 |
16.87 |
| 2026-02-14 00:00 |
12:57:52.55 |
-74:15:51.4 |
HIP 63154 |
14.87 |
| 2026-02-14 12:00 |
12:57:29.15 |
-74:17:19.7 |
HIP 63154 |
12.93 |
| 2026-02-15 00:00 |
12:57:05.49 |
-74:18:47.2 |
HIP 63154 |
11.08 |
| 2026-02-15 12:00 |
12:56:41.56 |
-74:20:13.7 |
HIP 63154 |
9.38 |
| 2026-02-16 00:00 |
12:56:17.37 |
-74:21:39.4 |
HIP 63154 |
7.92 |
| 2026-02-16 12:00 |
12:55:52.92 |
-74:23:04.1 |
HIP 63154 |
6.86 |
| 2026-02-17 00:00 |
12:55:28.21 |
-74:24:27.9 |
HIP 63154 |
6.41 |
| 2026-02-17 12:00 |
12:55:03.23 |
-74:25:50.7 |
HIP 63154 |
6.69 |
| 2026-02-18 00:00 |
12:54:38.01 |
-74:27:12.6 |
HIP 63154 |
7.63 |
| 2026-02-18 12:00 |
12:54:12.52 |
-74:28:33.5 |
HIP 63154 |
9.01 |
| 2026-02-19 00:00 |
12:53:46.78 |
-74:29:53.5 |
HIP 63154 |
10.68 |
| 2026-02-19 12:00 |
12:53:20.79 |
-74:31:12.4 |
HIP 63154 |
12.51 |
| 2026-02-20 00:00 |
12:52:54.55 |
-74:32:30.4 |
HIP 63154 |
14.45 |
| 2026-02-20 12:00 |
12:52:28.06 |
-74:33:47.3 |
HIP 63154 |
16.46 |
| 2026-02-21 00:00 |
12:52:01.33 |
-74:35:03.3 |
HIP 63154 |
18.51 |
| 2026-02-21 12:00 |
12:51:34.35 |
-74:36:18.2 |
HIP 63154 |
20.60 |
| 2026-02-22 00:00 |
12:51:07.13 |
-74:37:32.0 |
HIP 63154 |
22.71 |
| 2026-02-22 12:00 |
12:50:39.67 |
-74:38:44.9 |
HIP 63154 |
24.84 |
| 2026-02-23 00:00 |
12:50:11.98 |
-74:39:56.6 |
HIP 63154 |
26.98 |
| 2026-02-23 12:00 |
12:49:44.05 |
-74:41:07.3 |
HIP 63154 |
29.13 |
| 2026-02-24 00:00 |
12:49:15.88 |
-74:42:16.9 |
HIP 63154 |
31.30 |