P/2020 G1 (Pimentel)
Metadata
| Parameter | Value |
|---|---|
| Designation | P/2020 G1 (Pimentel) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-03-17T09:47:11.889600Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:34:05Z |
| Obs used | 490 |
| NEO | Yes |
| M1 | 17.400 |
| K1 | 4.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-05-04.0000000 |
| e | 0.85961155 |
| q (au) | 0.505764 |
| a (au) | 3.602603 |
| i (deg) | 18.472732 |
| Ω (om, deg) | 240.105496 |
| ω (w, deg) | 207.637592 |
| M (ma, deg) | 6.859863 |
Magnitude
Scatter + Global Linear
$$ M_a = (17.331 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 17.331 |
| n | 2.000 |
| gf | 0.800 |
| gb | -0.696 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2020-04-13 | 2020-04-29 | +4.8811 | +0.451 |
| 2020-04-29 | 2020-05-31 | -5.2578 | +0.285 |
| 2020-05-31 | 2020-07-19 | +18.1081 | -3.892 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 20:23:37.43 | +09:18:55.7 | HIP 100704 | 21.38 |
| 2026-07-29 12:00 | 20:22:52.59 | +09:19:17.3 | HIP 100382 | 21.66 |
| 2026-07-30 00:00 | 20:22:07.49 | +09:19:34.8 | HIP 100382 | 11.48 |
| 2026-07-30 12:00 | 20:21:22.12 | +09:19:48.0 | HIP 100382 | 6.59 |
| 2026-07-31 00:00 | 20:20:36.49 | +09:19:57.1 | HIP 100382 | 14.42 |
| 2026-07-31 12:00 | 20:19:50.62 | +09:20:01.8 | HIP 100382 | 25.10 |
| 2026-08-01 00:00 | 20:19:04.50 | +09:20:02.3 | HIP 100094 | 21.72 |
| 2026-08-01 12:00 | 20:18:18.14 | +09:19:58.5 | HIP 100094 | 19.03 |
| 2026-08-02 00:00 | 20:17:31.57 | +09:19:50.3 | HIP 100094 | 22.76 |
| 2026-08-02 12:00 | 20:16:44.77 | +09:19:37.7 | HIP 99985 | 22.18 |
| 2026-08-03 00:00 | 20:15:57.77 | +09:19:20.8 | HIP 99802 | 20.85 |
| 2026-08-03 12:00 | 20:15:10.57 | +09:18:59.4 | HIP 99802 | 14.16 |
| 2026-08-04 00:00 | 20:14:23.18 | +09:18:33.6 | HIP 99802 | 15.38 |
| 2026-08-04 12:00 | 20:13:35.61 | +09:18:03.3 | HIP 99686 | 23.28 |
| 2026-08-05 00:00 | 20:12:47.86 | +09:17:28.6 | HIP 99686 | 27.41 |
| 2026-08-05 12:00 | 20:11:59.96 | +09:16:49.4 | HIP 99410 | 21.73 |
| 2026-08-06 00:00 | 20:11:11.90 | +09:16:05.7 | HIP 99410 | 11.49 |
| 2026-08-06 12:00 | 20:10:23.70 | +09:15:17.4 | HIP 99410 | 8.67 |
| 2026-08-07 00:00 | 20:09:35.38 | +09:14:24.7 | HIP 99410 | 17.46 |
| 2026-08-07 12:00 | 20:08:46.93 | +09:13:27.3 | HIP 99158 | 17.49 |
| 2026-08-08 00:00 | 20:07:58.37 | +09:12:25.5 | HIP 99158 | 11.73 |
| 2026-08-08 12:00 | 20:07:09.71 | +09:11:19.0 | HIP 99158 | 16.16 |
| 2026-08-09 00:00 | 20:06:20.96 | +09:10:08.1 | HIP 99010 | 6.52 |
| 2026-08-09 12:00 | 20:05:32.13 | +09:08:52.5 | HIP 99010 | 8.06 |
| 2026-08-10 00:00 | 20:04:43.24 | +09:07:32.4 | HIP 98862 | 7.19 |
| 2026-08-10 12:00 | 20:03:54.29 | +09:06:07.8 | HIP 98862 | 12.92 |
| 2026-08-11 00:00 | 20:03:05.30 | +09:04:38.6 | HIP 98862 | 24.09 |
| 2026-08-11 12:00 | 20:02:16.28 | +09:03:04.9 | HIP 98492 | 31.13 |
| 2026-08-12 00:00 | 20:01:27.24 | +09:01:26.6 | HIP 98487 | 22.92 |
| 2026-08-12 12:00 | 20:00:38.19 | +08:59:43.8 | HIP 98487 | 16.34 |
| 2026-08-13 00:00 | 19:59:49.14 | +08:57:56.5 | HIP 98487 | 17.50 |
| 2026-08-13 12:00 | 19:59:00.11 | +08:56:04.8 | HIP 98370 | 21.68 |
| 2026-08-14 00:00 | 19:58:11.11 | +08:54:08.6 | HIP 98250 | 16.69 |
| 2026-08-14 12:00 | 19:57:22.14 | +08:52:07.9 | HIP 98250 | 16.31 |
| 2026-08-15 00:00 | 19:56:33.23 | +08:50:02.8 | HIP 98250 | 23.50 |
| 2026-08-15 12:00 | 19:55:44.38 | +08:47:53.4 | HIP 98158 | 27.26 |
| 2026-08-16 00:00 | 19:54:55.60 | +08:45:39.6 | HIP 97938 | 20.60 |
| 2026-08-16 12:00 | 19:54:06.90 | +08:43:21.4 | HIP 97938 | 15.78 |
| 2026-08-17 00:00 | 19:53:18.30 | +08:40:59.0 | HIP 97938 | 19.28 |
| 2026-08-17 12:00 | 19:52:29.82 | +08:38:32.3 | HIP 97938 | 28.13 |
| 2026-08-18 00:00 | 19:51:41.45 | +08:36:01.3 | HIP 97649 | 20.97 |
| 2026-08-18 12:00 | 19:50:53.21 | +08:33:26.2 | HIP 97649 | 18.68 |
| 2026-08-19 00:00 | 19:50:05.11 | +08:30:46.9 | HIP 97510 | 19.73 |