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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 21:01:59.75 | +01:03:03.0 | HIP 103742 | 9.46 |
| 2026-05-12 12:00 | 21:02:10.39 | +01:07:00.6 | HIP 103742 | 12.38 |
| 2026-05-13 00:00 | 21:02:20.80 | +01:10:58.6 | HIP 103742 | 16.15 |
| 2026-05-13 12:00 | 21:02:30.99 | +01:14:56.8 | HIP 103892 | 18.78 |
| 2026-05-14 00:00 | 21:02:40.96 | +01:18:55.3 | HIP 103892 | 14.14 |
| 2026-05-14 12:00 | 21:02:50.71 | +01:22:54.0 | HIP 103892 | 9.55 |
| 2026-05-15 00:00 | 21:03:00.22 | +01:26:53.0 | HIP 103892 | 5.10 |
| 2026-05-15 12:00 | 21:03:09.51 | +01:30:52.2 | HIP 103892 | 1.92 |
| 2026-05-16 00:00 | 21:03:18.56 | +01:34:51.6 | HIP 103892 | 4.85 |
| 2026-05-16 12:00 | 21:03:27.37 | +01:38:51.3 | HIP 103893 | 6.44 |
| 2026-05-17 00:00 | 21:03:35.96 | +01:42:51.1 | HIP 103893 | 8.04 |
| 2026-05-17 12:00 | 21:03:44.30 | +01:46:51.2 | HIP 103893 | 11.30 |
| 2026-05-18 00:00 | 21:03:52.40 | +01:50:51.4 | HIP 103893 | 15.17 |
| 2026-05-18 12:00 | 21:04:00.25 | +01:54:51.8 | HIP 103893 | 19.27 |
| 2026-05-19 00:00 | 21:04:07.87 | +01:58:52.4 | HIP 104048 | 19.69 |
| 2026-05-19 12:00 | 21:04:15.23 | +02:02:53.1 | HIP 104048 | 15.29 |
| 2026-05-20 00:00 | 21:04:22.35 | +02:06:54.0 | HIP 104048 | 10.92 |
| 2026-05-20 12:00 | 21:04:29.22 | +02:10:55.0 | HIP 104048 | 6.64 |
| 2026-05-21 00:00 | 21:04:35.83 | +02:14:56.1 | HIP 104048 | 2.69 |
| 2026-05-21 12:00 | 21:04:42.19 | +02:18:57.3 | HIP 104048 | 2.87 |
| 2026-05-22 00:00 | 21:04:48.29 | +02:22:58.7 | HIP 104048 | 6.82 |
| 2026-05-22 12:00 | 21:04:54.13 | +02:27:00.1 | HIP 104048 | 11.03 |
| 2026-05-23 00:00 | 21:04:59.71 | +02:31:01.7 | HIP 104005 | 14.75 |
| 2026-05-23 12:00 | 21:05:05.03 | +02:35:03.3 | HIP 104005 | 13.41 |
| 2026-05-24 00:00 | 21:05:10.09 | +02:39:04.9 | HIP 104005 | 13.28 |
| 2026-05-24 12:00 | 21:05:14.87 | +02:43:06.6 | HIP 104005 | 14.37 |
| 2026-05-25 00:00 | 21:05:19.39 | +02:47:08.4 | HIP 104041 | 13.31 |
| 2026-05-25 12:00 | 21:05:23.64 | +02:51:10.2 | HIP 104041 | 11.78 |
| 2026-05-26 00:00 | 21:05:27.61 | +02:55:12.1 | HIP 104041 | 11.56 |
| 2026-05-26 12:00 | 21:05:31.31 | +02:59:13.9 | HIP 104041 | 12.69 |
| 2026-05-27 00:00 | 21:05:34.73 | +03:03:15.8 | HIP 104041 | 14.86 |
| 2026-05-27 12:00 | 21:05:37.87 | +03:07:17.6 | HIP 104041 | 17.69 |
| 2026-05-28 00:00 | 21:05:40.72 | +03:11:19.4 | HIP 104041 | 20.89 |
| 2026-05-28 12:00 | 21:05:43.30 | +03:15:21.2 | HIP 104047 | 22.11 |
| 2026-05-29 00:00 | 21:05:45.58 | +03:19:23.0 | HIP 104047 | 19.69 |
| 2026-05-29 12:00 | 21:05:47.57 | +03:23:24.7 | HIP 104047 | 17.81 |
| 2026-05-30 00:00 | 21:05:49.28 | +03:27:26.3 | HIP 104047 | 16.66 |
| 2026-05-30 12:00 | 21:05:50.69 | +03:31:27.8 | HIP 104047 | 16.37 |
| 2026-05-31 00:00 | 21:05:51.80 | +03:35:29.3 | HIP 104047 | 16.99 |
| 2026-05-31 12:00 | 21:05:52.61 | +03:39:30.6 | HIP 104202 | 14.62 |
| 2026-06-01 00:00 | 21:05:53.12 | +03:43:31.8 | HIP 104202 | 12.54 |
| 2026-06-01 12:00 | 21:05:53.32 | +03:47:32.9 | HIP 104202 | 11.61 |
| 2026-06-02 00:00 | 21:05:53.22 | +03:51:33.8 | HIP 104202 | 12.10 |