452P/Sheppard-Jewitt
Metadata
| Parameter | Value |
|---|---|
| Designation | 452P/Sheppard-Jewitt |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-04-24T04:45:31.435200Z |
| Orbit solution date (soln_date, UTC) | 2024-07-13T19:12:23Z |
| Obs used | 219 |
| NEO | - |
| M1 | 13.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2003-02-08T08:14:22.848000Z |
| Discovery magnitude (MPC) | 22.80 R |
| Discovery observatory (MPC) | 568 · Maunakea |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2016-10-12.0000000 |
| e | 0.42794873 |
| q (au) | 4.159343 |
| a (au) | 7.270927 |
| i (deg) | 6.425559 |
| Ω (om, deg) | 123.796595 |
| ω (w, deg) | 37.298698 |
| M (ma, deg) | 240.093178 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.922 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.922 |
| n | 2.000 |
| 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 |
|---|---|---|---|
| 2022-01-28 | 2023-04-18 | -25.5241 | +16.486 |
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 | 17:39:09.72 | -19:22:11.5 | HIP 86365 | 10.98 |
| 2026-07-29 12:00 | 17:39:01.98 | -19:22:29.6 | HIP 86365 | 10.12 |
| 2026-07-30 00:00 | 17:38:54.37 | -19:22:47.8 | HIP 86365 | 9.55 |
| 2026-07-30 12:00 | 17:38:46.89 | -19:23:06.1 | HIP 86365 | 9.29 |
| 2026-07-31 00:00 | 17:38:39.53 | -19:23:24.5 | HIP 86365 | 9.37 |
| 2026-07-31 12:00 | 17:38:32.30 | -19:23:43.0 | HIP 86365 | 9.75 |
| 2026-08-01 00:00 | 17:38:25.20 | -19:24:01.7 | HIP 86365 | 10.39 |
| 2026-08-01 12:00 | 17:38:18.23 | -19:24:20.5 | HIP 86365 | 11.23 |
| 2026-08-02 00:00 | 17:38:11.39 | -19:24:39.4 | HIP 86365 | 12.22 |
| 2026-08-02 12:00 | 17:38:04.68 | -19:24:58.4 | HIP 86365 | 13.31 |
| 2026-08-03 00:00 | 17:37:58.10 | -19:25:17.6 | HIP 86365 | 14.47 |
| 2026-08-03 12:00 | 17:37:51.66 | -19:25:36.8 | HIP 86365 | 15.67 |
| 2026-08-04 00:00 | 17:37:45.35 | -19:25:56.2 | HIP 86365 | 16.90 |
| 2026-08-04 12:00 | 17:37:39.17 | -19:26:15.7 | HIP 86365 | 18.15 |
| 2026-08-05 00:00 | 17:37:33.13 | -19:26:35.3 | HIP 86365 | 19.39 |
| 2026-08-05 12:00 | 17:37:27.22 | -19:26:55.1 | HIP 86365 | 20.64 |
| 2026-08-06 00:00 | 17:37:21.45 | -19:27:14.9 | HIP 86365 | 21.88 |
| 2026-08-06 12:00 | 17:37:15.82 | -19:27:34.9 | HIP 86365 | 23.10 |
| 2026-08-07 00:00 | 17:37:10.32 | -19:27:55.0 | HIP 86365 | 24.30 |
| 2026-08-07 12:00 | 17:37:04.97 | -19:28:15.2 | HIP 86365 | 25.49 |
| 2026-08-08 00:00 | 17:36:59.75 | -19:28:35.5 | HIP 86365 | 26.65 |
| 2026-08-08 12:00 | 17:36:54.67 | -19:28:56.0 | HIP 86365 | 27.80 |
| 2026-08-09 00:00 | 17:36:49.73 | -19:29:16.5 | HIP 86365 | 28.91 |
| 2026-08-09 12:00 | 17:36:44.93 | -19:29:37.2 | HIP 86365 | 30.00 |
| 2026-08-10 00:00 | 17:36:40.27 | -19:29:58.0 | HIP 86208 | 30.87 |
| 2026-08-10 12:00 | 17:36:35.76 | -19:30:18.9 | HIP 86208 | 31.40 |
| 2026-08-11 00:00 | 17:36:31.39 | -19:30:39.9 | HIP 86208 | 31.96 |
| 2026-08-11 12:00 | 17:36:27.16 | -19:31:01.0 | HIP 86208 | 32.54 |
| 2026-08-12 00:00 | 17:36:23.07 | -19:31:22.2 | HIP 86208 | 33.13 |
| 2026-08-12 12:00 | 17:36:19.13 | -19:31:43.6 | HIP 86180 | 33.19 |
| 2026-08-13 00:00 | 17:36:15.33 | -19:32:05.0 | HIP 86180 | 32.96 |
| 2026-08-13 12:00 | 17:36:11.68 | -19:32:26.6 | HIP 86180 | 32.75 |
| 2026-08-14 00:00 | 17:36:08.17 | -19:32:48.2 | HIP 86180 | 32.56 |
| 2026-08-14 12:00 | 17:36:04.81 | -19:33:10.0 | HIP 86180 | 32.38 |
| 2026-08-15 00:00 | 17:36:01.59 | -19:33:31.9 | HIP 86180 | 32.21 |
| 2026-08-15 12:00 | 17:35:58.52 | -19:33:53.8 | HIP 86180 | 32.05 |
| 2026-08-16 00:00 | 17:35:55.60 | -19:34:15.9 | HIP 86180 | 31.90 |
| 2026-08-16 12:00 | 17:35:52.82 | -19:34:38.1 | HIP 86180 | 31.76 |
| 2026-08-17 00:00 | 17:35:50.19 | -19:35:00.4 | HIP 86180 | 31.62 |
| 2026-08-17 12:00 | 17:35:47.71 | -19:35:22.7 | HIP 86180 | 31.48 |
| 2026-08-18 00:00 | 17:35:45.37 | -19:35:45.2 | HIP 86180 | 31.34 |
| 2026-08-18 12:00 | 17:35:43.19 | -19:36:07.8 | HIP 86180 | 31.19 |
| 2026-08-19 00:00 | 17:35:41.15 | -19:36:30.4 | HIP 86180 | 31.05 |