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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:38:33.19 | -20:02:55.2 | HIP 86312 | 7.29 |
| 2026-09-20 12:00 | 17:38:40.44 | -20:03:20.9 | HIP 86312 | 8.93 |
| 2026-09-21 00:00 | 17:38:47.83 | -20:03:46.6 | HIP 86312 | 10.64 |
| 2026-09-21 12:00 | 17:38:55.36 | -20:04:12.2 | HIP 86312 | 12.39 |
| 2026-09-22 00:00 | 17:39:03.01 | -20:04:37.8 | HIP 86312 | 14.19 |
| 2026-09-22 12:00 | 17:39:10.79 | -20:05:03.4 | HIP 86312 | 16.02 |
| 2026-09-23 00:00 | 17:39:18.70 | -20:05:29.0 | HIP 86312 | 17.90 |
| 2026-09-23 12:00 | 17:39:26.74 | -20:05:54.6 | HIP 86312 | 19.80 |
| 2026-09-24 00:00 | 17:39:34.90 | -20:06:20.1 | HIP 86312 | 21.74 |
| 2026-09-24 12:00 | 17:39:43.20 | -20:06:45.6 | HIP 86312 | 23.71 |
| 2026-09-25 00:00 | 17:39:51.62 | -20:07:11.0 | HIP 86312 | 25.72 |
| 2026-09-25 12:00 | 17:40:00.17 | -20:07:36.5 | HIP 86312 | 27.75 |
| 2026-09-26 00:00 | 17:40:08.84 | -20:08:01.9 | HIP 86312 | 29.81 |
| 2026-09-26 12:00 | 17:40:17.64 | -20:08:27.2 | HIP 86675 | 31.69 |
| 2026-09-27 00:00 | 17:40:26.56 | -20:08:52.6 | HIP 86675 | 29.63 |
| 2026-09-27 12:00 | 17:40:35.61 | -20:09:17.9 | HIP 86675 | 27.56 |
| 2026-09-28 00:00 | 17:40:44.78 | -20:09:43.1 | HIP 86675 | 25.47 |
| 2026-09-28 12:00 | 17:40:54.07 | -20:10:08.3 | HIP 86675 | 23.38 |
| 2026-09-29 00:00 | 17:41:03.49 | -20:10:33.4 | HIP 86675 | 21.28 |
| 2026-09-29 12:00 | 17:41:13.03 | -20:10:58.5 | HIP 86675 | 19.19 |
| 2026-09-30 00:00 | 17:41:22.69 | -20:11:23.6 | HIP 86675 | 17.13 |
| 2026-09-30 12:00 | 17:41:32.47 | -20:11:48.6 | HIP 86675 | 15.10 |
| 2026-10-01 00:00 | 17:41:42.37 | -20:12:13.6 | HIP 86675 | 13.15 |
| 2026-10-01 12:00 | 17:41:52.39 | -20:12:38.4 | HIP 86675 | 11.34 |
| 2026-10-02 00:00 | 17:42:02.53 | -20:13:03.3 | HIP 86675 | 9.75 |
| 2026-10-02 12:00 | 17:42:12.79 | -20:13:28.1 | HIP 86675 | 8.54 |
| 2026-10-03 00:00 | 17:42:23.16 | -20:13:52.8 | HIP 86675 | 7.92 |
| 2026-10-03 12:00 | 17:42:33.66 | -20:14:17.4 | HIP 86675 | 8.04 |
| 2026-10-04 00:00 | 17:42:44.27 | -20:14:42.0 | HIP 86675 | 8.90 |
| 2026-10-04 12:00 | 17:42:55.00 | -20:15:06.5 | HIP 86675 | 10.33 |
| 2026-10-05 00:00 | 17:43:05.84 | -20:15:30.9 | HIP 86675 | 12.15 |
| 2026-10-05 12:00 | 17:43:16.81 | -20:15:55.3 | HIP 86675 | 14.23 |
| 2026-10-06 00:00 | 17:43:27.88 | -20:16:19.6 | HIP 86675 | 16.48 |
| 2026-10-06 12:00 | 17:43:39.07 | -20:16:43.8 | HIP 86675 | 18.85 |
| 2026-10-07 00:00 | 17:43:50.38 | -20:17:07.9 | HIP 86675 | 21.30 |
| 2026-10-07 12:00 | 17:44:01.79 | -20:17:32.0 | HIP 86926 | 23.73 |
| 2026-10-08 00:00 | 17:44:13.32 | -20:17:56.0 | HIP 86926 | 21.20 |
| 2026-10-08 12:00 | 17:44:24.97 | -20:18:19.8 | HIP 86926 | 18.71 |
| 2026-10-09 00:00 | 17:44:36.72 | -20:18:43.6 | HIP 86926 | 16.28 |
| 2026-10-09 12:00 | 17:44:48.59 | -20:19:07.3 | HIP 86926 | 13.96 |
| 2026-10-10 00:00 | 17:45:00.56 | -20:19:30.9 | HIP 86926 | 11.83 |
| 2026-10-10 12:00 | 17:45:12.65 | -20:19:54.4 | HIP 86926 | 10.04 |
| 2026-10-11 00:00 | 17:45:24.84 | -20:20:17.9 | HIP 86926 | 8.82 |