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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 18:02:20.00 | -19:01:23.6 | HIP 88297 | 8.23 |
| 2026-06-01 12:00 | 18:02:07.72 | -19:01:27.0 | HIP 88297 | 6.12 |
| 2026-06-02 00:00 | 18:01:55.37 | -19:01:30.5 | HIP 88297 | 4.91 |
| 2026-06-02 12:00 | 18:01:42.95 | -19:01:34.2 | HIP 88297 | 5.28 |
| 2026-06-03 00:00 | 18:01:30.48 | -19:01:38.0 | HIP 88297 | 7.00 |
| 2026-06-03 12:00 | 18:01:17.94 | -19:01:41.9 | HIP 88297 | 9.36 |
| 2026-06-04 00:00 | 18:01:05.34 | -19:01:45.9 | HIP 88297 | 12.01 |
| 2026-06-04 12:00 | 18:00:52.68 | -19:01:50.1 | HIP 88167 | 13.72 |
| 2026-06-05 00:00 | 18:00:39.97 | -19:01:54.5 | HIP 88167 | 12.48 |
| 2026-06-05 12:00 | 18:00:27.20 | -19:01:58.9 | HIP 88167 | 11.89 |
| 2026-06-06 00:00 | 18:00:14.39 | -19:02:03.5 | HIP 88167 | 12.05 |
| 2026-06-06 12:00 | 18:00:01.52 | -19:02:08.3 | HIP 88167 | 12.94 |
| 2026-06-07 00:00 | 17:59:48.60 | -19:02:13.1 | HIP 88167 | 14.43 |
| 2026-06-07 12:00 | 17:59:35.63 | -19:02:18.1 | HIP 88167 | 16.37 |
| 2026-06-08 00:00 | 17:59:22.63 | -19:02:23.2 | HIP 88167 | 18.62 |
| 2026-06-08 12:00 | 17:59:09.57 | -19:02:28.5 | HIP 88167 | 21.09 |
| 2026-06-09 00:00 | 17:58:56.48 | -19:02:33.9 | HIP 88167 | 23.71 |
| 2026-06-09 12:00 | 17:58:43.35 | -19:02:39.4 | HIP 87881 | 22.70 |
| 2026-06-10 00:00 | 17:58:30.17 | -19:02:45.1 | HIP 87881 | 19.61 |
| 2026-06-10 12:00 | 17:58:16.97 | -19:02:50.8 | HIP 87881 | 16.51 |
| 2026-06-11 00:00 | 17:58:03.73 | -19:02:56.8 | HIP 87881 | 13.42 |
| 2026-06-11 12:00 | 17:57:50.46 | -19:03:02.8 | HIP 87881 | 10.34 |
| 2026-06-12 00:00 | 17:57:37.16 | -19:03:09.0 | HIP 87881 | 7.31 |
| 2026-06-12 12:00 | 17:57:23.83 | -19:03:15.3 | HIP 87881 | 4.43 |
| 2026-06-13 00:00 | 17:57:10.47 | -19:03:21.7 | HIP 87881 | 2.40 |
| 2026-06-13 12:00 | 17:56:57.10 | -19:03:28.3 | HIP 87881 | 3.44 |
| 2026-06-14 00:00 | 17:56:43.70 | -19:03:35.0 | HIP 87832 | 3.24 |
| 2026-06-14 12:00 | 17:56:30.28 | -19:03:41.8 | HIP 87832 | 2.82 |
| 2026-06-15 00:00 | 17:56:16.84 | -19:03:48.8 | HIP 87832 | 5.06 |
| 2026-06-15 12:00 | 17:56:03.39 | -19:03:55.9 | HIP 87832 | 7.97 |
| 2026-06-16 00:00 | 17:55:49.93 | -19:04:03.1 | HIP 87832 | 11.04 |
| 2026-06-16 12:00 | 17:55:36.46 | -19:04:10.5 | HIP 87832 | 14.16 |
| 2026-06-17 00:00 | 17:55:22.97 | -19:04:18.0 | HIP 87832 | 17.30 |
| 2026-06-17 12:00 | 17:55:09.49 | -19:04:25.6 | HIP 87782 | 19.53 |
| 2026-06-18 00:00 | 17:54:55.99 | -19:04:33.3 | HIP 87782 | 21.55 |
| 2026-06-18 12:00 | 17:54:42.50 | -19:04:41.2 | HIP 87568 | 22.59 |
| 2026-06-19 00:00 | 17:54:29.00 | -19:04:49.2 | HIP 87568 | 20.05 |
| 2026-06-19 12:00 | 17:54:15.51 | -19:04:57.3 | HIP 87568 | 17.73 |
| 2026-06-20 00:00 | 17:54:02.02 | -19:05:05.5 | HIP 87568 | 15.72 |
| 2026-06-20 12:00 | 17:53:48.54 | -19:05:13.9 | HIP 87568 | 14.15 |
| 2026-06-21 00:00 | 17:53:35.06 | -19:05:22.4 | HIP 87568 | 13.19 |
| 2026-06-21 12:00 | 17:53:21.60 | -19:05:31.0 | HIP 87568 | 12.96 |
| 2026-06-22 00:00 | 17:53:08.14 | -19:05:39.8 | HIP 87568 | 13.50 |