276P/Vorobjov
Metadata
| Parameter | Value |
|---|---|
| Designation | 276P/Vorobjov |
| Type | P |
| Perihelion (tp_cal, UTC) | 2024-12-12T17:38:23.265600Z |
| Orbit solution date (soln_date, UTC) | 2026-03-07T14:43:35Z |
| Obs used | 1273 |
| NEO | - |
| M1 | 11.000 |
| K1 | 7.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-02-01.0000000 |
| e | 0.26806229 |
| q (au) | 3.898225 |
| a (au) | 5.325897 |
| i (deg) | 14.811133 |
| Ω (om, deg) | 211.347487 |
| ω (w, deg) | 199.482340 |
| M (ma, deg) | 305.412530 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.496 + 3.248\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.496 |
| n | 3.248 |
| gf | 1.000 |
| gb | -0.961 |
| 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 |
|---|---|---|---|
| 2019-05-02 | 2022-09-01 | -18.6910 | +15.008 |
| 2022-09-01 | 2024-12-10 | +14.4757 | -8.653 |
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 | 08:23:00.22 | +07:00:18.9 | HIP 41129 | 13.71 |
| 2026-07-29 12:00 | 08:23:30.27 | +06:58:32.0 | HIP 41129 | 9.74 |
| 2026-07-30 00:00 | 08:24:00.29 | +06:56:44.5 | HIP 41129 | 10.91 |
| 2026-07-30 12:00 | 08:24:30.30 | +06:54:56.4 | HIP 41129 | 16.14 |
| 2026-07-31 00:00 | 08:25:00.28 | +06:53:07.7 | HIP 41129 | 22.78 |
| 2026-07-31 12:00 | 08:25:30.23 | +06:51:18.4 | HIP 41129 | 29.91 |
| 2026-08-01 00:00 | 08:26:00.17 | +06:49:28.5 | HIP 41430 | 28.05 |
| 2026-08-01 12:00 | 08:26:30.07 | +06:47:38.0 | HIP 41430 | 26.69 |
| 2026-08-02 00:00 | 08:26:59.96 | +06:45:46.9 | HIP 41550 | 20.53 |
| 2026-08-02 12:00 | 08:27:29.81 | +06:43:55.2 | HIP 41550 | 12.91 |
| 2026-08-03 00:00 | 08:27:59.65 | +06:42:03.0 | HIP 41550 | 5.37 |
| 2026-08-03 12:00 | 08:28:29.45 | +06:40:10.1 | HIP 41550 | 2.77 |
| 2026-08-04 00:00 | 08:28:59.23 | +06:38:16.7 | HIP 41550 | 10.15 |
| 2026-08-04 12:00 | 08:29:28.98 | +06:36:22.7 | HIP 41550 | 17.75 |
| 2026-08-05 00:00 | 08:29:58.70 | +06:34:28.1 | HIP 41550 | 25.36 |
| 2026-08-05 12:00 | 08:30:28.39 | +06:32:33.0 | HIP 41786 | 29.90 |
| 2026-08-06 00:00 | 08:30:58.06 | +06:30:37.3 | HIP 41786 | 29.97 |
| 2026-08-06 12:00 | 08:31:27.70 | +06:28:41.0 | HIP 41786 | 31.93 |
| 2026-08-07 00:00 | 08:31:57.30 | +06:26:44.2 | HIP 41786 | 35.44 |
| 2026-08-07 12:00 | 08:32:26.87 | +06:24:46.8 | HIP 41786 | 40.12 |
| 2026-08-08 00:00 | 08:32:56.42 | +06:22:48.8 | HIP 41898 | 40.05 |
| 2026-08-08 12:00 | 08:33:25.93 | +06:20:50.3 | HIP 42172 | 39.60 |
| 2026-08-09 00:00 | 08:33:55.41 | +06:18:51.2 | HIP 42172 | 34.10 |
| 2026-08-09 12:00 | 08:34:24.85 | +06:16:51.6 | HIP 42172 | 29.56 |
| 2026-08-10 00:00 | 08:34:54.26 | +06:14:51.5 | HIP 42172 | 26.45 |
| 2026-08-10 12:00 | 08:35:23.64 | +06:12:50.8 | HIP 42172 | 25.32 |
| 2026-08-11 00:00 | 08:35:52.98 | +06:10:49.5 | HIP 42283 | 23.71 |
| 2026-08-11 12:00 | 08:36:22.29 | +06:08:47.8 | HIP 42283 | 16.43 |
| 2026-08-12 00:00 | 08:36:51.56 | +06:06:45.5 | HIP 42283 | 9.60 |
| 2026-08-12 12:00 | 08:37:20.79 | +06:04:42.7 | HIP 42283 | 5.33 |
| 2026-08-13 00:00 | 08:37:49.98 | +06:02:39.3 | HIP 42283 | 8.86 |
| 2026-08-13 12:00 | 08:38:19.14 | +06:00:35.5 | HIP 42283 | 15.56 |
| 2026-08-14 00:00 | 08:38:48.25 | +05:58:31.1 | HIP 42491 | 18.60 |
| 2026-08-14 12:00 | 08:39:17.33 | +05:56:26.3 | HIP 42491 | 12.21 |
| 2026-08-15 00:00 | 08:39:46.37 | +05:54:20.9 | HIP 42491 | 8.08 |
| 2026-08-15 12:00 | 08:40:15.36 | +05:52:15.0 | HIP 42491 | 9.71 |
| 2026-08-16 00:00 | 08:40:44.31 | +05:50:08.7 | HIP 42491 | 15.35 |
| 2026-08-16 12:00 | 08:41:13.22 | +05:48:01.8 | HIP 42491 | 22.12 |
| 2026-08-17 00:00 | 08:41:42.09 | +05:45:54.5 | HIP 42635 | 23.58 |
| 2026-08-17 12:00 | 08:42:10.91 | +05:43:46.7 | HIP 42635 | 24.43 |
| 2026-08-18 00:00 | 08:42:39.69 | +05:41:38.4 | HIP 42804 | 27.22 |
| 2026-08-18 12:00 | 08:43:08.42 | +05:39:29.7 | HIP 42804 | 23.61 |
| 2026-08-19 00:00 | 08:43:37.11 | +05:37:20.5 | HIP 42931 | 21.23 |