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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 09:12:13.90 | +03:06:19.8 | HIP 45163 | 4.03 |
| 2026-09-20 12:00 | 09:12:38.42 | +03:03:49.1 | HIP 45163 | 10.52 |
| 2026-09-21 00:00 | 09:13:02.86 | +03:01:18.3 | HIP 45299 | 16.04 |
| 2026-09-21 12:00 | 09:13:27.21 | +02:58:47.2 | HIP 45299 | 9.79 |
| 2026-09-22 00:00 | 09:13:51.48 | +02:56:16.0 | HIP 45299 | 4.56 |
| 2026-09-22 12:00 | 09:14:15.66 | +02:53:44.7 | HIP 45299 | 5.63 |
| 2026-09-23 00:00 | 09:14:39.75 | +02:51:13.2 | HIP 45299 | 11.30 |
| 2026-09-23 12:00 | 09:15:03.75 | +02:48:41.6 | HIP 45299 | 17.55 |
| 2026-09-24 00:00 | 09:15:27.66 | +02:46:09.8 | HIP 45464 | 14.46 |
| 2026-09-24 12:00 | 09:15:51.49 | +02:43:37.9 | HIP 45464 | 10.37 |
| 2026-09-25 00:00 | 09:16:15.23 | +02:41:05.9 | HIP 45464 | 9.47 |
| 2026-09-25 12:00 | 09:16:38.87 | +02:38:33.8 | HIP 45564 | 8.55 |
| 2026-09-26 00:00 | 09:17:02.42 | +02:36:01.5 | HIP 45564 | 5.27 |
| 2026-09-26 12:00 | 09:17:25.89 | +02:33:29.1 | HIP 45564 | 8.02 |
| 2026-09-27 00:00 | 09:17:49.26 | +02:30:56.7 | HIP 45564 | 13.50 |
| 2026-09-27 12:00 | 09:18:12.54 | +02:28:24.1 | HIP 45564 | 19.50 |
| 2026-09-28 00:00 | 09:18:35.72 | +02:25:51.4 | HIP 45564 | 25.65 |
| 2026-09-28 12:00 | 09:18:58.81 | +02:23:18.6 | HIP 45564 | 31.86 |
| 2026-09-29 00:00 | 09:19:21.80 | +02:20:45.8 | HIP 45564 | 38.07 |
| 2026-09-29 12:00 | 09:19:44.70 | +02:18:12.8 | HIP 45929 | 41.47 |
| 2026-09-30 00:00 | 09:20:07.51 | +02:15:39.8 | HIP 45929 | 35.47 |
| 2026-09-30 12:00 | 09:20:30.22 | +02:13:06.7 | HIP 45929 | 29.60 |
| 2026-10-01 00:00 | 09:20:52.83 | +02:10:33.5 | HIP 45929 | 23.92 |
| 2026-10-01 12:00 | 09:21:15.34 | +02:08:00.3 | HIP 45929 | 18.59 |
| 2026-10-02 00:00 | 09:21:37.75 | +02:05:27.0 | HIP 45929 | 13.97 |
| 2026-10-02 12:00 | 09:22:00.06 | +02:02:53.7 | HIP 45929 | 10.98 |
| 2026-10-03 00:00 | 09:22:22.27 | +02:00:20.3 | HIP 45967 | 8.21 |
| 2026-10-03 12:00 | 09:22:44.38 | +01:57:46.9 | HIP 45967 | 6.69 |
| 2026-10-04 00:00 | 09:23:06.39 | +01:55:13.5 | HIP 45967 | 9.78 |
| 2026-10-04 12:00 | 09:23:28.30 | +01:52:40.0 | HIP 45967 | 14.81 |
| 2026-10-05 00:00 | 09:23:50.10 | +01:50:06.6 | HIP 45967 | 20.37 |
| 2026-10-05 12:00 | 09:24:11.80 | +01:47:33.1 | HIP 46164 | 20.21 |
| 2026-10-06 00:00 | 09:24:33.39 | +01:44:59.6 | HIP 46164 | 15.61 |
| 2026-10-06 12:00 | 09:24:54.87 | +01:42:26.1 | HIP 46164 | 12.27 |
| 2026-10-07 00:00 | 09:25:16.25 | +01:39:52.6 | HIP 46164 | 11.30 |
| 2026-10-07 12:00 | 09:25:37.52 | +01:37:19.1 | HIP 46164 | 13.21 |
| 2026-10-08 00:00 | 09:25:58.68 | +01:34:45.7 | HIP 46164 | 17.02 |
| 2026-10-08 12:00 | 09:26:19.73 | +01:32:12.3 | HIP 46366 | 19.55 |
| 2026-10-09 00:00 | 09:26:40.67 | +01:29:38.9 | HIP 46366 | 14.17 |
| 2026-10-09 12:00 | 09:27:01.50 | +01:27:05.6 | HIP 46366 | 9.36 |
| 2026-10-10 00:00 | 09:27:22.21 | +01:24:32.4 | HIP 46366 | 6.44 |
| 2026-10-10 12:00 | 09:27:42.81 | +01:21:59.2 | HIP 46366 | 7.85 |
| 2026-10-11 00:00 | 09:28:03.30 | +01:19:26.0 | HIP 46366 | 12.13 |