C/2002 V1 (NEAT)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2002 V1 (NEAT) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2003-02-18T07:05:52.609920Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:22Z |
| Obs used | 1510 |
| NEO | - |
| M1 | 10.400 |
| K1 | 14.250 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2002-12-26.0000000 |
| e | 0.99990177 |
| q (au) | 0.099258 |
| a (au) | 1010.516972 |
| i (deg) | 81.706057 |
| Ω (om, deg) | 64.088430 |
| ω (w, deg) | 152.169686 |
| M (ma, deg) | 359.998334 |
Magnitude
Scatter + Global Linear
$$ M_a = (8.600 + 5.819\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 8.600 |
| n | 5.819 |
| gf | 0.800 |
| 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 |
|---|---|---|---|
| 2002-11-06 | 2003-01-09 | +8.2411 | -1.967 |
| 2003-01-09 | 2003-02-16 | -4.0411 | -0.415 |
| 2003-02-18 | 2003-03-14 | -5.0184 | -2.415 |
| 2003-03-14 | 2003-10-22 | +0.7169 | -2.971 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 04:12:34.24 | -11:28:45.2 | HIP 19678 | 22.04 |
| 2026-05-12 12:00 | 04:12:36.70 | -11:28:34.2 | HIP 19678 | 21.72 |
| 2026-05-13 00:00 | 04:12:39.16 | -11:28:23.3 | HIP 19678 | 21.42 |
| 2026-05-13 12:00 | 04:12:41.63 | -11:28:12.6 | HIP 19678 | 21.14 |
| 2026-05-14 00:00 | 04:12:44.10 | -11:28:02.1 | HIP 19678 | 20.87 |
| 2026-05-14 12:00 | 04:12:46.57 | -11:27:51.7 | HIP 19678 | 20.62 |
| 2026-05-15 00:00 | 04:12:49.05 | -11:27:41.5 | HIP 19678 | 20.38 |
| 2026-05-15 12:00 | 04:12:51.53 | -11:27:31.4 | HIP 19678 | 20.17 |
| 2026-05-16 00:00 | 04:12:54.02 | -11:27:21.5 | HIP 19678 | 19.98 |
| 2026-05-16 12:00 | 04:12:56.51 | -11:27:11.8 | HIP 19678 | 19.81 |
| 2026-05-17 00:00 | 04:12:59.00 | -11:27:02.2 | HIP 19678 | 19.66 |
| 2026-05-17 12:00 | 04:13:01.50 | -11:26:52.8 | HIP 19678 | 19.54 |
| 2026-05-18 00:00 | 04:13:04.00 | -11:26:43.6 | HIP 19678 | 19.43 |
| 2026-05-18 12:00 | 04:13:06.50 | -11:26:34.5 | HIP 19678 | 19.35 |
| 2026-05-19 00:00 | 04:13:09.01 | -11:26:25.6 | HIP 19678 | 19.29 |
| 2026-05-19 12:00 | 04:13:11.52 | -11:26:16.8 | HIP 19678 | 19.26 |
| 2026-05-20 00:00 | 04:13:14.03 | -11:26:08.3 | HIP 19678 | 19.25 |
| 2026-05-20 12:00 | 04:13:16.54 | -11:25:59.8 | HIP 19678 | 19.26 |
| 2026-05-21 00:00 | 04:13:19.05 | -11:25:51.6 | HIP 19678 | 19.30 |
| 2026-05-21 12:00 | 04:13:21.57 | -11:25:43.5 | HIP 19678 | 19.36 |
| 2026-05-22 00:00 | 04:13:24.09 | -11:25:35.6 | HIP 19678 | 19.44 |
| 2026-05-22 12:00 | 04:13:26.61 | -11:25:27.9 | HIP 19678 | 19.55 |
| 2026-05-23 00:00 | 04:13:29.13 | -11:25:20.3 | HIP 19678 | 19.67 |
| 2026-05-23 12:00 | 04:13:31.65 | -11:25:12.9 | HIP 19678 | 19.82 |
| 2026-05-24 00:00 | 04:13:34.17 | -11:25:05.7 | HIP 19678 | 19.99 |
| 2026-05-24 12:00 | 04:13:36.70 | -11:24:58.6 | HIP 19678 | 20.19 |
| 2026-05-25 00:00 | 04:13:39.22 | -11:24:51.7 | HIP 19678 | 20.40 |
| 2026-05-25 12:00 | 04:13:41.74 | -11:24:45.0 | HIP 19678 | 20.63 |
| 2026-05-26 00:00 | 04:13:44.27 | -11:24:38.4 | HIP 19678 | 20.88 |
| 2026-05-26 12:00 | 04:13:46.79 | -11:24:32.0 | HIP 19678 | 21.15 |
| 2026-05-27 00:00 | 04:13:49.32 | -11:24:25.8 | HIP 19678 | 21.43 |
| 2026-05-27 12:00 | 04:13:51.84 | -11:24:19.8 | HIP 19678 | 21.74 |
| 2026-05-28 00:00 | 04:13:54.37 | -11:24:13.9 | HIP 19678 | 22.05 |
| 2026-05-28 12:00 | 04:13:56.89 | -11:24:08.2 | HIP 19678 | 22.39 |
| 2026-05-29 00:00 | 04:13:59.41 | -11:24:02.7 | HIP 19678 | 22.73 |
| 2026-05-29 12:00 | 04:14:01.93 | -11:23:57.3 | HIP 19678 | 23.10 |
| 2026-05-30 00:00 | 04:14:04.45 | -11:23:52.1 | HIP 19678 | 23.47 |
| 2026-05-30 12:00 | 04:14:06.97 | -11:23:47.1 | HIP 19678 | 23.86 |
| 2026-05-31 00:00 | 04:14:09.49 | -11:23:42.3 | HIP 19678 | 24.25 |
| 2026-05-31 12:00 | 04:14:12.01 | -11:23:37.6 | HIP 19678 | 24.66 |
| 2026-06-01 00:00 | 04:14:14.52 | -11:23:33.1 | HIP 19678 | 25.08 |
| 2026-06-01 12:00 | 04:14:17.04 | -11:23:28.8 | HIP 19678 | 25.51 |
| 2026-06-02 00:00 | 04:14:19.55 | -11:23:24.7 | HIP 19678 | 25.95 |