C/2002 X5 (Kudo-Fujikawa)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2002 X5 (Kudo-Fujikawa) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2003-01-29T00:03:18.599040Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:24Z |
| Obs used | 514 |
| NEO | - |
| M1 | 10.600 |
| K1 | 11.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2003-01-20.0000000 |
| e | 0.99984090 |
| q (au) | 0.189934 |
| a (au) | 1193.800858 |
| i (deg) | 94.152279 |
| Ω (om, deg) | 119.065024 |
| ω (w, deg) | 187.584474 |
| M (ma, deg) | 359.999785 |
Magnitude
Scatter + Global Linear
$$ M_a = (7.886 + 4.159\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 7.886 |
| n | 4.159 |
| 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 |
|---|---|---|---|
| 2002-12-14 | 2002-12-23 | +17.1755 | -0.401 |
| 2002-12-23 | 2002-12-31 | -8.3536 | +0.041 |
| 2002-12-31 | 2003-01-19 | -3.8086 | -0.506 |
| 2003-02-07 | 2003-02-20 | -3.9273 | +0.459 |
| 2003-02-20 | 2003-02-27 | -12.3277 | -0.141 |
| 2003-02-27 | 2003-03-18 | -7.0995 | +0.825 |
| 2003-03-18 | 2003-03-31 | +6.6412 | -0.016 |
| 2003-03-31 | 2003-04-22 | +52.0092 | -8.310 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 08:00:57.58 | +20:48:42.6 | HIP 39064 | 19.67 |
| 2026-06-01 12:00 | 08:00:59.35 | +20:48:37.9 | HIP 39064 | 20.09 |
| 2026-06-02 00:00 | 08:01:01.13 | +20:48:33.2 | HIP 39064 | 20.52 |
| 2026-06-02 12:00 | 08:01:02.93 | +20:48:28.4 | HIP 39064 | 20.94 |
| 2026-06-03 00:00 | 08:01:04.75 | +20:48:23.6 | HIP 39064 | 21.37 |
| 2026-06-03 12:00 | 08:01:06.58 | +20:48:18.8 | HIP 39064 | 21.81 |
| 2026-06-04 00:00 | 08:01:08.42 | +20:48:13.9 | HIP 39064 | 22.24 |
| 2026-06-04 12:00 | 08:01:10.28 | +20:48:08.9 | HIP 39260 | 22.60 |
| 2026-06-05 00:00 | 08:01:12.16 | +20:48:03.9 | HIP 39260 | 22.37 |
| 2026-06-05 12:00 | 08:01:14.05 | +20:47:58.9 | HIP 39260 | 22.16 |
| 2026-06-06 00:00 | 08:01:15.95 | +20:47:53.8 | HIP 39260 | 21.95 |
| 2026-06-06 12:00 | 08:01:17.87 | +20:47:48.7 | HIP 39260 | 21.74 |
| 2026-06-07 00:00 | 08:01:19.81 | +20:47:43.6 | HIP 39260 | 21.55 |
| 2026-06-07 12:00 | 08:01:21.76 | +20:47:38.4 | HIP 39260 | 21.36 |
| 2026-06-08 00:00 | 08:01:23.72 | +20:47:33.1 | HIP 39260 | 21.17 |
| 2026-06-08 12:00 | 08:01:25.70 | +20:47:27.9 | HIP 39260 | 20.99 |
| 2026-06-09 00:00 | 08:01:27.69 | +20:47:22.5 | HIP 39260 | 20.83 |
| 2026-06-09 12:00 | 08:01:29.69 | +20:47:17.2 | HIP 39260 | 20.66 |
| 2026-06-10 00:00 | 08:01:31.71 | +20:47:11.8 | HIP 39260 | 20.51 |
| 2026-06-10 12:00 | 08:01:33.74 | +20:47:06.3 | HIP 39260 | 20.37 |
| 2026-06-11 00:00 | 08:01:35.79 | +20:47:00.9 | HIP 39260 | 20.24 |
| 2026-06-11 12:00 | 08:01:37.85 | +20:46:55.3 | HIP 39260 | 20.12 |
| 2026-06-12 00:00 | 08:01:39.92 | +20:46:49.8 | HIP 39260 | 20.00 |
| 2026-06-12 12:00 | 08:01:42.01 | +20:46:44.2 | HIP 39260 | 19.90 |
| 2026-06-13 00:00 | 08:01:44.10 | +20:46:38.6 | HIP 39260 | 19.81 |
| 2026-06-13 12:00 | 08:01:46.21 | +20:46:32.9 | HIP 39260 | 19.73 |
| 2026-06-14 00:00 | 08:01:48.34 | +20:46:27.2 | HIP 39260 | 19.67 |
| 2026-06-14 12:00 | 08:01:50.47 | +20:46:21.4 | HIP 39260 | 19.62 |
| 2026-06-15 00:00 | 08:01:52.62 | +20:46:15.6 | HIP 39260 | 19.57 |
| 2026-06-15 12:00 | 08:01:54.78 | +20:46:09.8 | HIP 39260 | 19.55 |
| 2026-06-16 00:00 | 08:01:56.95 | +20:46:04.0 | HIP 39260 | 19.53 |
| 2026-06-16 12:00 | 08:01:59.14 | +20:45:58.1 | HIP 39260 | 19.53 |
| 2026-06-17 00:00 | 08:02:01.33 | +20:45:52.2 | HIP 39260 | 19.55 |
| 2026-06-17 12:00 | 08:02:03.54 | +20:45:46.2 | HIP 39260 | 19.57 |
| 2026-06-18 00:00 | 08:02:05.76 | +20:45:40.2 | HIP 39260 | 19.62 |
| 2026-06-18 12:00 | 08:02:07.98 | +20:45:34.2 | HIP 39260 | 19.67 |
| 2026-06-19 00:00 | 08:02:10.22 | +20:45:28.2 | HIP 39260 | 19.74 |
| 2026-06-19 12:00 | 08:02:12.47 | +20:45:22.1 | HIP 39260 | 19.83 |
| 2026-06-20 00:00 | 08:02:14.73 | +20:45:16.0 | HIP 39260 | 19.93 |
| 2026-06-20 12:00 | 08:02:17.01 | +20:45:09.8 | HIP 39260 | 20.04 |
| 2026-06-21 00:00 | 08:02:19.29 | +20:45:03.6 | HIP 39260 | 20.17 |
| 2026-06-21 12:00 | 08:02:21.58 | +20:44:57.4 | HIP 39260 | 20.32 |
| 2026-06-22 00:00 | 08:02:23.88 | +20:44:51.2 | HIP 39260 | 20.47 |