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 | -0.998 |
| 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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 08:00:03.10 | +20:50:29.0 | HIP 39064 | 6.84 |
| 2026-03-26 12:00 | 08:00:02.01 | +20:50:32.5 | HIP 39064 | 6.59 |
| 2026-03-27 00:00 | 08:00:00.95 | +20:50:35.9 | HIP 39064 | 6.34 |
| 2026-03-27 12:00 | 07:59:59.91 | +20:50:39.2 | HIP 39064 | 6.09 |
| 2026-03-28 00:00 | 07:59:58.89 | +20:50:42.5 | HIP 39064 | 5.86 |
| 2026-03-28 12:00 | 07:59:57.89 | +20:50:45.7 | HIP 39064 | 5.62 |
| 2026-03-29 00:00 | 07:59:56.92 | +20:50:48.9 | HIP 39064 | 5.40 |
| 2026-03-29 12:00 | 07:59:55.97 | +20:50:51.9 | HIP 39064 | 5.18 |
| 2026-03-30 00:00 | 07:59:55.04 | +20:50:55.0 | HIP 39064 | 4.96 |
| 2026-03-30 12:00 | 07:59:54.13 | +20:50:57.9 | HIP 39064 | 4.75 |
| 2026-03-31 00:00 | 07:59:53.25 | +20:51:00.8 | HIP 39064 | 4.55 |
| 2026-03-31 12:00 | 07:59:52.39 | +20:51:03.6 | HIP 39064 | 4.35 |
| 2026-04-01 00:00 | 07:59:51.55 | +20:51:06.4 | HIP 39064 | 4.16 |
| 2026-04-01 12:00 | 07:59:50.74 | +20:51:09.0 | HIP 39064 | 3.98 |
| 2026-04-02 00:00 | 07:59:49.94 | +20:51:11.7 | HIP 39064 | 3.80 |
| 2026-04-02 12:00 | 07:59:49.18 | +20:51:14.2 | HIP 39064 | 3.63 |
| 2026-04-03 00:00 | 07:59:48.43 | +20:51:16.7 | HIP 39064 | 3.46 |
| 2026-04-03 12:00 | 07:59:47.71 | +20:51:19.1 | HIP 39064 | 3.30 |
| 2026-04-04 00:00 | 07:59:47.01 | +20:51:21.5 | HIP 39064 | 3.15 |
| 2026-04-04 12:00 | 07:59:46.33 | +20:51:23.8 | HIP 39064 | 3.00 |
| 2026-04-05 00:00 | 07:59:45.68 | +20:51:26.0 | HIP 39064 | 2.86 |
| 2026-04-05 12:00 | 07:59:45.05 | +20:51:28.1 | HIP 39064 | 2.73 |
| 2026-04-06 00:00 | 07:59:44.44 | +20:51:30.2 | HIP 39064 | 2.60 |
| 2026-04-06 12:00 | 07:59:43.85 | +20:51:32.2 | HIP 39064 | 2.48 |
| 2026-04-07 00:00 | 07:59:43.29 | +20:51:34.2 | HIP 39064 | 2.37 |
| 2026-04-07 12:00 | 07:59:42.76 | +20:51:36.1 | HIP 39064 | 2.27 |
| 2026-04-08 00:00 | 07:59:42.24 | +20:51:37.9 | HIP 39064 | 2.17 |
| 2026-04-08 12:00 | 07:59:41.75 | +20:51:39.7 | HIP 39064 | 2.08 |
| 2026-04-09 00:00 | 07:59:41.28 | +20:51:41.4 | HIP 39064 | 2.00 |
| 2026-04-09 12:00 | 07:59:40.84 | +20:51:43.0 | HIP 39064 | 1.92 |
| 2026-04-10 00:00 | 07:59:40.42 | +20:51:44.6 | HIP 39064 | 1.85 |
| 2026-04-10 12:00 | 07:59:40.02 | +20:51:46.1 | HIP 39064 | 1.79 |
| 2026-04-11 00:00 | 07:59:39.64 | +20:51:47.5 | HIP 39064 | 1.74 |
| 2026-04-11 12:00 | 07:59:39.29 | +20:51:48.8 | HIP 39064 | 1.69 |
| 2026-04-12 00:00 | 07:59:38.96 | +20:51:50.1 | HIP 39064 | 1.64 |
| 2026-04-12 12:00 | 07:59:38.66 | +20:51:51.4 | HIP 39064 | 1.61 |
| 2026-04-13 00:00 | 07:59:38.38 | +20:51:52.5 | HIP 39064 | 1.58 |
| 2026-04-13 12:00 | 07:59:38.12 | +20:51:53.6 | HIP 39064 | 1.55 |
| 2026-04-14 00:00 | 07:59:37.89 | +20:51:54.6 | HIP 39064 | 1.53 |
| 2026-04-14 12:00 | 07:59:37.68 | +20:51:55.6 | HIP 39064 | 1.51 |
| 2026-04-15 00:00 | 07:59:37.49 | +20:51:56.5 | HIP 39064 | 1.50 |
| 2026-04-15 12:00 | 07:59:37.33 | +20:51:57.3 | HIP 39064 | 1.49 |
| 2026-04-16 00:00 | 07:59:37.18 | +20:51:58.1 | HIP 39064 | 1.48 |