| Parameter |
Value |
| Designation |
C/2002 X1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-07-12T21:19:27.825600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:24Z |
| Obs used |
1432 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-21.0000000 |
| e |
0.99818758 |
| q (au) |
2.486699 |
| a (au) |
1372.033208 |
| i (deg) |
164.089428 |
| Ω (om, deg) |
281.887134 |
| ω (w, deg) |
207.325128 |
| M (ma, deg) |
359.998392 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.579 + 2.717\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.579 |
| n |
2.717 |
| gf |
1.000 |
| gb |
-0.681 |
| k |
0.995 |
| δ90 |
9.999 |
| 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 |
| 2002-02-21 |
2003-05-02 |
-0.1664 |
-0.115 |
| 2003-08-03 |
2004-01-17 |
+21.3196 |
-9.226 |
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 |
18:56:23.23 |
-22:53:53.6 |
HIP 92980 |
15.22 |
| 2026-06-01 12:00 |
18:56:20.54 |
-22:53:56.7 |
HIP 92980 |
15.28 |
| 2026-06-02 00:00 |
18:56:17.84 |
-22:53:59.7 |
HIP 92980 |
15.37 |
| 2026-06-02 12:00 |
18:56:15.13 |
-22:54:02.8 |
HIP 92980 |
15.49 |
| 2026-06-03 00:00 |
18:56:12.40 |
-22:54:05.9 |
HIP 92980 |
15.63 |
| 2026-06-03 12:00 |
18:56:09.65 |
-22:54:09.0 |
HIP 92980 |
15.79 |
| 2026-06-04 00:00 |
18:56:06.90 |
-22:54:12.1 |
HIP 92980 |
15.98 |
| 2026-06-04 12:00 |
18:56:04.13 |
-22:54:15.2 |
HIP 92931 |
16.19 |
| 2026-06-05 00:00 |
18:56:01.35 |
-22:54:18.4 |
HIP 92931 |
16.12 |
| 2026-06-05 12:00 |
18:55:58.55 |
-22:54:21.5 |
HIP 92931 |
16.07 |
| 2026-06-06 00:00 |
18:55:55.75 |
-22:54:24.7 |
HIP 92931 |
16.05 |
| 2026-06-06 12:00 |
18:55:52.93 |
-22:54:27.9 |
HIP 92931 |
16.06 |
| 2026-06-07 00:00 |
18:55:50.10 |
-22:54:31.1 |
HIP 92931 |
16.09 |
| 2026-06-07 12:00 |
18:55:47.25 |
-22:54:34.3 |
HIP 92931 |
16.15 |
| 2026-06-08 00:00 |
18:55:44.40 |
-22:54:37.5 |
HIP 92931 |
16.24 |
| 2026-06-08 12:00 |
18:55:41.53 |
-22:54:40.7 |
HIP 92931 |
16.35 |
| 2026-06-09 00:00 |
18:55:38.65 |
-22:54:43.9 |
HIP 92845 |
16.19 |
| 2026-06-09 12:00 |
18:55:35.76 |
-22:54:47.2 |
HIP 92845 |
15.95 |
| 2026-06-10 00:00 |
18:55:32.86 |
-22:54:50.5 |
HIP 92845 |
15.73 |
| 2026-06-10 12:00 |
18:55:29.95 |
-22:54:53.7 |
HIP 92845 |
15.54 |
| 2026-06-11 00:00 |
18:55:27.03 |
-22:54:57.0 |
HIP 92845 |
15.38 |
| 2026-06-11 12:00 |
18:55:24.10 |
-22:55:00.3 |
HIP 92845 |
15.24 |
| 2026-06-12 00:00 |
18:55:21.15 |
-22:55:03.6 |
HIP 92845 |
15.14 |
| 2026-06-12 12:00 |
18:55:18.20 |
-22:55:06.9 |
HIP 92845 |
15.06 |
| 2026-06-13 00:00 |
18:55:15.24 |
-22:55:10.2 |
HIP 92845 |
15.01 |
| 2026-06-13 12:00 |
18:55:12.27 |
-22:55:13.6 |
HIP 92845 |
15.00 |
| 2026-06-14 00:00 |
18:55:09.29 |
-22:55:16.9 |
HIP 92845 |
15.02 |
| 2026-06-14 12:00 |
18:55:06.30 |
-22:55:20.3 |
HIP 92845 |
15.06 |
| 2026-06-15 00:00 |
18:55:03.30 |
-22:55:23.6 |
HIP 92845 |
15.14 |
| 2026-06-15 12:00 |
18:55:00.29 |
-22:55:27.0 |
HIP 92845 |
15.25 |
| 2026-06-16 00:00 |
18:54:57.28 |
-22:55:30.3 |
HIP 92761 |
15.32 |
| 2026-06-16 12:00 |
18:54:54.25 |
-22:55:33.7 |
HIP 92761 |
14.88 |
| 2026-06-17 00:00 |
18:54:51.22 |
-22:55:37.1 |
HIP 92761 |
14.45 |
| 2026-06-17 12:00 |
18:54:48.18 |
-22:55:40.5 |
HIP 92761 |
14.05 |
| 2026-06-18 00:00 |
18:54:45.13 |
-22:55:43.9 |
HIP 92761 |
13.67 |
| 2026-06-18 12:00 |
18:54:42.08 |
-22:55:47.3 |
HIP 92761 |
13.31 |
| 2026-06-19 00:00 |
18:54:39.02 |
-22:55:50.7 |
HIP 92761 |
12.98 |
| 2026-06-19 12:00 |
18:54:35.95 |
-22:55:54.1 |
HIP 92761 |
12.69 |
| 2026-06-20 00:00 |
18:54:32.88 |
-22:55:57.5 |
HIP 92761 |
12.42 |
| 2026-06-20 12:00 |
18:54:29.80 |
-22:56:00.9 |
HIP 92761 |
12.19 |
| 2026-06-21 00:00 |
18:54:26.71 |
-22:56:04.3 |
HIP 92761 |
12.00 |
| 2026-06-21 12:00 |
18:54:23.62 |
-22:56:07.7 |
HIP 92761 |
11.85 |
| 2026-06-22 00:00 |
18:54:20.52 |
-22:56:11.2 |
HIP 92761 |
11.74 |