| Parameter |
Value |
| Designation |
C/2004 X2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-08-24T08:00:06.079680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:45Z |
| Obs used |
252 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-01-15.0000000 |
| e |
0.99737720 |
| q (au) |
3.793087 |
| a (au) |
1446.194953 |
| i (deg) |
72.117890 |
| Ω (om, deg) |
307.341187 |
| ω (w, deg) |
162.215319 |
| M (ma, deg) |
0.002575 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.808 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.808 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.783 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:21:18.13 |
-72:04:04.2 |
HIP 100457 |
11.17 |
| 2026-06-01 12:00 |
20:21:12.57 |
-72:04:32.8 |
HIP 100457 |
10.92 |
| 2026-06-02 00:00 |
20:21:06.94 |
-72:05:01.3 |
HIP 100457 |
10.70 |
| 2026-06-02 12:00 |
20:21:01.25 |
-72:05:29.6 |
HIP 100457 |
10.52 |
| 2026-06-03 00:00 |
20:20:55.49 |
-72:05:57.8 |
HIP 100457 |
10.39 |
| 2026-06-03 12:00 |
20:20:49.67 |
-72:06:25.8 |
HIP 100457 |
10.30 |
| 2026-06-04 00:00 |
20:20:43.78 |
-72:06:53.7 |
HIP 100457 |
10.25 |
| 2026-06-04 12:00 |
20:20:37.82 |
-72:07:21.4 |
HIP 100457 |
10.25 |
| 2026-06-05 00:00 |
20:20:31.80 |
-72:07:48.9 |
HIP 100457 |
10.30 |
| 2026-06-05 12:00 |
20:20:25.71 |
-72:08:16.3 |
HIP 100457 |
10.39 |
| 2026-06-06 00:00 |
20:20:19.56 |
-72:08:43.5 |
HIP 100457 |
10.53 |
| 2026-06-06 12:00 |
20:20:13.34 |
-72:09:10.6 |
HIP 100457 |
10.71 |
| 2026-06-07 00:00 |
20:20:07.06 |
-72:09:37.4 |
HIP 100457 |
10.93 |
| 2026-06-07 12:00 |
20:20:00.71 |
-72:10:04.1 |
HIP 100457 |
11.19 |
| 2026-06-08 00:00 |
20:19:54.31 |
-72:10:30.6 |
HIP 100457 |
11.49 |
| 2026-06-08 12:00 |
20:19:47.84 |
-72:10:57.0 |
HIP 100457 |
11.83 |
| 2026-06-09 00:00 |
20:19:41.31 |
-72:11:23.1 |
HIP 100457 |
12.19 |
| 2026-06-09 12:00 |
20:19:34.71 |
-72:11:49.1 |
HIP 99973 |
12.11 |
| 2026-06-10 00:00 |
20:19:28.06 |
-72:12:14.9 |
HIP 99973 |
11.63 |
| 2026-06-10 12:00 |
20:19:21.34 |
-72:12:40.5 |
HIP 99973 |
11.17 |
| 2026-06-11 00:00 |
20:19:14.57 |
-72:13:05.8 |
HIP 99973 |
10.73 |
| 2026-06-11 12:00 |
20:19:07.73 |
-72:13:31.0 |
HIP 99973 |
10.31 |
| 2026-06-12 00:00 |
20:19:00.84 |
-72:13:56.0 |
HIP 99973 |
9.91 |
| 2026-06-12 12:00 |
20:18:53.88 |
-72:14:20.8 |
HIP 99973 |
9.53 |
| 2026-06-13 00:00 |
20:18:46.87 |
-72:14:45.4 |
HIP 99973 |
9.19 |
| 2026-06-13 12:00 |
20:18:39.80 |
-72:15:09.8 |
HIP 99973 |
8.88 |
| 2026-06-14 00:00 |
20:18:32.67 |
-72:15:34.0 |
HIP 99973 |
8.60 |
| 2026-06-14 12:00 |
20:18:25.49 |
-72:15:58.0 |
HIP 99973 |
8.36 |
| 2026-06-15 00:00 |
20:18:18.25 |
-72:16:21.7 |
HIP 99973 |
8.17 |
| 2026-06-15 12:00 |
20:18:10.95 |
-72:16:45.2 |
HIP 99973 |
8.03 |
| 2026-06-16 00:00 |
20:18:03.60 |
-72:17:08.5 |
HIP 99973 |
7.94 |
| 2026-06-16 12:00 |
20:17:56.19 |
-72:17:31.6 |
HIP 99973 |
7.90 |
| 2026-06-17 00:00 |
20:17:48.73 |
-72:17:54.5 |
HIP 99973 |
7.91 |
| 2026-06-17 12:00 |
20:17:41.22 |
-72:18:17.1 |
HIP 99973 |
7.98 |
| 2026-06-18 00:00 |
20:17:33.66 |
-72:18:39.5 |
HIP 99973 |
8.10 |
| 2026-06-18 12:00 |
20:17:26.04 |
-72:19:01.7 |
HIP 99973 |
8.27 |
| 2026-06-19 00:00 |
20:17:18.38 |
-72:19:23.7 |
HIP 99973 |
8.49 |
| 2026-06-19 12:00 |
20:17:10.66 |
-72:19:45.4 |
HIP 99973 |
8.76 |
| 2026-06-20 00:00 |
20:17:02.89 |
-72:20:06.8 |
HIP 99973 |
9.06 |
| 2026-06-20 12:00 |
20:16:55.08 |
-72:20:28.1 |
HIP 99973 |
9.40 |
| 2026-06-21 00:00 |
20:16:47.21 |
-72:20:49.1 |
HIP 99973 |
9.78 |
| 2026-06-21 12:00 |
20:16:39.30 |
-72:21:09.8 |
HIP 99973 |
10.18 |
| 2026-06-22 00:00 |
20:16:31.34 |
-72:21:30.3 |
HIP 99973 |
10.62 |