| 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) |
| 2026-09-25 00:00 |
19:51:39.81 |
-71:57:30.6 |
HIP 97644 |
12.05 |
| 2026-09-25 12:00 |
19:51:36.36 |
-71:56:58.4 |
HIP 97644 |
11.45 |
| 2026-09-26 00:00 |
19:51:32.98 |
-71:56:26.0 |
HIP 97644 |
10.85 |
| 2026-09-26 12:00 |
19:51:29.68 |
-71:55:53.4 |
HIP 97644 |
10.26 |
| 2026-09-27 00:00 |
19:51:26.46 |
-71:55:20.8 |
HIP 97644 |
9.66 |
| 2026-09-27 12:00 |
19:51:23.32 |
-71:54:47.9 |
HIP 97644 |
9.06 |
| 2026-09-28 00:00 |
19:51:20.25 |
-71:54:15.0 |
HIP 97644 |
8.46 |
| 2026-09-28 12:00 |
19:51:17.26 |
-71:53:41.9 |
HIP 97644 |
7.87 |
| 2026-09-29 00:00 |
19:51:14.35 |
-71:53:08.6 |
HIP 97644 |
7.27 |
| 2026-09-29 12:00 |
19:51:11.52 |
-71:52:35.3 |
HIP 97644 |
6.67 |
| 2026-09-30 00:00 |
19:51:08.76 |
-71:52:01.8 |
HIP 97644 |
6.07 |
| 2026-09-30 12:00 |
19:51:06.08 |
-71:51:28.1 |
HIP 97644 |
5.47 |
| 2026-10-01 00:00 |
19:51:03.48 |
-71:50:54.4 |
HIP 97644 |
4.88 |
| 2026-10-01 12:00 |
19:51:00.96 |
-71:50:20.5 |
HIP 97644 |
4.28 |
| 2026-10-02 00:00 |
19:50:58.51 |
-71:49:46.5 |
HIP 97644 |
3.68 |
| 2026-10-02 12:00 |
19:50:56.15 |
-71:49:12.4 |
HIP 97644 |
3.08 |
| 2026-10-03 00:00 |
19:50:53.86 |
-71:48:38.1 |
HIP 97644 |
2.48 |
| 2026-10-03 12:00 |
19:50:51.65 |
-71:48:03.8 |
HIP 97644 |
1.89 |
| 2026-10-04 00:00 |
19:50:49.52 |
-71:47:29.3 |
HIP 97644 |
1.29 |
| 2026-10-04 12:00 |
19:50:47.47 |
-71:46:54.7 |
HIP 97644 |
0.70 |
| 2026-10-05 00:00 |
19:50:45.50 |
-71:46:20.1 |
HIP 97644 |
0.16 |
| 2026-10-05 12:00 |
19:50:43.61 |
-71:45:45.3 |
HIP 97644 |
0.53 |
| 2026-10-06 00:00 |
19:50:41.79 |
-71:45:10.4 |
HIP 97644 |
1.12 |
| 2026-10-06 12:00 |
19:50:40.06 |
-71:44:35.4 |
HIP 97644 |
1.72 |
| 2026-10-07 00:00 |
19:50:38.40 |
-71:44:00.3 |
HIP 97644 |
2.32 |
| 2026-10-07 12:00 |
19:50:36.83 |
-71:43:25.1 |
HIP 97644 |
2.91 |
| 2026-10-08 00:00 |
19:50:35.33 |
-71:42:49.9 |
HIP 97644 |
3.51 |
| 2026-10-08 12:00 |
19:50:33.91 |
-71:42:14.5 |
HIP 97644 |
4.11 |
| 2026-10-09 00:00 |
19:50:32.57 |
-71:41:39.1 |
HIP 97644 |
4.71 |
| 2026-10-09 12:00 |
19:50:31.32 |
-71:41:03.5 |
HIP 97644 |
5.31 |
| 2026-10-10 00:00 |
19:50:30.14 |
-71:40:27.9 |
HIP 97644 |
5.91 |
| 2026-10-10 12:00 |
19:50:29.04 |
-71:39:52.2 |
HIP 97644 |
6.52 |
| 2026-10-11 00:00 |
19:50:28.02 |
-71:39:16.4 |
HIP 97644 |
7.12 |
| 2026-10-11 12:00 |
19:50:27.08 |
-71:38:40.6 |
HIP 97644 |
7.72 |
| 2026-10-12 00:00 |
19:50:26.22 |
-71:38:04.7 |
HIP 97644 |
8.32 |
| 2026-10-12 12:00 |
19:50:25.43 |
-71:37:28.7 |
HIP 97644 |
8.92 |
| 2026-10-13 00:00 |
19:50:24.73 |
-71:36:52.7 |
HIP 97644 |
9.52 |
| 2026-10-13 12:00 |
19:50:24.11 |
-71:36:16.5 |
HIP 97644 |
10.13 |
| 2026-10-14 00:00 |
19:50:23.56 |
-71:35:40.4 |
HIP 97644 |
10.73 |
| 2026-10-14 12:00 |
19:50:23.10 |
-71:35:04.1 |
HIP 97644 |
11.33 |
| 2026-10-15 00:00 |
19:50:22.71 |
-71:34:27.9 |
HIP 97644 |
11.93 |
| 2026-10-15 12:00 |
19:50:22.40 |
-71:33:51.5 |
HIP 97644 |
12.54 |
| 2026-10-16 00:00 |
19:50:22.17 |
-71:33:15.1 |
HIP 97644 |
13.14 |