C/2008 X3 (LINEAR)
| Parameter |
Value |
| Designation |
C/2008 X3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-10-10T14:06:11.905920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:25Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
16.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-01-07.0000000 |
| e |
0.95653616 |
| q (au) |
1.902117 |
| a (au) |
43.763220 |
| i (deg) |
66.474978 |
| Ω (om, deg) |
337.751045 |
| ω (w, deg) |
140.801601 |
| M (ma, deg) |
0.300991 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.351 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.351 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:14:22.36 |
-68:45:20.1 |
HIP 109708 |
6.46 |
| 2026-02-03 12:00 |
22:14:31.36 |
-68:44:53.0 |
HIP 109708 |
7.01 |
| 2026-02-04 00:00 |
22:14:40.37 |
-68:44:26.2 |
HIP 109708 |
7.63 |
| 2026-02-04 12:00 |
22:14:49.40 |
-68:43:59.8 |
HIP 109708 |
8.32 |
| 2026-02-05 00:00 |
22:14:58.44 |
-68:43:33.7 |
HIP 109708 |
9.05 |
| 2026-02-05 12:00 |
22:15:07.51 |
-68:43:08.0 |
HIP 109708 |
9.81 |
| 2026-02-06 00:00 |
22:15:16.59 |
-68:42:42.5 |
HIP 109708 |
10.61 |
| 2026-02-06 12:00 |
22:15:25.68 |
-68:42:17.4 |
HIP 109708 |
11.43 |
| 2026-02-07 00:00 |
22:15:34.79 |
-68:41:52.7 |
HIP 109708 |
12.26 |
| 2026-02-07 12:00 |
22:15:43.91 |
-68:41:28.3 |
HIP 109708 |
13.11 |
| 2026-02-08 00:00 |
22:15:53.05 |
-68:41:04.2 |
HIP 109708 |
13.97 |
| 2026-02-08 12:00 |
22:16:02.20 |
-68:40:40.4 |
HIP 109708 |
14.83 |
| 2026-02-09 00:00 |
22:16:11.36 |
-68:40:17.0 |
HIP 109708 |
15.71 |
| 2026-02-09 12:00 |
22:16:20.54 |
-68:39:54.0 |
HIP 109708 |
16.59 |
| 2026-02-10 00:00 |
22:16:29.73 |
-68:39:31.2 |
HIP 109708 |
17.47 |
| 2026-02-10 12:00 |
22:16:38.92 |
-68:39:08.9 |
HIP 109708 |
18.36 |
| 2026-02-11 00:00 |
22:16:48.13 |
-68:38:46.8 |
HIP 109988 |
18.04 |
| 2026-02-11 12:00 |
22:16:57.35 |
-68:38:25.2 |
HIP 109988 |
17.75 |
| 2026-02-12 00:00 |
22:17:06.58 |
-68:38:03.8 |
HIP 109988 |
17.51 |
| 2026-02-12 12:00 |
22:17:15.82 |
-68:37:42.9 |
HIP 109988 |
17.33 |
| 2026-02-13 00:00 |
22:17:25.06 |
-68:37:22.2 |
HIP 109988 |
17.19 |
| 2026-02-13 12:00 |
22:17:34.31 |
-68:37:02.0 |
HIP 109988 |
17.11 |
| 2026-02-14 00:00 |
22:17:43.57 |
-68:36:42.0 |
HIP 109988 |
17.09 |
| 2026-02-14 12:00 |
22:17:52.84 |
-68:36:22.5 |
HIP 109988 |
17.12 |
| 2026-02-15 00:00 |
22:18:02.11 |
-68:36:03.3 |
HIP 109988 |
17.20 |
| 2026-02-15 12:00 |
22:18:11.39 |
-68:35:44.4 |
HIP 109988 |
17.33 |
| 2026-02-16 00:00 |
22:18:20.67 |
-68:35:25.9 |
HIP 110161 |
16.88 |
| 2026-02-16 12:00 |
22:18:29.96 |
-68:35:07.8 |
HIP 110161 |
16.47 |
| 2026-02-17 00:00 |
22:18:39.25 |
-68:34:50.1 |
HIP 110161 |
16.10 |
| 2026-02-17 12:00 |
22:18:48.55 |
-68:34:32.7 |
HIP 110161 |
15.79 |
| 2026-02-18 00:00 |
22:18:57.84 |
-68:34:15.6 |
HIP 110161 |
15.52 |
| 2026-02-18 12:00 |
22:19:07.14 |
-68:33:58.9 |
HIP 110161 |
15.31 |
| 2026-02-19 00:00 |
22:19:16.44 |
-68:33:42.6 |
HIP 110161 |
15.15 |
| 2026-02-19 12:00 |
22:19:25.74 |
-68:33:26.7 |
HIP 110161 |
15.06 |
| 2026-02-20 00:00 |
22:19:35.04 |
-68:33:11.1 |
HIP 110161 |
15.02 |
| 2026-02-20 12:00 |
22:19:44.34 |
-68:32:55.9 |
HIP 110161 |
15.04 |
| 2026-02-21 00:00 |
22:19:53.64 |
-68:32:41.1 |
HIP 110161 |
15.12 |
| 2026-02-21 12:00 |
22:20:02.93 |
-68:32:26.6 |
HIP 110161 |
15.26 |
| 2026-02-22 00:00 |
22:20:12.23 |
-68:32:12.5 |
HIP 110161 |
15.45 |
| 2026-02-22 12:00 |
22:20:21.52 |
-68:31:58.8 |
HIP 110161 |
15.69 |
| 2026-02-23 00:00 |
22:20:30.81 |
-68:31:45.4 |
HIP 110161 |
15.99 |
| 2026-02-23 12:00 |
22:20:40.09 |
-68:31:32.5 |
HIP 110161 |
16.33 |
| 2026-02-24 00:00 |
22:20:49.37 |
-68:31:19.8 |
HIP 110161 |
16.71 |