| Parameter |
Value |
| Designation |
C/2004 X3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-06-17T04:32:11.241600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:45Z |
| Obs used |
241 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-02-19.0000000 |
| e |
1.00642712 |
| q (au) |
4.402298 |
| a (au) |
-684.956072 |
| i (deg) |
81.076589 |
| Ω (om, deg) |
343.047740 |
| ω (w, deg) |
202.126117 |
| M (ma, deg) |
-0.006498 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.305 + 3.877\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.305 |
| n |
3.877 |
| gf |
0.944 |
| gb |
-0.765 |
| k |
0.800 |
| δ90 |
9.207 |
| 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) |
| 2026-03-26 00:00 |
23:17:03.83 |
-23:07:43.3 |
HIP 114907 |
9.80 |
| 2026-03-26 12:00 |
23:17:06.64 |
-23:07:28.0 |
HIP 114907 |
10.47 |
| 2026-03-27 00:00 |
23:17:09.45 |
-23:07:12.9 |
HIP 114907 |
11.15 |
| 2026-03-27 12:00 |
23:17:12.24 |
-23:06:57.9 |
HIP 114907 |
11.82 |
| 2026-03-28 00:00 |
23:17:15.03 |
-23:06:43.1 |
HIP 114907 |
12.49 |
| 2026-03-28 12:00 |
23:17:17.82 |
-23:06:28.4 |
HIP 114907 |
13.16 |
| 2026-03-29 00:00 |
23:17:20.59 |
-23:06:13.9 |
HIP 114907 |
13.83 |
| 2026-03-29 12:00 |
23:17:23.35 |
-23:05:59.6 |
HIP 114907 |
14.50 |
| 2026-03-30 00:00 |
23:17:26.11 |
-23:05:45.4 |
HIP 114907 |
15.16 |
| 2026-03-30 12:00 |
23:17:28.85 |
-23:05:31.4 |
HIP 114907 |
15.82 |
| 2026-03-31 00:00 |
23:17:31.59 |
-23:05:17.5 |
HIP 114999 |
16.44 |
| 2026-03-31 12:00 |
23:17:34.32 |
-23:05:03.8 |
HIP 114999 |
16.25 |
| 2026-04-01 00:00 |
23:17:37.04 |
-23:04:50.2 |
HIP 114999 |
16.09 |
| 2026-04-01 12:00 |
23:17:39.75 |
-23:04:36.9 |
HIP 114999 |
15.96 |
| 2026-04-02 00:00 |
23:17:42.45 |
-23:04:23.7 |
HIP 114999 |
15.85 |
| 2026-04-02 12:00 |
23:17:45.13 |
-23:04:10.6 |
HIP 114999 |
15.78 |
| 2026-04-03 00:00 |
23:17:47.81 |
-23:03:57.7 |
HIP 114999 |
15.73 |
| 2026-04-03 12:00 |
23:17:50.48 |
-23:03:45.0 |
HIP 114999 |
15.71 |
| 2026-04-04 00:00 |
23:17:53.14 |
-23:03:32.4 |
HIP 114999 |
15.72 |
| 2026-04-04 12:00 |
23:17:55.79 |
-23:03:20.1 |
HIP 114999 |
15.76 |
| 2026-04-05 00:00 |
23:17:58.42 |
-23:03:07.8 |
HIP 114999 |
15.83 |
| 2026-04-05 12:00 |
23:18:01.05 |
-23:02:55.8 |
HIP 114999 |
15.92 |
| 2026-04-06 00:00 |
23:18:03.66 |
-23:02:43.9 |
HIP 114999 |
16.04 |
| 2026-04-06 12:00 |
23:18:06.26 |
-23:02:32.2 |
HIP 114999 |
16.19 |
| 2026-04-07 00:00 |
23:18:08.86 |
-23:02:20.6 |
HIP 114999 |
16.35 |
| 2026-04-07 12:00 |
23:18:11.43 |
-23:02:09.3 |
HIP 114999 |
16.55 |
| 2026-04-08 00:00 |
23:18:14.00 |
-23:01:58.1 |
HIP 114999 |
16.76 |
| 2026-04-08 12:00 |
23:18:16.56 |
-23:01:47.0 |
HIP 114999 |
16.99 |
| 2026-04-09 00:00 |
23:18:19.10 |
-23:01:36.2 |
HIP 114999 |
17.24 |
| 2026-04-09 12:00 |
23:18:21.63 |
-23:01:25.5 |
HIP 114999 |
17.51 |
| 2026-04-10 00:00 |
23:18:24.15 |
-23:01:15.0 |
HIP 114999 |
17.80 |
| 2026-04-10 12:00 |
23:18:26.65 |
-23:01:04.6 |
HIP 114999 |
18.10 |
| 2026-04-11 00:00 |
23:18:29.14 |
-23:00:54.5 |
HIP 114999 |
18.42 |
| 2026-04-11 12:00 |
23:18:31.62 |
-23:00:44.5 |
HIP 114999 |
18.75 |
| 2026-04-12 00:00 |
23:18:34.09 |
-23:00:34.7 |
HIP 114999 |
19.09 |
| 2026-04-12 12:00 |
23:18:36.54 |
-23:00:25.0 |
HIP 114999 |
19.44 |
| 2026-04-13 00:00 |
23:18:38.98 |
-23:00:15.6 |
HIP 115173 |
19.58 |
| 2026-04-13 12:00 |
23:18:41.40 |
-23:00:06.3 |
HIP 115173 |
19.28 |
| 2026-04-14 00:00 |
23:18:43.81 |
-22:59:57.2 |
HIP 115173 |
18.99 |
| 2026-04-14 12:00 |
23:18:46.21 |
-22:59:48.2 |
HIP 115173 |
18.72 |
| 2026-04-15 00:00 |
23:18:48.59 |
-22:59:39.5 |
HIP 115173 |
18.46 |
| 2026-04-15 12:00 |
23:18:50.95 |
-22:59:30.9 |
HIP 115173 |
18.22 |
| 2026-04-16 00:00 |
23:18:53.30 |
-22:59:22.5 |
HIP 115173 |
17.99 |