C/2001 X1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2001 X1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-01-08T02:12:26.190720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
203 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-01-06.0000000 |
| e |
0.99704180 |
| q (au) |
1.697938 |
| a (au) |
573.976425 |
| i (deg) |
115.626976 |
| Ω (om, deg) |
336.070632 |
| ω (w, deg) |
202.201070 |
| M (ma, deg) |
359.999850 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.612 + 4.130\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.612 |
| n |
4.130 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
22:29:14.15 |
-09:16:48.7 |
HIP 111001 |
22.98 |
| 2026-02-03 12:00 |
22:29:16.37 |
-09:16:34.3 |
HIP 111001 |
23.20 |
| 2026-02-04 00:00 |
22:29:18.59 |
-09:16:19.8 |
HIP 111001 |
23.43 |
| 2026-02-04 12:00 |
22:29:20.82 |
-09:16:05.3 |
HIP 111001 |
23.68 |
| 2026-02-05 00:00 |
22:29:23.06 |
-09:15:50.7 |
HIP 111001 |
23.94 |
| 2026-02-05 12:00 |
22:29:25.30 |
-09:15:36.1 |
HIP 111001 |
24.22 |
| 2026-02-06 00:00 |
22:29:27.55 |
-09:15:21.5 |
HIP 111001 |
24.51 |
| 2026-02-06 12:00 |
22:29:29.80 |
-09:15:06.8 |
HIP 111001 |
24.81 |
| 2026-02-07 00:00 |
22:29:32.07 |
-09:14:52.1 |
HIP 111001 |
25.12 |
| 2026-02-07 12:00 |
22:29:34.33 |
-09:14:37.3 |
HIP 111001 |
25.44 |
| 2026-02-08 00:00 |
22:29:36.61 |
-09:14:22.6 |
HIP 111001 |
25.77 |
| 2026-02-08 12:00 |
22:29:38.89 |
-09:14:07.7 |
HIP 111001 |
26.12 |
| 2026-02-09 00:00 |
22:29:41.18 |
-09:13:52.9 |
HIP 111001 |
26.48 |
| 2026-02-09 12:00 |
22:29:43.47 |
-09:13:38.0 |
HIP 111173 |
26.43 |
| 2026-02-10 00:00 |
22:29:45.76 |
-09:13:23.0 |
HIP 111173 |
26.04 |
| 2026-02-10 12:00 |
22:29:48.07 |
-09:13:08.1 |
HIP 111173 |
25.66 |
| 2026-02-11 00:00 |
22:29:50.37 |
-09:12:53.1 |
HIP 111173 |
25.28 |
| 2026-02-11 12:00 |
22:29:52.68 |
-09:12:38.0 |
HIP 111173 |
24.92 |
| 2026-02-12 00:00 |
22:29:55.00 |
-09:12:23.0 |
HIP 111173 |
24.57 |
| 2026-02-12 12:00 |
22:29:57.32 |
-09:12:07.9 |
HIP 111173 |
24.23 |
| 2026-02-13 00:00 |
22:29:59.64 |
-09:11:52.8 |
HIP 111173 |
23.89 |
| 2026-02-13 12:00 |
22:30:01.97 |
-09:11:37.7 |
HIP 111173 |
23.57 |
| 2026-02-14 00:00 |
22:30:04.31 |
-09:11:22.5 |
HIP 111173 |
23.26 |
| 2026-02-14 12:00 |
22:30:06.64 |
-09:11:07.3 |
HIP 111173 |
22.97 |
| 2026-02-15 00:00 |
22:30:08.98 |
-09:10:52.1 |
HIP 111173 |
22.69 |
| 2026-02-15 12:00 |
22:30:11.33 |
-09:10:36.9 |
HIP 111173 |
22.42 |
| 2026-02-16 00:00 |
22:30:13.67 |
-09:10:21.6 |
HIP 111173 |
22.16 |
| 2026-02-16 12:00 |
22:30:16.02 |
-09:10:06.3 |
HIP 111173 |
21.92 |
| 2026-02-17 00:00 |
22:30:18.37 |
-09:09:51.1 |
HIP 111173 |
21.70 |
| 2026-02-17 12:00 |
22:30:20.73 |
-09:09:35.8 |
HIP 111173 |
21.49 |
| 2026-02-18 00:00 |
22:30:23.08 |
-09:09:20.4 |
HIP 111173 |
21.30 |
| 2026-02-18 12:00 |
22:30:25.44 |
-09:09:05.1 |
HIP 111173 |
21.12 |
| 2026-02-19 00:00 |
22:30:27.80 |
-09:08:49.7 |
HIP 111173 |
20.97 |
| 2026-02-19 12:00 |
22:30:30.17 |
-09:08:34.4 |
HIP 111173 |
20.83 |
| 2026-02-20 00:00 |
22:30:32.53 |
-09:08:19.0 |
HIP 111173 |
20.71 |
| 2026-02-20 12:00 |
22:30:34.90 |
-09:08:03.6 |
HIP 111173 |
20.61 |
| 2026-02-21 00:00 |
22:30:37.26 |
-09:07:48.2 |
HIP 111173 |
20.53 |
| 2026-02-21 12:00 |
22:30:39.63 |
-09:07:32.8 |
HIP 111173 |
20.47 |
| 2026-02-22 00:00 |
22:30:42.00 |
-09:07:17.4 |
HIP 111173 |
20.42 |
| 2026-02-22 12:00 |
22:30:44.37 |
-09:07:02.0 |
HIP 111173 |
20.40 |
| 2026-02-23 00:00 |
22:30:46.74 |
-09:06:46.5 |
HIP 111173 |
20.40 |
| 2026-02-23 12:00 |
22:30:49.11 |
-09:06:31.1 |
HIP 111173 |
20.42 |
| 2026-02-24 00:00 |
22:30:51.48 |
-09:06:15.7 |
HIP 111173 |
20.46 |