| Parameter |
Value |
| Designation |
C/2001 C1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-03-28T09:55:55.508160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
229 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-04-12.0000000 |
| e |
0.99987490 |
| q (au) |
5.104333 |
| a (au) |
40802.601593 |
| i (deg) |
68.964525 |
| Ω (om, deg) |
33.716342 |
| ω (w, deg) |
219.949836 |
| M (ma, deg) |
359.999958 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.962 + 2.253\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.962 |
| n |
2.253 |
| gf |
0.885 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.406 |
| 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 |
02:03:24.07 |
+11:49:02.1 |
HIP 9561 |
27.87 |
| 2026-03-26 12:00 |
02:03:26.39 |
+11:49:17.8 |
HIP 9561 |
28.29 |
| 2026-03-27 00:00 |
02:03:28.72 |
+11:49:33.5 |
HIP 9561 |
28.71 |
| 2026-03-27 12:00 |
02:03:31.06 |
+11:49:49.3 |
HIP 9561 |
29.15 |
| 2026-03-28 00:00 |
02:03:33.41 |
+11:50:05.1 |
HIP 9561 |
29.59 |
| 2026-03-28 12:00 |
02:03:35.77 |
+11:50:21.0 |
HIP 9561 |
30.04 |
| 2026-03-29 00:00 |
02:03:38.14 |
+11:50:36.9 |
HIP 9490 |
30.31 |
| 2026-03-29 12:00 |
02:03:40.51 |
+11:50:52.9 |
HIP 9490 |
30.57 |
| 2026-03-30 00:00 |
02:03:42.90 |
+11:51:08.9 |
HIP 9490 |
30.84 |
| 2026-03-30 12:00 |
02:03:45.29 |
+11:51:25.0 |
HIP 9490 |
31.13 |
| 2026-03-31 00:00 |
02:03:47.70 |
+11:51:41.0 |
HIP 9764 |
31.41 |
| 2026-03-31 12:00 |
02:03:50.11 |
+11:51:57.2 |
HIP 9764 |
30.78 |
| 2026-04-01 00:00 |
02:03:52.53 |
+11:52:13.3 |
HIP 9764 |
30.14 |
| 2026-04-01 12:00 |
02:03:54.95 |
+11:52:29.5 |
HIP 9764 |
29.50 |
| 2026-04-02 00:00 |
02:03:57.39 |
+11:52:45.7 |
HIP 9764 |
28.86 |
| 2026-04-02 12:00 |
02:03:59.83 |
+11:53:02.0 |
HIP 9764 |
28.22 |
| 2026-04-03 00:00 |
02:04:02.28 |
+11:53:18.3 |
HIP 9764 |
27.58 |
| 2026-04-03 12:00 |
02:04:04.74 |
+11:53:34.6 |
HIP 9764 |
26.94 |
| 2026-04-04 00:00 |
02:04:07.21 |
+11:53:51.0 |
HIP 9764 |
26.30 |
| 2026-04-04 12:00 |
02:04:09.68 |
+11:54:07.4 |
HIP 9764 |
25.66 |
| 2026-04-05 00:00 |
02:04:12.16 |
+11:54:23.8 |
HIP 9764 |
25.01 |
| 2026-04-05 12:00 |
02:04:14.64 |
+11:54:40.3 |
HIP 9764 |
24.37 |
| 2026-04-06 00:00 |
02:04:17.14 |
+11:54:56.7 |
HIP 9764 |
23.72 |
| 2026-04-06 12:00 |
02:04:19.63 |
+11:55:13.2 |
HIP 9764 |
23.08 |
| 2026-04-07 00:00 |
02:04:22.14 |
+11:55:29.8 |
HIP 9764 |
22.43 |
| 2026-04-07 12:00 |
02:04:24.65 |
+11:55:46.3 |
HIP 9764 |
21.79 |
| 2026-04-08 00:00 |
02:04:27.17 |
+11:56:02.9 |
HIP 9764 |
21.14 |
| 2026-04-08 12:00 |
02:04:29.69 |
+11:56:19.5 |
HIP 9764 |
20.50 |
| 2026-04-09 00:00 |
02:04:32.22 |
+11:56:36.2 |
HIP 9764 |
19.86 |
| 2026-04-09 12:00 |
02:04:34.75 |
+11:56:52.8 |
HIP 9764 |
19.22 |
| 2026-04-10 00:00 |
02:04:37.29 |
+11:57:09.5 |
HIP 9764 |
18.58 |
| 2026-04-10 12:00 |
02:04:39.83 |
+11:57:26.2 |
HIP 9764 |
17.94 |
| 2026-04-11 00:00 |
02:04:42.38 |
+11:57:42.9 |
HIP 9764 |
17.30 |
| 2026-04-11 12:00 |
02:04:44.94 |
+11:57:59.6 |
HIP 9764 |
16.67 |
| 2026-04-12 00:00 |
02:04:47.49 |
+11:58:16.4 |
HIP 9764 |
16.04 |
| 2026-04-12 12:00 |
02:04:50.05 |
+11:58:33.2 |
HIP 9764 |
15.41 |
| 2026-04-13 00:00 |
02:04:52.62 |
+11:58:49.9 |
HIP 9764 |
14.79 |
| 2026-04-13 12:00 |
02:04:55.19 |
+11:59:06.7 |
HIP 9764 |
14.18 |
| 2026-04-14 00:00 |
02:04:57.77 |
+11:59:23.5 |
HIP 9764 |
13.57 |
| 2026-04-14 12:00 |
02:05:00.34 |
+11:59:40.4 |
HIP 9764 |
12.96 |
| 2026-04-15 00:00 |
02:05:02.92 |
+11:59:57.2 |
HIP 9764 |
12.37 |
| 2026-04-15 12:00 |
02:05:05.51 |
+12:00:14.1 |
HIP 9764 |
11.78 |
| 2026-04-16 00:00 |
02:05:08.10 |
+12:00:30.9 |
HIP 9764 |
11.21 |