| 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) |
| 2026-05-12 00:00 |
02:07:22.29 |
+12:14:56.9 |
HIP 9764 |
27.45 |
| 2026-05-12 12:00 |
02:07:24.78 |
+12:15:13.0 |
HIP 9764 |
28.10 |
| 2026-05-13 00:00 |
02:07:27.27 |
+12:15:29.0 |
HIP 9764 |
28.75 |
| 2026-05-13 12:00 |
02:07:29.75 |
+12:15:44.9 |
HIP 9764 |
29.39 |
| 2026-05-14 00:00 |
02:07:32.22 |
+12:16:00.8 |
HIP 9764 |
30.04 |
| 2026-05-14 12:00 |
02:07:34.69 |
+12:16:16.7 |
HIP 9764 |
30.68 |
| 2026-05-15 00:00 |
02:07:37.15 |
+12:16:32.6 |
HIP 9764 |
31.32 |
| 2026-05-15 12:00 |
02:07:39.60 |
+12:16:48.3 |
HIP 9764 |
31.96 |
| 2026-05-16 00:00 |
02:07:42.04 |
+12:17:04.1 |
HIP 9764 |
32.60 |
| 2026-05-16 12:00 |
02:07:44.48 |
+12:17:19.8 |
HIP 9764 |
33.24 |
| 2026-05-17 00:00 |
02:07:46.91 |
+12:17:35.5 |
HIP 10106 |
33.41 |
| 2026-05-17 12:00 |
02:07:49.33 |
+12:17:51.1 |
HIP 10106 |
32.79 |
| 2026-05-18 00:00 |
02:07:51.74 |
+12:18:06.6 |
HIP 10106 |
32.19 |
| 2026-05-18 12:00 |
02:07:54.15 |
+12:18:22.1 |
HIP 10106 |
31.58 |
| 2026-05-19 00:00 |
02:07:56.55 |
+12:18:37.6 |
HIP 10106 |
30.98 |
| 2026-05-19 12:00 |
02:07:58.93 |
+12:18:53.0 |
HIP 10106 |
30.38 |
| 2026-05-20 00:00 |
02:08:01.31 |
+12:19:08.4 |
HIP 10106 |
29.79 |
| 2026-05-20 12:00 |
02:08:03.68 |
+12:19:23.7 |
HIP 10106 |
29.20 |
| 2026-05-21 00:00 |
02:08:06.04 |
+12:19:38.9 |
HIP 10106 |
28.61 |
| 2026-05-21 12:00 |
02:08:08.40 |
+12:19:54.1 |
HIP 10106 |
28.03 |
| 2026-05-22 00:00 |
02:08:10.74 |
+12:20:09.3 |
HIP 10106 |
27.45 |
| 2026-05-22 12:00 |
02:08:13.07 |
+12:20:24.4 |
HIP 10106 |
26.88 |
| 2026-05-23 00:00 |
02:08:15.39 |
+12:20:39.4 |
HIP 10106 |
26.31 |
| 2026-05-23 12:00 |
02:08:17.71 |
+12:20:54.4 |
HIP 10106 |
25.74 |
| 2026-05-24 00:00 |
02:08:20.01 |
+12:21:09.3 |
HIP 10106 |
25.18 |
| 2026-05-24 12:00 |
02:08:22.30 |
+12:21:24.2 |
HIP 10106 |
24.63 |
| 2026-05-25 00:00 |
02:08:24.59 |
+12:21:39.0 |
HIP 10106 |
24.08 |
| 2026-05-25 12:00 |
02:08:26.86 |
+12:21:53.8 |
HIP 10106 |
23.54 |
| 2026-05-26 00:00 |
02:08:29.12 |
+12:22:08.4 |
HIP 10106 |
23.00 |
| 2026-05-26 12:00 |
02:08:31.37 |
+12:22:23.1 |
HIP 10106 |
22.47 |
| 2026-05-27 00:00 |
02:08:33.61 |
+12:22:37.6 |
HIP 10106 |
21.95 |
| 2026-05-27 12:00 |
02:08:35.84 |
+12:22:52.1 |
HIP 10106 |
21.43 |
| 2026-05-28 00:00 |
02:08:38.06 |
+12:23:06.6 |
HIP 10106 |
20.92 |
| 2026-05-28 12:00 |
02:08:40.26 |
+12:23:21.0 |
HIP 10106 |
20.41 |
| 2026-05-29 00:00 |
02:08:42.46 |
+12:23:35.3 |
HIP 10106 |
19.92 |
| 2026-05-29 12:00 |
02:08:44.64 |
+12:23:49.5 |
HIP 10106 |
19.43 |
| 2026-05-30 00:00 |
02:08:46.81 |
+12:24:03.7 |
HIP 10106 |
18.94 |
| 2026-05-30 12:00 |
02:08:48.97 |
+12:24:17.8 |
HIP 10106 |
18.47 |
| 2026-05-31 00:00 |
02:08:51.12 |
+12:24:31.9 |
HIP 10106 |
18.01 |
| 2026-05-31 12:00 |
02:08:53.26 |
+12:24:45.9 |
HIP 10106 |
17.55 |
| 2026-06-01 00:00 |
02:08:55.38 |
+12:24:59.8 |
HIP 10106 |
17.10 |
| 2026-06-01 12:00 |
02:08:57.49 |
+12:25:13.6 |
HIP 10106 |
16.67 |
| 2026-06-02 00:00 |
02:08:59.59 |
+12:25:27.4 |
HIP 10106 |
16.24 |