C/2001 W1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2001 W1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-12-24T21:37:29.415360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
101 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-12-04.0000000 |
| e |
0.99892724 |
| q (au) |
2.399249 |
| a (au) |
2236.511889 |
| i (deg) |
118.645272 |
| Ω (om, deg) |
91.939782 |
| ω (w, deg) |
6.161504 |
| M (ma, deg) |
359.999805 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.635 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.635 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.512 |
| 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 |
18:49:10.60 |
-05:18:47.5 |
HIP 92277 |
18.04 |
| 2026-02-03 12:00 |
18:49:12.78 |
-05:18:40.0 |
HIP 92277 |
18.32 |
| 2026-02-04 00:00 |
18:49:14.95 |
-05:18:32.5 |
HIP 92277 |
18.61 |
| 2026-02-04 12:00 |
18:49:17.10 |
-05:18:24.9 |
HIP 92277 |
18.91 |
| 2026-02-05 00:00 |
18:49:19.25 |
-05:18:17.3 |
HIP 92277 |
19.21 |
| 2026-02-05 12:00 |
18:49:21.38 |
-05:18:09.6 |
HIP 92277 |
19.53 |
| 2026-02-06 00:00 |
18:49:23.49 |
-05:18:01.8 |
HIP 92277 |
19.85 |
| 2026-02-06 12:00 |
18:49:25.60 |
-05:17:53.9 |
HIP 92277 |
20.17 |
| 2026-02-07 00:00 |
18:49:27.69 |
-05:17:45.9 |
HIP 92277 |
20.51 |
| 2026-02-07 12:00 |
18:49:29.77 |
-05:17:37.9 |
HIP 92277 |
20.84 |
| 2026-02-08 00:00 |
18:49:31.83 |
-05:17:29.9 |
HIP 92277 |
21.19 |
| 2026-02-08 12:00 |
18:49:33.88 |
-05:17:21.7 |
HIP 92277 |
21.53 |
| 2026-02-09 00:00 |
18:49:35.92 |
-05:17:13.5 |
HIP 92277 |
21.88 |
| 2026-02-09 12:00 |
18:49:37.94 |
-05:17:05.2 |
HIP 92277 |
22.24 |
| 2026-02-10 00:00 |
18:49:39.95 |
-05:16:56.9 |
HIP 92277 |
22.59 |
| 2026-02-10 12:00 |
18:49:41.95 |
-05:16:48.5 |
HIP 92277 |
22.95 |
| 2026-02-11 00:00 |
18:49:43.93 |
-05:16:40.0 |
HIP 92277 |
23.31 |
| 2026-02-11 12:00 |
18:49:45.89 |
-05:16:31.4 |
HIP 92277 |
23.68 |
| 2026-02-12 00:00 |
18:49:47.84 |
-05:16:22.8 |
HIP 92277 |
24.04 |
| 2026-02-12 12:00 |
18:49:49.78 |
-05:16:14.2 |
HIP 92277 |
24.41 |
| 2026-02-13 00:00 |
18:49:51.70 |
-05:16:05.4 |
HIP 92277 |
24.78 |
| 2026-02-13 12:00 |
18:49:53.60 |
-05:15:56.6 |
HIP 92277 |
25.14 |
| 2026-02-14 00:00 |
18:49:55.49 |
-05:15:47.8 |
HIP 92277 |
25.51 |
| 2026-02-14 12:00 |
18:49:57.37 |
-05:15:38.9 |
HIP 92277 |
25.88 |
| 2026-02-15 00:00 |
18:49:59.22 |
-05:15:29.9 |
HIP 92277 |
26.25 |
| 2026-02-15 12:00 |
18:50:01.07 |
-05:15:20.9 |
HIP 92277 |
26.62 |
| 2026-02-16 00:00 |
18:50:02.89 |
-05:15:11.8 |
HIP 92277 |
26.98 |
| 2026-02-16 12:00 |
18:50:04.70 |
-05:15:02.7 |
HIP 92277 |
27.35 |
| 2026-02-17 00:00 |
18:50:06.50 |
-05:14:53.5 |
HIP 92277 |
27.72 |
| 2026-02-17 12:00 |
18:50:08.27 |
-05:14:44.2 |
HIP 92277 |
28.08 |
| 2026-02-18 00:00 |
18:50:10.03 |
-05:14:34.9 |
HIP 92277 |
28.45 |
| 2026-02-18 12:00 |
18:50:11.78 |
-05:14:25.6 |
HIP 92277 |
28.81 |
| 2026-02-19 00:00 |
18:50:13.50 |
-05:14:16.2 |
HIP 92277 |
29.17 |
| 2026-02-19 12:00 |
18:50:15.21 |
-05:14:06.7 |
HIP 92277 |
29.53 |
| 2026-02-20 00:00 |
18:50:16.91 |
-05:13:57.2 |
HIP 92277 |
29.89 |
| 2026-02-20 12:00 |
18:50:18.58 |
-05:13:47.6 |
HIP 92277 |
30.24 |
| 2026-02-21 00:00 |
18:50:20.24 |
-05:13:38.0 |
HIP 92277 |
30.60 |
| 2026-02-21 12:00 |
18:50:21.88 |
-05:13:28.4 |
HIP 92277 |
30.95 |
| 2026-02-22 00:00 |
18:50:23.50 |
-05:13:18.7 |
HIP 92277 |
31.30 |
| 2026-02-22 12:00 |
18:50:25.11 |
-05:13:09.0 |
HIP 92277 |
31.64 |
| 2026-02-23 00:00 |
18:50:26.69 |
-05:12:59.2 |
HIP 92277 |
31.99 |
| 2026-02-23 12:00 |
18:50:28.26 |
-05:12:49.3 |
HIP 92277 |
32.33 |
| 2026-02-24 00:00 |
18:50:29.81 |
-05:12:39.5 |
HIP 92277 |
32.67 |