C/2001 U6 (LINEAR)
| Parameter |
Value |
| Designation |
C/2001 U6 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-08-08T15:49:53.086080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
110 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-03-25.0000000 |
| e |
0.99616717 |
| q (au) |
4.406416 |
| a (au) |
1149.649515 |
| i (deg) |
107.255502 |
| Ω (om, deg) |
115.230514 |
| ω (w, deg) |
85.715141 |
| M (ma, deg) |
359.996545 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.267 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.267 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.994 |
| 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 |
19:00:48.65 |
-67:41:25.9 |
HIP 92975 |
24.56 |
| 2026-02-03 12:00 |
19:00:54.93 |
-67:41:40.9 |
HIP 92975 |
25.17 |
| 2026-02-04 00:00 |
19:01:01.17 |
-67:41:56.1 |
HIP 92975 |
25.77 |
| 2026-02-04 12:00 |
19:01:07.38 |
-67:42:11.6 |
HIP 93454 |
26.31 |
| 2026-02-05 00:00 |
19:01:13.57 |
-67:42:27.3 |
HIP 93454 |
25.96 |
| 2026-02-05 12:00 |
19:01:19.72 |
-67:42:43.2 |
HIP 93454 |
25.61 |
| 2026-02-06 00:00 |
19:01:25.84 |
-67:42:59.3 |
HIP 93454 |
25.27 |
| 2026-02-06 12:00 |
19:01:31.93 |
-67:43:15.7 |
HIP 93454 |
24.93 |
| 2026-02-07 00:00 |
19:01:37.99 |
-67:43:32.3 |
HIP 93454 |
24.61 |
| 2026-02-07 12:00 |
19:01:44.01 |
-67:43:49.1 |
HIP 93454 |
24.29 |
| 2026-02-08 00:00 |
19:01:50.01 |
-67:44:06.1 |
HIP 93454 |
23.98 |
| 2026-02-08 12:00 |
19:01:55.97 |
-67:44:23.3 |
HIP 93454 |
23.68 |
| 2026-02-09 00:00 |
19:02:01.89 |
-67:44:40.8 |
HIP 93454 |
23.40 |
| 2026-02-09 12:00 |
19:02:07.78 |
-67:44:58.5 |
HIP 93454 |
23.12 |
| 2026-02-10 00:00 |
19:02:13.64 |
-67:45:16.4 |
HIP 93454 |
22.85 |
| 2026-02-10 12:00 |
19:02:19.46 |
-67:45:34.5 |
HIP 93454 |
22.59 |
| 2026-02-11 00:00 |
19:02:25.25 |
-67:45:52.8 |
HIP 93454 |
22.34 |
| 2026-02-11 12:00 |
19:02:31.00 |
-67:46:11.3 |
HIP 93454 |
22.10 |
| 2026-02-12 00:00 |
19:02:36.71 |
-67:46:30.1 |
HIP 93454 |
21.87 |
| 2026-02-12 12:00 |
19:02:42.39 |
-67:46:49.0 |
HIP 93454 |
21.66 |
| 2026-02-13 00:00 |
19:02:48.03 |
-67:47:08.2 |
HIP 93454 |
21.45 |
| 2026-02-13 12:00 |
19:02:53.63 |
-67:47:27.6 |
HIP 93454 |
21.26 |
| 2026-02-14 00:00 |
19:02:59.19 |
-67:47:47.2 |
HIP 93454 |
21.08 |
| 2026-02-14 12:00 |
19:03:04.72 |
-67:48:07.0 |
HIP 93454 |
20.91 |
| 2026-02-15 00:00 |
19:03:10.20 |
-67:48:27.0 |
HIP 93454 |
20.75 |
| 2026-02-15 12:00 |
19:03:15.65 |
-67:48:47.3 |
HIP 93454 |
20.61 |
| 2026-02-16 00:00 |
19:03:21.05 |
-67:49:07.7 |
HIP 93454 |
20.48 |
| 2026-02-16 12:00 |
19:03:26.42 |
-67:49:28.3 |
HIP 93454 |
20.36 |
| 2026-02-17 00:00 |
19:03:31.74 |
-67:49:49.2 |
HIP 93454 |
20.25 |
| 2026-02-17 12:00 |
19:03:37.03 |
-67:50:10.2 |
HIP 93454 |
20.16 |
| 2026-02-18 00:00 |
19:03:42.27 |
-67:50:31.4 |
HIP 93454 |
20.08 |
| 2026-02-18 12:00 |
19:03:47.47 |
-67:50:52.9 |
HIP 93454 |
20.01 |
| 2026-02-19 00:00 |
19:03:52.63 |
-67:51:14.5 |
HIP 93454 |
19.96 |
| 2026-02-19 12:00 |
19:03:57.74 |
-67:51:36.4 |
HIP 93454 |
19.92 |
| 2026-02-20 00:00 |
19:04:02.81 |
-67:51:58.4 |
HIP 93454 |
19.89 |
| 2026-02-20 12:00 |
19:04:07.84 |
-67:52:20.6 |
HIP 93454 |
19.87 |
| 2026-02-21 00:00 |
19:04:12.82 |
-67:52:43.1 |
HIP 93454 |
19.87 |
| 2026-02-21 12:00 |
19:04:17.76 |
-67:53:05.7 |
HIP 93454 |
19.88 |
| 2026-02-22 00:00 |
19:04:22.66 |
-67:53:28.5 |
HIP 93454 |
19.90 |
| 2026-02-22 12:00 |
19:04:27.51 |
-67:53:51.5 |
HIP 93454 |
19.94 |
| 2026-02-23 00:00 |
19:04:32.31 |
-67:54:14.7 |
HIP 93454 |
19.99 |
| 2026-02-23 12:00 |
19:04:37.07 |
-67:54:38.0 |
HIP 93454 |
20.04 |
| 2026-02-24 00:00 |
19:04:41.78 |
-67:55:01.6 |
HIP 93454 |
20.12 |