| 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 |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
18:37:37.87 |
-69:12:43.8 |
HIP 91221 |
9.94 |
| 2026-09-20 12:00 |
18:37:36.26 |
-69:12:17.5 |
HIP 91221 |
9.51 |
| 2026-09-21 00:00 |
18:37:34.71 |
-69:11:51.1 |
HIP 91221 |
9.08 |
| 2026-09-21 12:00 |
18:37:33.23 |
-69:11:24.7 |
HIP 91221 |
8.66 |
| 2026-09-22 00:00 |
18:37:31.82 |
-69:10:58.2 |
HIP 91221 |
8.25 |
| 2026-09-22 12:00 |
18:37:30.48 |
-69:10:31.7 |
HIP 91221 |
7.85 |
| 2026-09-23 00:00 |
18:37:29.20 |
-69:10:05.2 |
HIP 91221 |
7.45 |
| 2026-09-23 12:00 |
18:37:27.98 |
-69:09:38.5 |
HIP 91221 |
7.07 |
| 2026-09-24 00:00 |
18:37:26.84 |
-69:09:11.9 |
HIP 91221 |
6.71 |
| 2026-09-24 12:00 |
18:37:25.76 |
-69:08:45.2 |
HIP 91221 |
6.35 |
| 2026-09-25 00:00 |
18:37:24.75 |
-69:08:18.4 |
HIP 91221 |
6.02 |
| 2026-09-25 12:00 |
18:37:23.80 |
-69:07:51.7 |
HIP 91221 |
5.71 |
| 2026-09-26 00:00 |
18:37:22.92 |
-69:07:24.9 |
HIP 91221 |
5.42 |
| 2026-09-26 12:00 |
18:37:22.11 |
-69:06:58.0 |
HIP 91221 |
5.16 |
| 2026-09-27 00:00 |
18:37:21.37 |
-69:06:31.1 |
HIP 91221 |
4.94 |
| 2026-09-27 12:00 |
18:37:20.69 |
-69:06:04.2 |
HIP 91221 |
4.75 |
| 2026-09-28 00:00 |
18:37:20.07 |
-69:05:37.3 |
HIP 91221 |
4.61 |
| 2026-09-28 12:00 |
18:37:19.53 |
-69:05:10.4 |
HIP 91221 |
4.51 |
| 2026-09-29 00:00 |
18:37:19.05 |
-69:04:43.4 |
HIP 91221 |
4.47 |
| 2026-09-29 12:00 |
18:37:18.63 |
-69:04:16.4 |
HIP 91221 |
4.47 |
| 2026-09-30 00:00 |
18:37:18.28 |
-69:03:49.4 |
HIP 91221 |
4.53 |
| 2026-09-30 12:00 |
18:37:18.00 |
-69:03:22.3 |
HIP 91221 |
4.63 |
| 2026-10-01 00:00 |
18:37:17.78 |
-69:02:55.3 |
HIP 91221 |
4.78 |
| 2026-10-01 12:00 |
18:37:17.64 |
-69:02:28.2 |
HIP 91221 |
4.98 |
| 2026-10-02 00:00 |
18:37:17.55 |
-69:02:01.2 |
HIP 91221 |
5.21 |
| 2026-10-02 12:00 |
18:37:17.53 |
-69:01:34.1 |
HIP 91221 |
5.47 |
| 2026-10-03 00:00 |
18:37:17.58 |
-69:01:07.0 |
HIP 91221 |
5.76 |
| 2026-10-03 12:00 |
18:37:17.70 |
-69:00:39.9 |
HIP 91221 |
6.07 |
| 2026-10-04 00:00 |
18:37:17.88 |
-69:00:12.9 |
HIP 91221 |
6.41 |
| 2026-10-04 12:00 |
18:37:18.12 |
-68:59:45.8 |
HIP 91221 |
6.76 |
| 2026-10-05 00:00 |
18:37:18.44 |
-68:59:18.7 |
HIP 91221 |
7.13 |
| 2026-10-05 12:00 |
18:37:18.81 |
-68:58:51.6 |
HIP 91221 |
7.51 |
| 2026-10-06 00:00 |
18:37:19.26 |
-68:58:24.5 |
HIP 91221 |
7.90 |
| 2026-10-06 12:00 |
18:37:19.77 |
-68:57:57.5 |
HIP 91221 |
8.30 |
| 2026-10-07 00:00 |
18:37:20.34 |
-68:57:30.4 |
HIP 91221 |
8.71 |
| 2026-10-07 12:00 |
18:37:20.98 |
-68:57:03.4 |
HIP 91221 |
9.12 |
| 2026-10-08 00:00 |
18:37:21.69 |
-68:56:36.4 |
HIP 91221 |
9.54 |
| 2026-10-08 12:00 |
18:37:22.46 |
-68:56:09.4 |
HIP 91221 |
9.97 |
| 2026-10-09 00:00 |
18:37:23.29 |
-68:55:42.4 |
HIP 91221 |
10.40 |
| 2026-10-09 12:00 |
18:37:24.19 |
-68:55:15.4 |
HIP 91221 |
10.84 |
| 2026-10-10 00:00 |
18:37:25.16 |
-68:54:48.5 |
HIP 91221 |
11.28 |
| 2026-10-10 12:00 |
18:37:26.19 |
-68:54:21.6 |
HIP 91221 |
11.72 |
| 2026-10-11 00:00 |
18:37:27.28 |
-68:53:54.7 |
HIP 91221 |
12.17 |