| Parameter |
Value |
| Designation |
C/2002 U2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-12-31T23:39:13.196160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:22Z |
| Obs used |
372 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-01-02.0000000 |
| e |
1.00004468 |
| q (au) |
1.208632 |
| a (au) |
-27048.498281 |
| i (deg) |
59.135691 |
| Ω (om, deg) |
38.776625 |
| ω (w, deg) |
95.846952 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.157 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.157 |
| n |
6.000 |
| gf |
0.984 |
| gb |
-0.818 |
| k |
0.997 |
| δ90 |
9.691 |
| 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) |
| 2026-07-29 00:00 |
20:50:33.17 |
-79:12:46.3 |
HIP 102428 |
16.44 |
| 2026-07-29 12:00 |
20:50:20.18 |
-79:12:53.4 |
HIP 102428 |
15.95 |
| 2026-07-30 00:00 |
20:50:07.19 |
-79:13:00.2 |
HIP 102428 |
15.47 |
| 2026-07-30 12:00 |
20:49:54.18 |
-79:13:06.6 |
HIP 102428 |
15.00 |
| 2026-07-31 00:00 |
20:49:41.17 |
-79:13:12.7 |
HIP 102428 |
14.53 |
| 2026-07-31 12:00 |
20:49:28.15 |
-79:13:18.5 |
HIP 102428 |
14.07 |
| 2026-08-01 00:00 |
20:49:15.12 |
-79:13:23.9 |
HIP 102428 |
13.62 |
| 2026-08-01 12:00 |
20:49:02.09 |
-79:13:29.1 |
HIP 102428 |
13.18 |
| 2026-08-02 00:00 |
20:48:49.06 |
-79:13:33.9 |
HIP 102428 |
12.75 |
| 2026-08-02 12:00 |
20:48:36.02 |
-79:13:38.3 |
HIP 102428 |
12.33 |
| 2026-08-03 00:00 |
20:48:22.99 |
-79:13:42.5 |
HIP 102428 |
11.93 |
| 2026-08-03 12:00 |
20:48:09.95 |
-79:13:46.3 |
HIP 102428 |
11.55 |
| 2026-08-04 00:00 |
20:47:56.92 |
-79:13:49.8 |
HIP 102428 |
11.18 |
| 2026-08-04 12:00 |
20:47:43.89 |
-79:13:53.0 |
HIP 102428 |
10.83 |
| 2026-08-05 00:00 |
20:47:30.86 |
-79:13:55.8 |
HIP 102428 |
10.49 |
| 2026-08-05 12:00 |
20:47:17.84 |
-79:13:58.4 |
HIP 102428 |
10.18 |
| 2026-08-06 00:00 |
20:47:04.82 |
-79:14:00.6 |
HIP 102428 |
9.90 |
| 2026-08-06 12:00 |
20:46:51.82 |
-79:14:02.4 |
HIP 102428 |
9.64 |
| 2026-08-07 00:00 |
20:46:38.82 |
-79:14:03.9 |
HIP 102428 |
9.41 |
| 2026-08-07 12:00 |
20:46:25.83 |
-79:14:05.1 |
HIP 102428 |
9.20 |
| 2026-08-08 00:00 |
20:46:12.86 |
-79:14:06.0 |
HIP 102428 |
9.03 |
| 2026-08-08 12:00 |
20:45:59.90 |
-79:14:06.6 |
HIP 102428 |
8.90 |
| 2026-08-09 00:00 |
20:45:46.95 |
-79:14:06.8 |
HIP 102428 |
8.79 |
| 2026-08-09 12:00 |
20:45:34.02 |
-79:14:06.6 |
HIP 102428 |
8.73 |
| 2026-08-10 00:00 |
20:45:21.11 |
-79:14:06.2 |
HIP 102428 |
8.70 |
| 2026-08-10 12:00 |
20:45:08.22 |
-79:14:05.4 |
HIP 102428 |
8.71 |
| 2026-08-11 00:00 |
20:44:55.34 |
-79:14:04.3 |
HIP 102428 |
8.75 |
| 2026-08-11 12:00 |
20:44:42.49 |
-79:14:02.9 |
HIP 102428 |
8.83 |
| 2026-08-12 00:00 |
20:44:29.66 |
-79:14:01.1 |
HIP 102428 |
8.94 |
| 2026-08-12 12:00 |
20:44:16.86 |
-79:13:59.0 |
HIP 102428 |
9.09 |
| 2026-08-13 00:00 |
20:44:04.08 |
-79:13:56.6 |
HIP 102428 |
9.27 |
| 2026-08-13 12:00 |
20:43:51.33 |
-79:13:53.8 |
HIP 102428 |
9.47 |
| 2026-08-14 00:00 |
20:43:38.60 |
-79:13:50.7 |
HIP 102428 |
9.71 |
| 2026-08-14 12:00 |
20:43:25.91 |
-79:13:47.3 |
HIP 102428 |
9.97 |
| 2026-08-15 00:00 |
20:43:13.25 |
-79:13:43.6 |
HIP 102428 |
10.25 |
| 2026-08-15 12:00 |
20:43:00.61 |
-79:13:39.5 |
HIP 102428 |
10.56 |
| 2026-08-16 00:00 |
20:42:48.02 |
-79:13:35.1 |
HIP 102428 |
10.88 |
| 2026-08-16 12:00 |
20:42:35.46 |
-79:13:30.4 |
HIP 102428 |
11.23 |
| 2026-08-17 00:00 |
20:42:22.93 |
-79:13:25.4 |
HIP 102428 |
11.58 |
| 2026-08-17 12:00 |
20:42:10.44 |
-79:13:20.0 |
HIP 102428 |
11.96 |
| 2026-08-18 00:00 |
20:41:57.99 |
-79:13:14.3 |
HIP 102428 |
12.34 |
| 2026-08-18 12:00 |
20:41:45.58 |
-79:13:08.3 |
HIP 102428 |
12.74 |
| 2026-08-19 00:00 |
20:41:33.22 |
-79:13:02.0 |
HIP 102428 |
13.14 |