C/2002 U2 (LINEAR)
| 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 |
9.697 |
| 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 |
20:47:48.24 |
-77:00:19.5 |
HIP 102259 |
31.67 |
| 2026-02-03 12:00 |
20:48:00.10 |
-77:00:16.4 |
HIP 102259 |
31.96 |
| 2026-02-04 00:00 |
20:48:11.94 |
-77:00:13.6 |
HIP 102259 |
32.28 |
| 2026-02-04 12:00 |
20:48:23.78 |
-77:00:11.1 |
HIP 102259 |
32.60 |
| 2026-02-05 00:00 |
20:48:35.61 |
-77:00:08.8 |
HIP 102259 |
32.94 |
| 2026-02-05 12:00 |
20:48:47.43 |
-77:00:06.8 |
HIP 102259 |
33.30 |
| 2026-02-06 00:00 |
20:48:59.23 |
-77:00:05.0 |
HIP 102259 |
33.67 |
| 2026-02-06 12:00 |
20:49:11.03 |
-77:00:03.6 |
HIP 102259 |
34.05 |
| 2026-02-07 00:00 |
20:49:22.81 |
-77:00:02.4 |
HIP 102259 |
34.44 |
| 2026-02-07 12:00 |
20:49:34.57 |
-77:00:01.4 |
HIP 102259 |
34.85 |
| 2026-02-08 00:00 |
20:49:46.32 |
-77:00:00.8 |
HIP 102259 |
35.26 |
| 2026-02-08 12:00 |
20:49:58.06 |
-77:00:00.4 |
HIP 102259 |
35.69 |
| 2026-02-09 00:00 |
20:50:09.78 |
-77:00:00.3 |
HIP 102259 |
36.12 |
| 2026-02-09 12:00 |
20:50:21.49 |
-77:00:00.4 |
HIP 102259 |
36.57 |
| 2026-02-10 00:00 |
20:50:33.18 |
-77:00:00.9 |
HIP 102259 |
37.03 |
| 2026-02-10 12:00 |
20:50:44.85 |
-77:00:01.6 |
HIP 102259 |
37.49 |
| 2026-02-11 00:00 |
20:50:56.51 |
-77:00:02.6 |
HIP 102259 |
37.96 |
| 2026-02-11 12:00 |
20:51:08.14 |
-77:00:03.8 |
HIP 102259 |
38.45 |
| 2026-02-12 00:00 |
20:51:19.76 |
-77:00:05.3 |
HIP 102259 |
38.93 |
| 2026-02-12 12:00 |
20:51:31.36 |
-77:00:07.1 |
HIP 102259 |
39.43 |
| 2026-02-13 00:00 |
20:51:42.93 |
-77:00:09.2 |
HIP 102259 |
39.93 |
| 2026-02-13 12:00 |
20:51:54.49 |
-77:00:11.5 |
HIP 102259 |
40.44 |
| 2026-02-14 00:00 |
20:52:06.02 |
-77:00:14.2 |
HIP 102259 |
40.96 |
| 2026-02-14 12:00 |
20:52:17.53 |
-77:00:17.0 |
HIP 102259 |
41.48 |
| 2026-02-15 00:00 |
20:52:29.02 |
-77:00:20.2 |
HIP 104043 |
41.24 |
| 2026-02-15 12:00 |
20:52:40.48 |
-77:00:23.6 |
HIP 104043 |
40.60 |
| 2026-02-16 00:00 |
20:52:51.92 |
-77:00:27.3 |
HIP 104043 |
39.95 |
| 2026-02-16 12:00 |
20:53:03.33 |
-77:00:31.3 |
HIP 104043 |
39.31 |
| 2026-02-17 00:00 |
20:53:14.72 |
-77:00:35.6 |
HIP 104043 |
38.66 |
| 2026-02-17 12:00 |
20:53:26.08 |
-77:00:40.1 |
HIP 104043 |
38.02 |
| 2026-02-18 00:00 |
20:53:37.42 |
-77:00:44.9 |
HIP 104043 |
37.38 |
| 2026-02-18 12:00 |
20:53:48.72 |
-77:00:50.0 |
HIP 104043 |
36.75 |
| 2026-02-19 00:00 |
20:54:00.00 |
-77:00:55.3 |
HIP 104043 |
36.11 |
| 2026-02-19 12:00 |
20:54:11.25 |
-77:01:00.9 |
HIP 104043 |
35.48 |
| 2026-02-20 00:00 |
20:54:22.47 |
-77:01:06.8 |
HIP 104043 |
34.84 |
| 2026-02-20 12:00 |
20:54:33.65 |
-77:01:13.0 |
HIP 104043 |
34.21 |
| 2026-02-21 00:00 |
20:54:44.81 |
-77:01:19.4 |
HIP 104043 |
33.58 |
| 2026-02-21 12:00 |
20:54:55.93 |
-77:01:26.1 |
HIP 104043 |
32.96 |
| 2026-02-22 00:00 |
20:55:07.02 |
-77:01:33.1 |
HIP 104043 |
32.33 |
| 2026-02-22 12:00 |
20:55:18.08 |
-77:01:40.3 |
HIP 104043 |
31.71 |
| 2026-02-23 00:00 |
20:55:29.11 |
-77:01:47.8 |
HIP 104043 |
31.09 |
| 2026-02-23 12:00 |
20:55:40.10 |
-77:01:55.6 |
HIP 104043 |
30.47 |
| 2026-02-24 00:00 |
20:55:51.05 |
-77:02:03.7 |
HIP 104043 |
29.86 |