| Parameter |
Value |
| Designation |
C/2002 C2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-04-10T19:34:16.780800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:14Z |
| Obs used |
206 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-05-23.0000000 |
| e |
0.99964080 |
| q (au) |
3.253749 |
| a (au) |
9058.346432 |
| i (deg) |
104.881376 |
| Ω (om, deg) |
242.955998 |
| ω (w, deg) |
159.933817 |
| M (ma, deg) |
0.000048 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.703 + 5.569\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.703 |
| n |
5.569 |
| gf |
1.000 |
| gb |
-0.626 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
16:58:12.35 |
-72:37:01.5 |
HIP 82823 |
17.50 |
| 2026-03-26 12:00 |
16:58:09.28 |
-72:37:28.0 |
HIP 82823 |
17.02 |
| 2026-03-27 00:00 |
16:58:06.12 |
-72:37:54.3 |
HIP 82823 |
16.54 |
| 2026-03-27 12:00 |
16:58:02.90 |
-72:38:20.6 |
HIP 82823 |
16.05 |
| 2026-03-28 00:00 |
16:57:59.59 |
-72:38:46.7 |
HIP 82823 |
15.57 |
| 2026-03-28 12:00 |
16:57:56.21 |
-72:39:12.7 |
HIP 82823 |
15.08 |
| 2026-03-29 00:00 |
16:57:52.76 |
-72:39:38.5 |
HIP 82823 |
14.59 |
| 2026-03-29 12:00 |
16:57:49.23 |
-72:40:04.3 |
HIP 82823 |
14.10 |
| 2026-03-30 00:00 |
16:57:45.62 |
-72:40:29.9 |
HIP 82823 |
13.61 |
| 2026-03-30 12:00 |
16:57:41.94 |
-72:40:55.4 |
HIP 82823 |
13.12 |
| 2026-03-31 00:00 |
16:57:38.18 |
-72:41:20.7 |
HIP 82823 |
12.63 |
| 2026-03-31 12:00 |
16:57:34.35 |
-72:41:46.0 |
HIP 82823 |
12.13 |
| 2026-04-01 00:00 |
16:57:30.44 |
-72:42:11.1 |
HIP 82823 |
11.64 |
| 2026-04-01 12:00 |
16:57:26.46 |
-72:42:36.0 |
HIP 82823 |
11.14 |
| 2026-04-02 00:00 |
16:57:22.41 |
-72:43:00.8 |
HIP 82823 |
10.64 |
| 2026-04-02 12:00 |
16:57:18.28 |
-72:43:25.5 |
HIP 82823 |
10.14 |
| 2026-04-03 00:00 |
16:57:14.08 |
-72:43:50.0 |
HIP 82823 |
9.64 |
| 2026-04-03 12:00 |
16:57:09.80 |
-72:44:14.4 |
HIP 82823 |
9.14 |
| 2026-04-04 00:00 |
16:57:05.46 |
-72:44:38.6 |
HIP 82823 |
8.63 |
| 2026-04-04 12:00 |
16:57:01.03 |
-72:45:02.7 |
HIP 82823 |
8.13 |
| 2026-04-05 00:00 |
16:56:56.54 |
-72:45:26.6 |
HIP 82823 |
7.62 |
| 2026-04-05 12:00 |
16:56:51.97 |
-72:45:50.4 |
HIP 82823 |
7.12 |
| 2026-04-06 00:00 |
16:56:47.33 |
-72:46:14.0 |
HIP 82823 |
6.61 |
| 2026-04-06 12:00 |
16:56:42.62 |
-72:46:37.5 |
HIP 82823 |
6.10 |
| 2026-04-07 00:00 |
16:56:37.84 |
-72:47:00.7 |
HIP 82823 |
5.60 |
| 2026-04-07 12:00 |
16:56:32.99 |
-72:47:23.9 |
HIP 82823 |
5.09 |
| 2026-04-08 00:00 |
16:56:28.06 |
-72:47:46.8 |
HIP 82823 |
4.58 |
| 2026-04-08 12:00 |
16:56:23.07 |
-72:48:09.6 |
HIP 82823 |
4.08 |
| 2026-04-09 00:00 |
16:56:18.00 |
-72:48:32.3 |
HIP 82823 |
3.58 |
| 2026-04-09 12:00 |
16:56:12.87 |
-72:48:54.7 |
HIP 82823 |
3.10 |
| 2026-04-10 00:00 |
16:56:07.66 |
-72:49:17.0 |
HIP 82823 |
2.62 |
| 2026-04-10 12:00 |
16:56:02.38 |
-72:49:39.1 |
HIP 82823 |
2.16 |
| 2026-04-11 00:00 |
16:55:57.04 |
-72:50:01.0 |
HIP 82823 |
1.75 |
| 2026-04-11 12:00 |
16:55:51.63 |
-72:50:22.7 |
HIP 82823 |
1.42 |
| 2026-04-12 00:00 |
16:55:46.14 |
-72:50:44.3 |
HIP 82823 |
1.23 |
| 2026-04-12 12:00 |
16:55:40.59 |
-72:51:05.7 |
HIP 82823 |
1.27 |
| 2026-04-13 00:00 |
16:55:34.97 |
-72:51:26.9 |
HIP 82823 |
1.51 |
| 2026-04-13 12:00 |
16:55:29.29 |
-72:51:47.8 |
HIP 82823 |
1.88 |
| 2026-04-14 00:00 |
16:55:23.54 |
-72:52:08.6 |
HIP 82823 |
2.32 |
| 2026-04-14 12:00 |
16:55:17.72 |
-72:52:29.2 |
HIP 82823 |
2.79 |
| 2026-04-15 00:00 |
16:55:11.83 |
-72:52:49.7 |
HIP 82823 |
3.29 |
| 2026-04-15 12:00 |
16:55:05.88 |
-72:53:09.9 |
HIP 82823 |
3.80 |
| 2026-04-16 00:00 |
16:54:59.86 |
-72:53:29.9 |
HIP 82823 |
4.33 |