| Parameter |
Value |
| Designation |
C/2002 Q2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-08-17T18:46:31.782720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:19Z |
| Obs used |
166 |
| NEO |
- |
| M1 |
16.400 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-09-04.0000000 |
| e |
0.97789208 |
| q (au) |
1.303022 |
| a (au) |
58.939134 |
| i (deg) |
96.765213 |
| Ω (om, deg) |
154.285005 |
| ω (w, deg) |
125.472100 |
| M (ma, deg) |
0.037504 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.983 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.983 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
08:38:26.91 |
-56:14:58.6 |
HIP 42310 |
7.19 |
| 2026-07-29 12:00 |
08:38:31.85 |
-56:14:59.3 |
HIP 42310 |
7.87 |
| 2026-07-30 00:00 |
08:38:36.80 |
-56:15:00.4 |
HIP 42310 |
8.56 |
| 2026-07-30 12:00 |
08:38:41.74 |
-56:15:01.9 |
HIP 42310 |
9.24 |
| 2026-07-31 00:00 |
08:38:46.69 |
-56:15:03.6 |
HIP 42310 |
9.92 |
| 2026-07-31 12:00 |
08:38:51.63 |
-56:15:05.7 |
HIP 42310 |
10.61 |
| 2026-08-01 00:00 |
08:38:56.57 |
-56:15:08.1 |
HIP 42310 |
11.29 |
| 2026-08-01 12:00 |
08:39:01.51 |
-56:15:10.8 |
HIP 42310 |
11.97 |
| 2026-08-02 00:00 |
08:39:06.45 |
-56:15:13.9 |
HIP 42310 |
12.65 |
| 2026-08-02 12:00 |
08:39:11.39 |
-56:15:17.3 |
HIP 42310 |
13.34 |
| 2026-08-03 00:00 |
08:39:16.33 |
-56:15:21.0 |
HIP 42588 |
13.78 |
| 2026-08-03 12:00 |
08:39:21.26 |
-56:15:25.0 |
HIP 42588 |
13.18 |
| 2026-08-04 00:00 |
08:39:26.19 |
-56:15:29.4 |
HIP 42588 |
12.59 |
| 2026-08-04 12:00 |
08:39:31.12 |
-56:15:34.1 |
HIP 42588 |
12.01 |
| 2026-08-05 00:00 |
08:39:36.04 |
-56:15:39.1 |
HIP 42588 |
11.45 |
| 2026-08-05 12:00 |
08:39:40.96 |
-56:15:44.4 |
HIP 42588 |
10.90 |
| 2026-08-06 00:00 |
08:39:45.88 |
-56:15:50.1 |
HIP 42588 |
10.38 |
| 2026-08-06 12:00 |
08:39:50.79 |
-56:15:56.1 |
HIP 42588 |
9.88 |
| 2026-08-07 00:00 |
08:39:55.70 |
-56:16:02.4 |
HIP 42588 |
9.40 |
| 2026-08-07 12:00 |
08:40:00.60 |
-56:16:09.0 |
HIP 42588 |
8.96 |
| 2026-08-08 00:00 |
08:40:05.50 |
-56:16:16.0 |
HIP 42588 |
8.56 |
| 2026-08-08 12:00 |
08:40:10.40 |
-56:16:23.3 |
HIP 42588 |
8.20 |
| 2026-08-09 00:00 |
08:40:15.28 |
-56:16:30.9 |
HIP 42588 |
7.89 |
| 2026-08-09 12:00 |
08:40:20.16 |
-56:16:38.8 |
HIP 42588 |
7.64 |
| 2026-08-10 00:00 |
08:40:25.04 |
-56:16:47.1 |
HIP 42588 |
7.44 |
| 2026-08-10 12:00 |
08:40:29.91 |
-56:16:55.7 |
HIP 42588 |
7.31 |
| 2026-08-11 00:00 |
08:40:34.77 |
-56:17:04.6 |
HIP 42588 |
7.26 |
| 2026-08-11 12:00 |
08:40:39.62 |
-56:17:13.8 |
HIP 42588 |
7.27 |
| 2026-08-12 00:00 |
08:40:44.47 |
-56:17:23.3 |
HIP 42588 |
7.35 |
| 2026-08-12 12:00 |
08:40:49.30 |
-56:17:33.2 |
HIP 42588 |
7.50 |
| 2026-08-13 00:00 |
08:40:54.13 |
-56:17:43.4 |
HIP 42588 |
7.72 |
| 2026-08-13 12:00 |
08:40:58.95 |
-56:17:53.9 |
HIP 42588 |
8.00 |
| 2026-08-14 00:00 |
08:41:03.77 |
-56:18:04.7 |
HIP 42588 |
8.32 |
| 2026-08-14 12:00 |
08:41:08.57 |
-56:18:15.8 |
HIP 42588 |
8.70 |
| 2026-08-15 00:00 |
08:41:13.36 |
-56:18:27.3 |
HIP 42588 |
9.12 |
| 2026-08-15 12:00 |
08:41:18.14 |
-56:18:39.0 |
HIP 42588 |
9.57 |
| 2026-08-16 00:00 |
08:41:22.92 |
-56:18:51.1 |
HIP 42588 |
10.06 |
| 2026-08-16 12:00 |
08:41:27.68 |
-56:19:03.5 |
HIP 42588 |
10.57 |
| 2026-08-17 00:00 |
08:41:32.43 |
-56:19:16.2 |
HIP 42588 |
11.10 |
| 2026-08-17 12:00 |
08:41:37.17 |
-56:19:29.2 |
HIP 42588 |
11.66 |
| 2026-08-18 00:00 |
08:41:41.90 |
-56:19:42.6 |
HIP 42588 |
12.23 |
| 2026-08-18 12:00 |
08:41:46.61 |
-56:19:56.2 |
HIP 42588 |
12.82 |
| 2026-08-19 00:00 |
08:41:51.32 |
-56:20:10.1 |
HIP 42588 |
13.42 |