C/2002 Q3 (LINEAR)
| Parameter |
Value |
| Designation |
C/2002 Q3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-08-19T00:27:24.831360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:20Z |
| Obs used |
75 |
| NEO |
- |
| M1 |
17.100 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-08-29.0000000 |
| e |
0.99831744 |
| q (au) |
1.306123 |
| a (au) |
776.272581 |
| i (deg) |
96.895223 |
| Ω (om, deg) |
154.151313 |
| ω (w, deg) |
125.698640 |
| M (ma, deg) |
0.000455 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.038 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.038 |
| 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) |
| 2026-02-03 00:00 |
08:27:22.82 |
-61:19:31.6 |
HIP 41294 |
13.57 |
| 2026-02-03 12:00 |
08:27:17.51 |
-61:19:22.3 |
HIP 41294 |
12.95 |
| 2026-02-04 00:00 |
08:27:12.21 |
-61:19:12.6 |
HIP 41294 |
12.34 |
| 2026-02-04 12:00 |
08:27:06.92 |
-61:19:02.5 |
HIP 41294 |
11.74 |
| 2026-02-05 00:00 |
08:27:01.64 |
-61:18:52.1 |
HIP 41294 |
11.15 |
| 2026-02-05 12:00 |
08:26:56.37 |
-61:18:41.4 |
HIP 41294 |
10.56 |
| 2026-02-06 00:00 |
08:26:51.11 |
-61:18:30.3 |
HIP 41294 |
9.99 |
| 2026-02-06 12:00 |
08:26:45.86 |
-61:18:18.8 |
HIP 41294 |
9.43 |
| 2026-02-07 00:00 |
08:26:40.62 |
-61:18:07.0 |
HIP 41294 |
8.89 |
| 2026-02-07 12:00 |
08:26:35.40 |
-61:17:54.8 |
HIP 41294 |
8.37 |
| 2026-02-08 00:00 |
08:26:30.18 |
-61:17:42.3 |
HIP 41294 |
7.87 |
| 2026-02-08 12:00 |
08:26:24.98 |
-61:17:29.5 |
HIP 41294 |
7.40 |
| 2026-02-09 00:00 |
08:26:19.80 |
-61:17:16.3 |
HIP 41294 |
6.97 |
| 2026-02-09 12:00 |
08:26:14.63 |
-61:17:02.8 |
HIP 41294 |
6.58 |
| 2026-02-10 00:00 |
08:26:09.47 |
-61:16:48.9 |
HIP 41294 |
6.24 |
| 2026-02-10 12:00 |
08:26:04.32 |
-61:16:34.7 |
HIP 41294 |
5.96 |
| 2026-02-11 00:00 |
08:25:59.20 |
-61:16:20.1 |
HIP 41294 |
5.75 |
| 2026-02-11 12:00 |
08:25:54.09 |
-61:16:05.2 |
HIP 41294 |
5.61 |
| 2026-02-12 00:00 |
08:25:48.99 |
-61:15:49.9 |
HIP 41294 |
5.56 |
| 2026-02-12 12:00 |
08:25:43.91 |
-61:15:34.3 |
HIP 41294 |
5.59 |
| 2026-02-13 00:00 |
08:25:38.85 |
-61:15:18.4 |
HIP 41294 |
5.71 |
| 2026-02-13 12:00 |
08:25:33.80 |
-61:15:02.1 |
HIP 41294 |
5.90 |
| 2026-02-14 00:00 |
08:25:28.78 |
-61:14:45.5 |
HIP 41294 |
6.16 |
| 2026-02-14 12:00 |
08:25:23.77 |
-61:14:28.6 |
HIP 41294 |
6.49 |
| 2026-02-15 00:00 |
08:25:18.78 |
-61:14:11.3 |
HIP 41294 |
6.87 |
| 2026-02-15 12:00 |
08:25:13.81 |
-61:13:53.7 |
HIP 41294 |
7.30 |
| 2026-02-16 00:00 |
08:25:08.86 |
-61:13:35.8 |
HIP 41294 |
7.76 |
| 2026-02-16 12:00 |
08:25:03.93 |
-61:13:17.6 |
HIP 41294 |
8.26 |
| 2026-02-17 00:00 |
08:24:59.02 |
-61:12:59.0 |
HIP 41294 |
8.78 |
| 2026-02-17 12:00 |
08:24:54.14 |
-61:12:40.1 |
HIP 41294 |
9.32 |
| 2026-02-18 00:00 |
08:24:49.27 |
-61:12:20.8 |
HIP 41294 |
9.89 |
| 2026-02-18 12:00 |
08:24:44.42 |
-61:12:01.3 |
HIP 41294 |
10.47 |
| 2026-02-19 00:00 |
08:24:39.60 |
-61:11:41.4 |
HIP 41294 |
11.06 |
| 2026-02-19 12:00 |
08:24:34.80 |
-61:11:21.2 |
HIP 41294 |
11.66 |
| 2026-02-20 00:00 |
08:24:30.03 |
-61:11:00.7 |
HIP 41294 |
12.27 |
| 2026-02-20 12:00 |
08:24:25.28 |
-61:10:39.9 |
HIP 41294 |
12.89 |
| 2026-02-21 00:00 |
08:24:20.55 |
-61:10:18.8 |
HIP 41294 |
13.52 |
| 2026-02-21 12:00 |
08:24:15.85 |
-61:09:57.4 |
HIP 41294 |
14.15 |
| 2026-02-22 00:00 |
08:24:11.17 |
-61:09:35.6 |
HIP 41294 |
14.79 |
| 2026-02-22 12:00 |
08:24:06.52 |
-61:09:13.6 |
HIP 41294 |
15.43 |
| 2026-02-23 00:00 |
08:24:01.89 |
-61:08:51.2 |
HIP 41294 |
16.08 |
| 2026-02-23 12:00 |
08:23:57.29 |
-61:08:28.5 |
HIP 41294 |
16.73 |
| 2026-02-24 00:00 |
08:23:52.71 |
-61:08:05.6 |
HIP 41294 |
17.38 |