| Parameter |
Value |
| Designation |
C/2002 Q5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-11-19T04:48:24.062400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:20Z |
| Obs used |
571 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
5.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-10-27.0000000 |
| e |
1.00157521 |
| q (au) |
1.242967 |
| a (au) |
-789.082357 |
| i (deg) |
149.164230 |
| Ω (om, deg) |
33.747198 |
| ω (w, deg) |
133.306477 |
| M (ma, deg) |
-0.001032 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.974 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.974 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.951 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2002-08-28 |
2002-09-29 |
+21.0620 |
-4.420 |
| 2002-09-29 |
2002-11-04 |
-4.0688 |
-0.380 |
| 2002-12-25 |
2003-02-28 |
+2.5644 |
-3.204 |
| 2003-02-28 |
2003-05-30 |
-0.0497 |
-0.829 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
06:24:55.89 |
-04:01:06.6 |
HIP 30595 |
14.96 |
| 2026-07-29 12:00 |
06:24:57.98 |
-04:01:16.4 |
HIP 30595 |
14.60 |
| 2026-07-30 00:00 |
06:25:00.05 |
-04:01:26.3 |
HIP 30595 |
14.26 |
| 2026-07-30 12:00 |
06:25:02.12 |
-04:01:36.2 |
HIP 30595 |
13.94 |
| 2026-07-31 00:00 |
06:25:04.17 |
-04:01:46.4 |
HIP 30595 |
13.63 |
| 2026-07-31 12:00 |
06:25:06.22 |
-04:01:56.6 |
HIP 30595 |
13.35 |
| 2026-08-01 00:00 |
06:25:08.25 |
-04:02:06.9 |
HIP 30595 |
13.08 |
| 2026-08-01 12:00 |
06:25:10.27 |
-04:02:17.4 |
HIP 30595 |
12.83 |
| 2026-08-02 00:00 |
06:25:12.28 |
-04:02:28.0 |
HIP 30595 |
12.60 |
| 2026-08-02 12:00 |
06:25:14.28 |
-04:02:38.7 |
HIP 30595 |
12.40 |
| 2026-08-03 00:00 |
06:25:16.27 |
-04:02:49.5 |
HIP 30595 |
12.22 |
| 2026-08-03 12:00 |
06:25:18.24 |
-04:03:00.4 |
HIP 30595 |
12.06 |
| 2026-08-04 00:00 |
06:25:20.21 |
-04:03:11.4 |
HIP 30595 |
11.92 |
| 2026-08-04 12:00 |
06:25:22.16 |
-04:03:22.6 |
HIP 30595 |
11.81 |
| 2026-08-05 00:00 |
06:25:24.10 |
-04:03:33.9 |
HIP 30595 |
11.73 |
| 2026-08-05 12:00 |
06:25:26.02 |
-04:03:45.3 |
HIP 30595 |
11.67 |
| 2026-08-06 00:00 |
06:25:27.94 |
-04:03:56.7 |
HIP 30595 |
11.64 |
| 2026-08-06 12:00 |
06:25:29.84 |
-04:04:08.4 |
HIP 30595 |
11.63 |
| 2026-08-07 00:00 |
06:25:31.73 |
-04:04:20.1 |
HIP 30595 |
11.65 |
| 2026-08-07 12:00 |
06:25:33.60 |
-04:04:31.9 |
HIP 30595 |
11.69 |
| 2026-08-08 00:00 |
06:25:35.46 |
-04:04:43.8 |
HIP 30595 |
11.76 |
| 2026-08-08 12:00 |
06:25:37.31 |
-04:04:55.9 |
HIP 30595 |
11.85 |
| 2026-08-09 00:00 |
06:25:39.15 |
-04:05:08.0 |
HIP 30595 |
11.96 |
| 2026-08-09 12:00 |
06:25:40.97 |
-04:05:20.3 |
HIP 30595 |
12.10 |
| 2026-08-10 00:00 |
06:25:42.78 |
-04:05:32.7 |
HIP 30595 |
12.25 |
| 2026-08-10 12:00 |
06:25:44.57 |
-04:05:45.1 |
HIP 30595 |
12.43 |
| 2026-08-11 00:00 |
06:25:46.35 |
-04:05:57.7 |
HIP 30595 |
12.62 |
| 2026-08-11 12:00 |
06:25:48.12 |
-04:06:10.4 |
HIP 30595 |
12.83 |
| 2026-08-12 00:00 |
06:25:49.87 |
-04:06:23.2 |
HIP 30595 |
13.06 |
| 2026-08-12 12:00 |
06:25:51.61 |
-04:06:36.1 |
HIP 30595 |
13.31 |
| 2026-08-13 00:00 |
06:25:53.33 |
-04:06:49.1 |
HIP 30595 |
13.56 |
| 2026-08-13 12:00 |
06:25:55.04 |
-04:07:02.2 |
HIP 30595 |
13.84 |
| 2026-08-14 00:00 |
06:25:56.73 |
-04:07:15.4 |
HIP 30595 |
14.12 |
| 2026-08-14 12:00 |
06:25:58.41 |
-04:07:28.6 |
HIP 30595 |
14.41 |
| 2026-08-15 00:00 |
06:26:00.07 |
-04:07:42.0 |
HIP 30595 |
14.72 |
| 2026-08-15 12:00 |
06:26:01.72 |
-04:07:55.5 |
HIP 30595 |
15.03 |
| 2026-08-16 00:00 |
06:26:03.35 |
-04:08:09.1 |
HIP 30595 |
15.35 |
| 2026-08-16 12:00 |
06:26:04.97 |
-04:08:22.8 |
HIP 30595 |
15.68 |
| 2026-08-17 00:00 |
06:26:06.57 |
-04:08:36.5 |
HIP 30595 |
16.02 |
| 2026-08-17 12:00 |
06:26:08.15 |
-04:08:50.4 |
HIP 30595 |
16.36 |
| 2026-08-18 00:00 |
06:26:09.72 |
-04:09:04.3 |
HIP 30595 |
16.71 |
| 2026-08-18 12:00 |
06:26:11.27 |
-04:09:18.4 |
HIP 30595 |
17.06 |
| 2026-08-19 00:00 |
06:26:12.81 |
-04:09:32.5 |
HIP 30700 |
16.82 |