C/2002 Q5 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
06:19:41.00 |
-04:58:56.9 |
HIP 29998 |
13.35 |
| 2026-02-03 12:00 |
06:19:38.79 |
-04:58:43.3 |
HIP 29998 |
12.92 |
| 2026-02-04 00:00 |
06:19:36.60 |
-04:58:29.6 |
HIP 29998 |
12.52 |
| 2026-02-04 12:00 |
06:19:34.43 |
-04:58:15.7 |
HIP 29998 |
12.14 |
| 2026-02-05 00:00 |
06:19:32.28 |
-04:58:01.7 |
HIP 29998 |
11.78 |
| 2026-02-05 12:00 |
06:19:30.14 |
-04:57:47.6 |
HIP 29998 |
11.44 |
| 2026-02-06 00:00 |
06:19:28.02 |
-04:57:33.4 |
HIP 29998 |
11.12 |
| 2026-02-06 12:00 |
06:19:25.91 |
-04:57:19.1 |
HIP 29998 |
10.84 |
| 2026-02-07 00:00 |
06:19:23.82 |
-04:57:04.7 |
HIP 29998 |
10.58 |
| 2026-02-07 12:00 |
06:19:21.75 |
-04:56:50.1 |
HIP 29998 |
10.35 |
| 2026-02-08 00:00 |
06:19:19.69 |
-04:56:35.5 |
HIP 29998 |
10.15 |
| 2026-02-08 12:00 |
06:19:17.66 |
-04:56:20.7 |
HIP 29998 |
9.98 |
| 2026-02-09 00:00 |
06:19:15.64 |
-04:56:05.8 |
HIP 29998 |
9.85 |
| 2026-02-09 12:00 |
06:19:13.63 |
-04:55:50.8 |
HIP 29998 |
9.75 |
| 2026-02-10 00:00 |
06:19:11.65 |
-04:55:35.7 |
HIP 29998 |
9.69 |
| 2026-02-10 12:00 |
06:19:09.68 |
-04:55:20.5 |
HIP 29998 |
9.66 |
| 2026-02-11 00:00 |
06:19:07.73 |
-04:55:05.2 |
HIP 29998 |
9.67 |
| 2026-02-11 12:00 |
06:19:05.80 |
-04:54:49.9 |
HIP 29998 |
9.71 |
| 2026-02-12 00:00 |
06:19:03.89 |
-04:54:34.4 |
HIP 29998 |
9.78 |
| 2026-02-12 12:00 |
06:19:01.99 |
-04:54:18.8 |
HIP 29998 |
9.89 |
| 2026-02-13 00:00 |
06:19:00.11 |
-04:54:03.1 |
HIP 29998 |
10.03 |
| 2026-02-13 12:00 |
06:18:58.26 |
-04:53:47.3 |
HIP 29998 |
10.19 |
| 2026-02-14 00:00 |
06:18:56.42 |
-04:53:31.4 |
HIP 29998 |
10.38 |
| 2026-02-14 12:00 |
06:18:54.60 |
-04:53:15.4 |
HIP 29998 |
10.60 |
| 2026-02-15 00:00 |
06:18:52.80 |
-04:52:59.3 |
HIP 29998 |
10.84 |
| 2026-02-15 12:00 |
06:18:51.02 |
-04:52:43.2 |
HIP 29998 |
11.10 |
| 2026-02-16 00:00 |
06:18:49.25 |
-04:52:26.9 |
HIP 29998 |
11.38 |
| 2026-02-16 12:00 |
06:18:47.51 |
-04:52:10.5 |
HIP 29998 |
11.68 |
| 2026-02-17 00:00 |
06:18:45.79 |
-04:51:54.1 |
HIP 29998 |
11.99 |
| 2026-02-17 12:00 |
06:18:44.09 |
-04:51:37.6 |
HIP 29998 |
12.32 |
| 2026-02-18 00:00 |
06:18:42.40 |
-04:51:21.0 |
HIP 29998 |
12.66 |
| 2026-02-18 12:00 |
06:18:40.74 |
-04:51:04.3 |
HIP 29998 |
13.01 |
| 2026-02-19 00:00 |
06:18:39.10 |
-04:50:47.5 |
HIP 29998 |
13.37 |
| 2026-02-19 12:00 |
06:18:37.47 |
-04:50:30.7 |
HIP 29998 |
13.74 |
| 2026-02-20 00:00 |
06:18:35.87 |
-04:50:13.8 |
HIP 29998 |
14.11 |
| 2026-02-20 12:00 |
06:18:34.29 |
-04:49:56.8 |
HIP 29998 |
14.49 |
| 2026-02-21 00:00 |
06:18:32.73 |
-04:49:39.7 |
HIP 29998 |
14.88 |
| 2026-02-21 12:00 |
06:18:31.18 |
-04:49:22.5 |
HIP 29998 |
15.28 |
| 2026-02-22 00:00 |
06:18:29.66 |
-04:49:05.3 |
HIP 29998 |
15.67 |
| 2026-02-22 12:00 |
06:18:28.16 |
-04:48:48.0 |
HIP 29998 |
16.07 |
| 2026-02-23 00:00 |
06:18:26.69 |
-04:48:30.6 |
HIP 29998 |
16.48 |
| 2026-02-23 12:00 |
06:18:25.23 |
-04:48:13.2 |
HIP 29998 |
16.88 |
| 2026-02-24 00:00 |
06:18:23.79 |
-04:47:55.7 |
HIP 29998 |
17.29 |