C/2002 O7 (LINEAR)
| Parameter |
Value |
| Designation |
C/2002 O7 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-09-22T13:43:12.020160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:18Z |
| Obs used |
1606 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-07.0000000 |
| e |
1.00027490 |
| q (au) |
0.903322 |
| a (au) |
-3285.990387 |
| i (deg) |
98.743371 |
| Ω (om, deg) |
12.803602 |
| ω (w, deg) |
252.068643 |
| M (ma, deg) |
-0.000882 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.219 + 3.450\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.219 |
| n |
3.450 |
| gf |
1.000 |
| gb |
-0.894 |
| k |
0.959 |
| 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 |
| 2002-07-29 |
2003-07-27 |
+1.7590 |
-1.083 |
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 |
22:02:42.68 |
+47:21:41.4 |
HIP 108837 |
10.92 |
| 2026-02-03 12:00 |
22:02:46.21 |
+47:21:40.2 |
HIP 108837 |
10.85 |
| 2026-02-04 00:00 |
22:02:49.75 |
+47:21:39.4 |
HIP 108837 |
10.82 |
| 2026-02-04 12:00 |
22:02:53.30 |
+47:21:38.8 |
HIP 108837 |
10.81 |
| 2026-02-05 00:00 |
22:02:56.86 |
+47:21:38.5 |
HIP 108837 |
10.84 |
| 2026-02-05 12:00 |
22:03:00.42 |
+47:21:38.6 |
HIP 108837 |
10.89 |
| 2026-02-06 00:00 |
22:03:03.99 |
+47:21:38.9 |
HIP 108837 |
10.96 |
| 2026-02-06 12:00 |
22:03:07.57 |
+47:21:39.6 |
HIP 108837 |
11.07 |
| 2026-02-07 00:00 |
22:03:11.15 |
+47:21:40.6 |
HIP 108837 |
11.20 |
| 2026-02-07 12:00 |
22:03:14.73 |
+47:21:41.8 |
HIP 108837 |
11.36 |
| 2026-02-08 00:00 |
22:03:18.32 |
+47:21:43.4 |
HIP 108837 |
11.55 |
| 2026-02-08 12:00 |
22:03:21.92 |
+47:21:45.3 |
HIP 108837 |
11.76 |
| 2026-02-09 00:00 |
22:03:25.52 |
+47:21:47.4 |
HIP 108837 |
11.99 |
| 2026-02-09 12:00 |
22:03:29.13 |
+47:21:49.9 |
HIP 108837 |
12.24 |
| 2026-02-10 00:00 |
22:03:32.73 |
+47:21:52.7 |
HIP 108989 |
12.43 |
| 2026-02-10 12:00 |
22:03:36.35 |
+47:21:55.8 |
HIP 108989 |
11.82 |
| 2026-02-11 00:00 |
22:03:39.97 |
+47:21:59.1 |
HIP 108989 |
11.21 |
| 2026-02-11 12:00 |
22:03:43.59 |
+47:22:02.8 |
HIP 108989 |
10.59 |
| 2026-02-12 00:00 |
22:03:47.21 |
+47:22:06.8 |
HIP 108989 |
9.98 |
| 2026-02-12 12:00 |
22:03:50.84 |
+47:22:11.1 |
HIP 108989 |
9.37 |
| 2026-02-13 00:00 |
22:03:54.46 |
+47:22:15.7 |
HIP 108989 |
8.76 |
| 2026-02-13 12:00 |
22:03:58.10 |
+47:22:20.6 |
HIP 108989 |
8.15 |
| 2026-02-14 00:00 |
22:04:01.73 |
+47:22:25.8 |
HIP 108989 |
7.54 |
| 2026-02-14 12:00 |
22:04:05.36 |
+47:22:31.2 |
HIP 108989 |
6.93 |
| 2026-02-15 00:00 |
22:04:09.00 |
+47:22:37.0 |
HIP 108989 |
6.33 |
| 2026-02-15 12:00 |
22:04:12.64 |
+47:22:43.1 |
HIP 108989 |
5.74 |
| 2026-02-16 00:00 |
22:04:16.28 |
+47:22:49.5 |
HIP 108989 |
5.15 |
| 2026-02-16 12:00 |
22:04:19.92 |
+47:22:56.2 |
HIP 108989 |
4.57 |
| 2026-02-17 00:00 |
22:04:23.56 |
+47:23:03.2 |
HIP 108989 |
4.00 |
| 2026-02-17 12:00 |
22:04:27.20 |
+47:23:10.4 |
HIP 108989 |
3.47 |
| 2026-02-18 00:00 |
22:04:30.83 |
+47:23:18.0 |
HIP 108989 |
2.96 |
| 2026-02-18 12:00 |
22:04:34.47 |
+47:23:25.9 |
HIP 108989 |
2.52 |
| 2026-02-19 00:00 |
22:04:38.11 |
+47:23:34.0 |
HIP 108989 |
2.18 |
| 2026-02-19 12:00 |
22:04:41.75 |
+47:23:42.5 |
HIP 108989 |
1.99 |
| 2026-02-20 00:00 |
22:04:45.39 |
+47:23:51.3 |
HIP 108989 |
2.00 |
| 2026-02-20 12:00 |
22:04:49.02 |
+47:24:00.3 |
HIP 108989 |
2.20 |
| 2026-02-21 00:00 |
22:04:52.65 |
+47:24:09.6 |
HIP 108989 |
2.55 |
| 2026-02-21 12:00 |
22:04:56.28 |
+47:24:19.2 |
HIP 108989 |
3.00 |
| 2026-02-22 00:00 |
22:04:59.91 |
+47:24:29.2 |
HIP 108989 |
3.51 |
| 2026-02-22 12:00 |
22:05:03.54 |
+47:24:39.4 |
HIP 108989 |
4.06 |
| 2026-02-23 00:00 |
22:05:07.16 |
+47:24:49.8 |
HIP 108989 |
4.64 |
| 2026-02-23 12:00 |
22:05:10.78 |
+47:25:00.6 |
HIP 108989 |
5.23 |
| 2026-02-24 00:00 |
22:05:14.40 |
+47:25:11.7 |
HIP 108989 |
5.83 |