| 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) |
| 2026-07-29 00:00 |
22:07:00.91 |
+49:42:20.4 |
HIP 109272 |
13.35 |
| 2026-07-29 12:00 |
22:06:57.30 |
+49:42:28.7 |
HIP 109272 |
13.83 |
| 2026-07-30 00:00 |
22:06:53.67 |
+49:42:36.8 |
HIP 109113 |
13.66 |
| 2026-07-30 12:00 |
22:06:50.03 |
+49:42:44.5 |
HIP 109113 |
13.24 |
| 2026-07-31 00:00 |
22:06:46.38 |
+49:42:51.9 |
HIP 109113 |
12.84 |
| 2026-07-31 12:00 |
22:06:42.72 |
+49:42:59.0 |
HIP 109113 |
12.46 |
| 2026-08-01 00:00 |
22:06:39.04 |
+49:43:05.9 |
HIP 109113 |
12.11 |
| 2026-08-01 12:00 |
22:06:35.35 |
+49:43:12.4 |
HIP 109113 |
11.78 |
| 2026-08-02 00:00 |
22:06:31.65 |
+49:43:18.6 |
HIP 109113 |
11.47 |
| 2026-08-02 12:00 |
22:06:27.93 |
+49:43:24.5 |
HIP 109113 |
11.19 |
| 2026-08-03 00:00 |
22:06:24.21 |
+49:43:30.2 |
HIP 109113 |
10.95 |
| 2026-08-03 12:00 |
22:06:20.47 |
+49:43:35.5 |
HIP 109113 |
10.74 |
| 2026-08-04 00:00 |
22:06:16.72 |
+49:43:40.5 |
HIP 109113 |
10.56 |
| 2026-08-04 12:00 |
22:06:12.97 |
+49:43:45.2 |
HIP 109113 |
10.42 |
| 2026-08-05 00:00 |
22:06:09.20 |
+49:43:49.6 |
HIP 109113 |
10.32 |
| 2026-08-05 12:00 |
22:06:05.42 |
+49:43:53.7 |
HIP 109113 |
10.26 |
| 2026-08-06 00:00 |
22:06:01.63 |
+49:43:57.5 |
HIP 109113 |
10.25 |
| 2026-08-06 12:00 |
22:05:57.83 |
+49:44:01.0 |
HIP 109113 |
10.27 |
| 2026-08-07 00:00 |
22:05:54.02 |
+49:44:04.2 |
HIP 109113 |
10.34 |
| 2026-08-07 12:00 |
22:05:50.20 |
+49:44:07.1 |
HIP 109113 |
10.45 |
| 2026-08-08 00:00 |
22:05:46.38 |
+49:44:09.6 |
HIP 109113 |
10.60 |
| 2026-08-08 12:00 |
22:05:42.54 |
+49:44:11.9 |
HIP 109113 |
10.79 |
| 2026-08-09 00:00 |
22:05:38.70 |
+49:44:13.8 |
HIP 109113 |
11.01 |
| 2026-08-09 12:00 |
22:05:34.85 |
+49:44:15.5 |
HIP 109113 |
11.27 |
| 2026-08-10 00:00 |
22:05:30.99 |
+49:44:16.8 |
HIP 109113 |
11.56 |
| 2026-08-10 12:00 |
22:05:27.12 |
+49:44:17.8 |
HIP 109113 |
11.89 |
| 2026-08-11 00:00 |
22:05:23.25 |
+49:44:18.5 |
HIP 109113 |
12.24 |
| 2026-08-11 12:00 |
22:05:19.37 |
+49:44:18.9 |
HIP 109113 |
12.61 |
| 2026-08-12 00:00 |
22:05:15.49 |
+49:44:19.0 |
HIP 109113 |
13.01 |
| 2026-08-12 12:00 |
22:05:11.59 |
+49:44:18.8 |
HIP 109113 |
13.44 |
| 2026-08-13 00:00 |
22:05:07.69 |
+49:44:18.2 |
HIP 108914 |
13.79 |
| 2026-08-13 12:00 |
22:05:03.79 |
+49:44:17.4 |
HIP 108914 |
13.17 |
| 2026-08-14 00:00 |
22:04:59.88 |
+49:44:16.2 |
HIP 108914 |
12.55 |
| 2026-08-14 12:00 |
22:04:55.97 |
+49:44:14.7 |
HIP 108914 |
11.93 |
| 2026-08-15 00:00 |
22:04:52.05 |
+49:44:12.9 |
HIP 108914 |
11.31 |
| 2026-08-15 12:00 |
22:04:48.13 |
+49:44:10.8 |
HIP 108914 |
10.70 |
| 2026-08-16 00:00 |
22:04:44.20 |
+49:44:08.4 |
HIP 108914 |
10.08 |
| 2026-08-16 12:00 |
22:04:40.27 |
+49:44:05.7 |
HIP 108914 |
9.47 |
| 2026-08-17 00:00 |
22:04:36.34 |
+49:44:02.7 |
HIP 108914 |
8.87 |
| 2026-08-17 12:00 |
22:04:32.40 |
+49:43:59.3 |
HIP 108914 |
8.27 |
| 2026-08-18 00:00 |
22:04:28.47 |
+49:43:55.7 |
HIP 108914 |
7.68 |
| 2026-08-18 12:00 |
22:04:24.52 |
+49:43:51.7 |
HIP 108914 |
7.10 |
| 2026-08-19 00:00 |
22:04:20.58 |
+49:43:47.5 |
HIP 108914 |
6.53 |