| 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) |
| 2026-06-01 00:00 |
22:11:30.00 |
+48:58:08.3 |
HIP 109503 |
6.88 |
| 2026-06-01 12:00 |
22:11:29.29 |
+48:58:41.7 |
HIP 109503 |
6.43 |
| 2026-06-02 00:00 |
22:11:28.56 |
+48:59:14.9 |
HIP 109503 |
5.98 |
| 2026-06-02 12:00 |
22:11:27.79 |
+48:59:48.0 |
HIP 109503 |
5.56 |
| 2026-06-03 00:00 |
22:11:27.00 |
+49:00:21.0 |
HIP 109503 |
5.17 |
| 2026-06-03 12:00 |
22:11:26.17 |
+49:00:53.9 |
HIP 109503 |
4.80 |
| 2026-06-04 00:00 |
22:11:25.31 |
+49:01:26.7 |
HIP 109503 |
4.47 |
| 2026-06-04 12:00 |
22:11:24.42 |
+49:01:59.3 |
HIP 109503 |
4.18 |
| 2026-06-05 00:00 |
22:11:23.49 |
+49:02:31.9 |
HIP 109503 |
3.95 |
| 2026-06-05 12:00 |
22:11:22.54 |
+49:03:04.3 |
HIP 109503 |
3.79 |
| 2026-06-06 00:00 |
22:11:21.55 |
+49:03:36.6 |
HIP 109503 |
3.70 |
| 2026-06-06 12:00 |
22:11:20.54 |
+49:04:08.8 |
HIP 109503 |
3.68 |
| 2026-06-07 00:00 |
22:11:19.49 |
+49:04:40.9 |
HIP 109503 |
3.75 |
| 2026-06-07 12:00 |
22:11:18.41 |
+49:05:12.8 |
HIP 109503 |
3.89 |
| 2026-06-08 00:00 |
22:11:17.30 |
+49:05:44.6 |
HIP 109503 |
4.10 |
| 2026-06-08 12:00 |
22:11:16.16 |
+49:06:16.3 |
HIP 109503 |
4.37 |
| 2026-06-09 00:00 |
22:11:14.99 |
+49:06:47.9 |
HIP 109503 |
4.69 |
| 2026-06-09 12:00 |
22:11:13.78 |
+49:07:19.3 |
HIP 109503 |
5.04 |
| 2026-06-10 00:00 |
22:11:12.55 |
+49:07:50.5 |
HIP 109503 |
5.42 |
| 2026-06-10 12:00 |
22:11:11.28 |
+49:08:21.7 |
HIP 109503 |
5.83 |
| 2026-06-11 00:00 |
22:11:09.99 |
+49:08:52.7 |
HIP 109503 |
6.26 |
| 2026-06-11 12:00 |
22:11:08.66 |
+49:09:23.5 |
HIP 109503 |
6.70 |
| 2026-06-12 00:00 |
22:11:07.30 |
+49:09:54.2 |
HIP 109503 |
7.16 |
| 2026-06-12 12:00 |
22:11:05.92 |
+49:10:24.7 |
HIP 109503 |
7.62 |
| 2026-06-13 00:00 |
22:11:04.50 |
+49:10:55.1 |
HIP 109503 |
8.10 |
| 2026-06-13 12:00 |
22:11:03.05 |
+49:11:25.4 |
HIP 109503 |
8.58 |
| 2026-06-14 00:00 |
22:11:01.57 |
+49:11:55.4 |
HIP 109503 |
9.07 |
| 2026-06-14 12:00 |
22:11:00.06 |
+49:12:25.4 |
HIP 109503 |
9.56 |
| 2026-06-15 00:00 |
22:10:58.52 |
+49:12:55.1 |
HIP 109503 |
10.06 |
| 2026-06-15 12:00 |
22:10:56.94 |
+49:13:24.7 |
HIP 109503 |
10.56 |
| 2026-06-16 00:00 |
22:10:55.34 |
+49:13:54.1 |
HIP 109503 |
11.06 |
| 2026-06-16 12:00 |
22:10:53.71 |
+49:14:23.4 |
HIP 109503 |
11.57 |
| 2026-06-17 00:00 |
22:10:52.05 |
+49:14:52.5 |
HIP 109503 |
12.07 |
| 2026-06-17 12:00 |
22:10:50.36 |
+49:15:21.4 |
HIP 109503 |
12.58 |
| 2026-06-18 00:00 |
22:10:48.64 |
+49:15:50.1 |
HIP 109503 |
13.09 |
| 2026-06-18 12:00 |
22:10:46.89 |
+49:16:18.7 |
HIP 109503 |
13.61 |
| 2026-06-19 00:00 |
22:10:45.11 |
+49:16:47.0 |
HIP 109503 |
14.12 |
| 2026-06-19 12:00 |
22:10:43.30 |
+49:17:15.2 |
HIP 109503 |
14.63 |
| 2026-06-20 00:00 |
22:10:41.46 |
+49:17:43.3 |
HIP 109503 |
15.15 |
| 2026-06-20 12:00 |
22:10:39.59 |
+49:18:11.1 |
HIP 109503 |
15.66 |
| 2026-06-21 00:00 |
22:10:37.70 |
+49:18:38.7 |
HIP 109503 |
16.18 |
| 2026-06-21 12:00 |
22:10:35.77 |
+49:19:06.2 |
HIP 109503 |
16.70 |
| 2026-06-22 00:00 |
22:10:33.82 |
+49:19:33.4 |
HIP 109503 |
17.21 |