| 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) |
| 2026-03-26 00:00 |
22:08:36.02 |
+47:44:12.3 |
HIP 109304 |
11.85 |
| 2026-03-26 12:00 |
22:08:38.98 |
+47:44:38.4 |
HIP 109304 |
11.38 |
| 2026-03-27 00:00 |
22:08:41.92 |
+47:45:04.7 |
HIP 109304 |
10.94 |
| 2026-03-27 12:00 |
22:08:44.84 |
+47:45:31.2 |
HIP 109304 |
10.51 |
| 2026-03-28 00:00 |
22:08:47.74 |
+47:45:57.9 |
HIP 109304 |
10.10 |
| 2026-03-28 12:00 |
22:08:50.62 |
+47:46:24.8 |
HIP 109304 |
9.72 |
| 2026-03-29 00:00 |
22:08:53.48 |
+47:46:51.8 |
HIP 109304 |
9.36 |
| 2026-03-29 12:00 |
22:08:56.33 |
+47:47:19.1 |
HIP 109304 |
9.03 |
| 2026-03-30 00:00 |
22:08:59.15 |
+47:47:46.5 |
HIP 109304 |
8.74 |
| 2026-03-30 12:00 |
22:09:01.96 |
+47:48:14.2 |
HIP 109304 |
8.48 |
| 2026-03-31 00:00 |
22:09:04.74 |
+47:48:42.0 |
HIP 109304 |
8.27 |
| 2026-03-31 12:00 |
22:09:07.51 |
+47:49:09.9 |
HIP 109304 |
8.09 |
| 2026-04-01 00:00 |
22:09:10.26 |
+47:49:38.1 |
HIP 109304 |
7.97 |
| 2026-04-01 12:00 |
22:09:12.99 |
+47:50:06.4 |
HIP 109304 |
7.89 |
| 2026-04-02 00:00 |
22:09:15.69 |
+47:50:34.9 |
HIP 109304 |
7.86 |
| 2026-04-02 12:00 |
22:09:18.38 |
+47:51:03.6 |
HIP 109304 |
7.88 |
| 2026-04-03 00:00 |
22:09:21.05 |
+47:51:32.5 |
HIP 109304 |
7.95 |
| 2026-04-03 12:00 |
22:09:23.69 |
+47:52:01.5 |
HIP 109304 |
8.07 |
| 2026-04-04 00:00 |
22:09:26.32 |
+47:52:30.7 |
HIP 109304 |
8.24 |
| 2026-04-04 12:00 |
22:09:28.92 |
+47:53:00.1 |
HIP 109304 |
8.45 |
| 2026-04-05 00:00 |
22:09:31.50 |
+47:53:29.6 |
HIP 109304 |
8.70 |
| 2026-04-05 12:00 |
22:09:34.06 |
+47:53:59.3 |
HIP 109304 |
8.99 |
| 2026-04-06 00:00 |
22:09:36.60 |
+47:54:29.1 |
HIP 109304 |
9.31 |
| 2026-04-06 12:00 |
22:09:39.12 |
+47:54:59.1 |
HIP 109464 |
8.98 |
| 2026-04-07 00:00 |
22:09:41.61 |
+47:55:29.3 |
HIP 109464 |
8.58 |
| 2026-04-07 12:00 |
22:09:44.09 |
+47:55:59.6 |
HIP 109464 |
8.20 |
| 2026-04-08 00:00 |
22:09:46.54 |
+47:56:30.1 |
HIP 109464 |
7.87 |
| 2026-04-08 12:00 |
22:09:48.97 |
+47:57:00.7 |
HIP 109464 |
7.59 |
| 2026-04-09 00:00 |
22:09:51.37 |
+47:57:31.4 |
HIP 109464 |
7.36 |
| 2026-04-09 12:00 |
22:09:53.75 |
+47:58:02.3 |
HIP 109464 |
7.18 |
| 2026-04-10 00:00 |
22:09:56.11 |
+47:58:33.4 |
HIP 109464 |
7.07 |
| 2026-04-10 12:00 |
22:09:58.45 |
+47:59:04.6 |
HIP 109464 |
7.02 |
| 2026-04-11 00:00 |
22:10:00.76 |
+47:59:35.9 |
HIP 109464 |
7.03 |
| 2026-04-11 12:00 |
22:10:03.05 |
+48:00:07.4 |
HIP 109464 |
7.11 |
| 2026-04-12 00:00 |
22:10:05.32 |
+48:00:39.0 |
HIP 109464 |
7.25 |
| 2026-04-12 12:00 |
22:10:07.56 |
+48:01:10.8 |
HIP 109464 |
7.45 |
| 2026-04-13 00:00 |
22:10:09.78 |
+48:01:42.6 |
HIP 109464 |
7.70 |
| 2026-04-13 12:00 |
22:10:11.97 |
+48:02:14.6 |
HIP 109464 |
8.00 |
| 2026-04-14 00:00 |
22:10:14.14 |
+48:02:46.8 |
HIP 109464 |
8.34 |
| 2026-04-14 12:00 |
22:10:16.29 |
+48:03:19.0 |
HIP 109464 |
8.72 |
| 2026-04-15 00:00 |
22:10:18.40 |
+48:03:51.4 |
HIP 109464 |
9.14 |
| 2026-04-15 12:00 |
22:10:20.50 |
+48:04:23.9 |
HIP 109464 |
9.58 |
| 2026-04-16 00:00 |
22:10:22.57 |
+48:04:56.5 |
HIP 109464 |
10.05 |