P/2007 Q2 (Gilmore)
| Parameter |
Value |
| Designation |
P/2007 Q2 (Gilmore) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-08-23T21:08:36.447360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:11Z |
| Obs used |
146 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-09-13.0000000 |
| e |
0.67122948 |
| q (au) |
1.839016 |
| a (au) |
5.593616 |
| i (deg) |
10.238439 |
| Ω (om, deg) |
172.248957 |
| ω (w, deg) |
163.150307 |
| M (ma, deg) |
1.498898 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.814 + 3.468\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.814 |
| n |
3.468 |
| gf |
0.979 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:43:22.55 |
+07:57:10.9 |
HIP 47722 |
5.25 |
| 2026-02-03 12:00 |
09:43:11.48 |
+07:58:11.2 |
HIP 47722 |
8.05 |
| 2026-02-04 00:00 |
09:43:00.39 |
+07:59:11.8 |
HIP 47722 |
10.92 |
| 2026-02-04 12:00 |
09:42:49.28 |
+08:00:12.7 |
HIP 47722 |
13.82 |
| 2026-02-05 00:00 |
09:42:38.15 |
+08:01:13.9 |
HIP 47722 |
16.74 |
| 2026-02-05 12:00 |
09:42:27.00 |
+08:02:15.3 |
HIP 47722 |
19.67 |
| 2026-02-06 00:00 |
09:42:15.83 |
+08:03:17.0 |
HIP 47722 |
22.60 |
| 2026-02-06 12:00 |
09:42:04.64 |
+08:04:18.9 |
HIP 47722 |
25.55 |
| 2026-02-07 00:00 |
09:41:53.44 |
+08:05:21.1 |
HIP 47446 |
27.90 |
| 2026-02-07 12:00 |
09:41:42.22 |
+08:06:23.5 |
HIP 47446 |
24.94 |
| 2026-02-08 00:00 |
09:41:30.99 |
+08:07:26.2 |
HIP 47446 |
21.98 |
| 2026-02-08 12:00 |
09:41:19.75 |
+08:08:29.1 |
HIP 47446 |
19.02 |
| 2026-02-09 00:00 |
09:41:08.50 |
+08:09:32.2 |
HIP 47446 |
16.05 |
| 2026-02-09 12:00 |
09:40:57.24 |
+08:10:35.5 |
HIP 47446 |
13.09 |
| 2026-02-10 00:00 |
09:40:45.97 |
+08:11:39.0 |
HIP 47446 |
10.14 |
| 2026-02-10 12:00 |
09:40:34.70 |
+08:12:42.7 |
HIP 47446 |
7.21 |
| 2026-02-11 00:00 |
09:40:23.42 |
+08:13:46.7 |
HIP 47446 |
4.34 |
| 2026-02-11 12:00 |
09:40:12.14 |
+08:14:50.8 |
HIP 47446 |
1.89 |
| 2026-02-12 00:00 |
09:40:00.86 |
+08:15:55.0 |
HIP 47446 |
2.48 |
| 2026-02-12 12:00 |
09:39:49.58 |
+08:16:59.5 |
HIP 47446 |
5.16 |
| 2026-02-13 00:00 |
09:39:38.30 |
+08:18:04.1 |
HIP 47446 |
8.06 |
| 2026-02-13 12:00 |
09:39:27.02 |
+08:19:08.8 |
HIP 47446 |
11.01 |
| 2026-02-14 00:00 |
09:39:15.75 |
+08:20:13.7 |
HIP 47446 |
13.98 |
| 2026-02-14 12:00 |
09:39:04.48 |
+08:21:18.8 |
HIP 47446 |
16.95 |
| 2026-02-15 00:00 |
09:38:53.22 |
+08:22:23.9 |
HIP 47446 |
19.93 |
| 2026-02-15 12:00 |
09:38:41.96 |
+08:23:29.2 |
HIP 47446 |
22.91 |
| 2026-02-16 00:00 |
09:38:30.72 |
+08:24:34.6 |
HIP 47446 |
25.89 |
| 2026-02-16 12:00 |
09:38:19.49 |
+08:25:40.1 |
HIP 47219 |
28.72 |
| 2026-02-17 00:00 |
09:38:08.27 |
+08:26:45.7 |
HIP 47219 |
26.53 |
| 2026-02-17 12:00 |
09:37:57.07 |
+08:27:51.4 |
HIP 47219 |
24.50 |
| 2026-02-18 00:00 |
09:37:45.88 |
+08:28:57.2 |
HIP 47219 |
22.69 |
| 2026-02-18 12:00 |
09:37:34.71 |
+08:30:03.1 |
HIP 47219 |
21.14 |
| 2026-02-19 00:00 |
09:37:23.55 |
+08:31:09.0 |
HIP 47219 |
19.91 |
| 2026-02-19 12:00 |
09:37:12.42 |
+08:32:15.0 |
HIP 47219 |
19.07 |
| 2026-02-20 00:00 |
09:37:01.31 |
+08:33:21.0 |
HIP 47136 |
17.87 |
| 2026-02-20 12:00 |
09:36:50.22 |
+08:34:27.1 |
HIP 47136 |
15.44 |
| 2026-02-21 00:00 |
09:36:39.16 |
+08:35:33.2 |
HIP 47136 |
13.23 |
| 2026-02-21 12:00 |
09:36:28.12 |
+08:36:39.3 |
HIP 47136 |
11.35 |
| 2026-02-22 00:00 |
09:36:17.11 |
+08:37:45.4 |
HIP 47136 |
10.01 |
| 2026-02-22 12:00 |
09:36:06.13 |
+08:38:51.6 |
HIP 47136 |
9.42 |
| 2026-02-23 00:00 |
09:35:55.18 |
+08:39:57.7 |
HIP 47136 |
9.71 |
| 2026-02-23 12:00 |
09:35:44.26 |
+08:41:03.9 |
HIP 47136 |
10.81 |
| 2026-02-24 00:00 |
09:35:33.37 |
+08:42:10.0 |
HIP 47136 |
12.50 |