| Parameter |
Value |
| Designation |
P/2015 Q2 (Pimentel) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-10T08:08:29.523840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-11.0000000 |
| e |
0.75436589 |
| q (au) |
1.819120 |
| a (au) |
7.405813 |
| i (deg) |
146.202156 |
| Ω (om, deg) |
228.244773 |
| ω (w, deg) |
244.407920 |
| M (ma, deg) |
0.032314 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.546 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.546 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
11:39:24.19 |
+36:02:05.8 |
HIP 56799 |
27.91 |
| 2026-06-01 12:00 |
11:39:20.35 |
+36:01:15.6 |
HIP 56799 |
26.86 |
| 2026-06-02 00:00 |
11:39:16.60 |
+36:00:25.0 |
HIP 56799 |
25.82 |
| 2026-06-02 12:00 |
11:39:12.94 |
+35:59:33.9 |
HIP 56799 |
24.79 |
| 2026-06-03 00:00 |
11:39:09.37 |
+35:58:42.3 |
HIP 56799 |
23.77 |
| 2026-06-03 12:00 |
11:39:05.89 |
+35:57:50.3 |
HIP 56799 |
22.75 |
| 2026-06-04 00:00 |
11:39:02.50 |
+35:56:57.8 |
HIP 56799 |
21.74 |
| 2026-06-04 12:00 |
11:38:59.20 |
+35:56:04.9 |
HIP 56799 |
20.73 |
| 2026-06-05 00:00 |
11:38:55.99 |
+35:55:11.5 |
HIP 56799 |
19.73 |
| 2026-06-05 12:00 |
11:38:52.87 |
+35:54:17.8 |
HIP 56799 |
18.74 |
| 2026-06-06 00:00 |
11:38:49.84 |
+35:53:23.5 |
HIP 56799 |
17.76 |
| 2026-06-06 12:00 |
11:38:46.90 |
+35:52:28.9 |
HIP 56799 |
16.78 |
| 2026-06-07 00:00 |
11:38:44.06 |
+35:51:33.8 |
HIP 56799 |
15.81 |
| 2026-06-07 12:00 |
11:38:41.30 |
+35:50:38.4 |
HIP 56799 |
14.86 |
| 2026-06-08 00:00 |
11:38:38.63 |
+35:49:42.5 |
HIP 56799 |
13.91 |
| 2026-06-08 12:00 |
11:38:36.05 |
+35:48:46.2 |
HIP 56799 |
12.98 |
| 2026-06-09 00:00 |
11:38:33.56 |
+35:47:49.6 |
HIP 56799 |
12.07 |
| 2026-06-09 12:00 |
11:38:31.16 |
+35:46:52.5 |
HIP 56799 |
11.17 |
| 2026-06-10 00:00 |
11:38:28.85 |
+35:45:55.0 |
HIP 56799 |
10.30 |
| 2026-06-10 12:00 |
11:38:26.63 |
+35:44:57.2 |
HIP 56799 |
9.45 |
| 2026-06-11 00:00 |
11:38:24.50 |
+35:43:59.0 |
HIP 56799 |
8.64 |
| 2026-06-11 12:00 |
11:38:22.46 |
+35:43:00.4 |
HIP 56799 |
7.88 |
| 2026-06-12 00:00 |
11:38:20.51 |
+35:42:01.5 |
HIP 56799 |
7.19 |
| 2026-06-12 12:00 |
11:38:18.65 |
+35:41:02.2 |
HIP 56799 |
6.57 |
| 2026-06-13 00:00 |
11:38:16.87 |
+35:40:02.6 |
HIP 56799 |
6.06 |
| 2026-06-13 12:00 |
11:38:15.19 |
+35:39:02.6 |
HIP 56799 |
5.68 |
| 2026-06-14 00:00 |
11:38:13.59 |
+35:38:02.3 |
HIP 56799 |
5.47 |
| 2026-06-14 12:00 |
11:38:12.08 |
+35:37:01.6 |
HIP 56799 |
5.44 |
| 2026-06-15 00:00 |
11:38:10.67 |
+35:36:00.6 |
HIP 56799 |
5.59 |
| 2026-06-15 12:00 |
11:38:09.34 |
+35:34:59.3 |
HIP 56799 |
5.91 |
| 2026-06-16 00:00 |
11:38:08.09 |
+35:33:57.7 |
HIP 56799 |
6.38 |
| 2026-06-16 12:00 |
11:38:06.94 |
+35:32:55.8 |
HIP 56799 |
6.96 |
| 2026-06-17 00:00 |
11:38:05.87 |
+35:31:53.6 |
HIP 56799 |
7.64 |
| 2026-06-17 12:00 |
11:38:04.89 |
+35:30:51.0 |
HIP 56799 |
8.38 |
| 2026-06-18 00:00 |
11:38:04.00 |
+35:29:48.2 |
HIP 56799 |
9.17 |
| 2026-06-18 12:00 |
11:38:03.20 |
+35:28:45.1 |
HIP 56799 |
10.01 |
| 2026-06-19 00:00 |
11:38:02.48 |
+35:27:41.8 |
HIP 56799 |
10.88 |
| 2026-06-19 12:00 |
11:38:01.85 |
+35:26:38.1 |
HIP 56799 |
11.77 |
| 2026-06-20 00:00 |
11:38:01.30 |
+35:25:34.2 |
HIP 56799 |
12.68 |
| 2026-06-20 12:00 |
11:38:00.84 |
+35:24:30.0 |
HIP 56799 |
13.61 |
| 2026-06-21 00:00 |
11:38:00.47 |
+35:23:25.6 |
HIP 56799 |
14.55 |
| 2026-06-21 12:00 |
11:38:00.18 |
+35:22:21.0 |
HIP 56799 |
15.51 |
| 2026-06-22 00:00 |
11:37:59.97 |
+35:21:16.1 |
HIP 56799 |
16.48 |