P/2010 E2 (Jarnac)
| Parameter |
Value |
| Designation |
P/2010 E2 (Jarnac) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-04-07T22:14:05.470080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:41Z |
| Obs used |
344 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-02.0000000 |
| e |
0.72237010 |
| q (au) |
2.398733 |
| a (au) |
8.640039 |
| i (deg) |
15.437000 |
| Ω (om, deg) |
177.899371 |
| ω (w, deg) |
8.294555 |
| M (ma, deg) |
359.770001 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.468 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.468 |
| n |
6.000 |
| gf |
0.984 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.971 |
| 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 |
00:55:01.49 |
+00:38:31.5 |
HIP 4297 |
8.86 |
| 2026-02-03 12:00 |
00:55:06.21 |
+00:39:06.1 |
HIP 4297 |
8.37 |
| 2026-02-04 00:00 |
00:55:10.98 |
+00:39:41.0 |
HIP 4297 |
8.06 |
| 2026-02-04 12:00 |
00:55:15.81 |
+00:40:16.1 |
HIP 4297 |
7.97 |
| 2026-02-05 00:00 |
00:55:20.69 |
+00:40:51.6 |
HIP 4297 |
8.11 |
| 2026-02-05 12:00 |
00:55:25.62 |
+00:41:27.3 |
HIP 4297 |
8.47 |
| 2026-02-06 00:00 |
00:55:30.60 |
+00:42:03.3 |
HIP 4297 |
9.04 |
| 2026-02-06 12:00 |
00:55:35.64 |
+00:42:39.5 |
HIP 4297 |
9.77 |
| 2026-02-07 00:00 |
00:55:40.72 |
+00:43:16.0 |
HIP 4297 |
10.66 |
| 2026-02-07 12:00 |
00:55:45.86 |
+00:43:52.8 |
HIP 4297 |
11.65 |
| 2026-02-08 00:00 |
00:55:51.04 |
+00:44:29.8 |
HIP 4297 |
12.74 |
| 2026-02-08 12:00 |
00:55:56.28 |
+00:45:07.0 |
HIP 4297 |
13.90 |
| 2026-02-09 00:00 |
00:56:01.56 |
+00:45:44.6 |
HIP 4297 |
15.13 |
| 2026-02-09 12:00 |
00:56:06.90 |
+00:46:22.4 |
HIP 4297 |
16.40 |
| 2026-02-10 00:00 |
00:56:12.28 |
+00:47:00.4 |
HIP 4312 |
17.51 |
| 2026-02-10 12:00 |
00:56:17.71 |
+00:47:38.6 |
HIP 4312 |
18.39 |
| 2026-02-11 00:00 |
00:56:23.19 |
+00:48:17.2 |
HIP 4312 |
19.36 |
| 2026-02-11 12:00 |
00:56:28.72 |
+00:48:55.9 |
HIP 4312 |
20.41 |
| 2026-02-12 00:00 |
00:56:34.30 |
+00:49:34.9 |
HIP 4312 |
21.52 |
| 2026-02-12 12:00 |
00:56:39.92 |
+00:50:14.1 |
HIP 4312 |
22.69 |
| 2026-02-13 00:00 |
00:56:45.59 |
+00:50:53.5 |
HIP 4312 |
23.91 |
| 2026-02-13 12:00 |
00:56:51.31 |
+00:51:33.2 |
HIP 4453 |
24.48 |
| 2026-02-14 00:00 |
00:56:57.07 |
+00:52:13.1 |
HIP 4453 |
25.07 |
| 2026-02-14 12:00 |
00:57:02.88 |
+00:52:53.2 |
HIP 4453 |
25.74 |
| 2026-02-15 00:00 |
00:57:08.73 |
+00:53:33.6 |
HIP 4453 |
26.50 |
| 2026-02-15 12:00 |
00:57:14.63 |
+00:54:14.1 |
HIP 4453 |
27.34 |
| 2026-02-16 00:00 |
00:57:20.58 |
+00:54:54.9 |
HIP 4465 |
26.98 |
| 2026-02-16 12:00 |
00:57:26.57 |
+00:55:35.9 |
HIP 4465 |
26.43 |
| 2026-02-17 00:00 |
00:57:32.60 |
+00:56:17.1 |
HIP 4465 |
25.98 |
| 2026-02-17 12:00 |
00:57:38.68 |
+00:56:58.5 |
HIP 4465 |
25.62 |
| 2026-02-18 00:00 |
00:57:44.80 |
+00:57:40.1 |
HIP 4465 |
25.36 |
| 2026-02-18 12:00 |
00:57:50.96 |
+00:58:21.9 |
HIP 4465 |
25.22 |
| 2026-02-19 00:00 |
00:57:57.16 |
+00:59:03.8 |
HIP 4623 |
24.44 |
| 2026-02-19 12:00 |
00:58:03.41 |
+00:59:46.0 |
HIP 4623 |
23.46 |
| 2026-02-20 00:00 |
00:58:09.70 |
+01:00:28.4 |
HIP 4623 |
22.56 |
| 2026-02-20 12:00 |
00:58:16.03 |
+01:01:10.9 |
HIP 4623 |
21.75 |
| 2026-02-21 00:00 |
00:58:22.40 |
+01:01:53.6 |
HIP 4623 |
21.05 |
| 2026-02-21 12:00 |
00:58:28.81 |
+01:02:36.5 |
HIP 4623 |
20.47 |
| 2026-02-22 00:00 |
00:58:35.26 |
+01:03:19.6 |
HIP 4623 |
20.03 |
| 2026-02-22 12:00 |
00:58:41.75 |
+01:04:02.9 |
HIP 4623 |
19.73 |
| 2026-02-23 00:00 |
00:58:48.28 |
+01:04:46.3 |
HIP 4623 |
19.59 |
| 2026-02-23 12:00 |
00:58:54.84 |
+01:05:29.9 |
HIP 4623 |
19.60 |
| 2026-02-24 00:00 |
00:59:01.45 |
+01:06:13.6 |
HIP 4623 |
19.78 |