| 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) |
| 2026-05-12 00:00 |
01:19:18.44 |
+03:01:42.0 |
HIP 6188 |
15.75 |
| 2026-05-12 12:00 |
01:19:25.98 |
+03:02:17.6 |
HIP 6188 |
15.10 |
| 2026-05-13 00:00 |
01:19:33.49 |
+03:02:52.9 |
HIP 6188 |
14.69 |
| 2026-05-13 12:00 |
01:19:40.97 |
+03:03:28.0 |
HIP 6188 |
14.53 |
| 2026-05-14 00:00 |
01:19:48.43 |
+03:04:02.8 |
HIP 6188 |
14.64 |
| 2026-05-14 12:00 |
01:19:55.86 |
+03:04:37.3 |
HIP 6188 |
15.01 |
| 2026-05-15 00:00 |
01:20:03.26 |
+03:05:11.6 |
HIP 6188 |
15.61 |
| 2026-05-15 12:00 |
01:20:10.64 |
+03:05:45.7 |
HIP 6188 |
16.41 |
| 2026-05-16 00:00 |
01:20:17.99 |
+03:06:19.4 |
HIP 6188 |
17.39 |
| 2026-05-16 12:00 |
01:20:25.31 |
+03:06:53.0 |
HIP 6188 |
18.51 |
| 2026-05-17 00:00 |
01:20:32.59 |
+03:07:26.2 |
HIP 6188 |
19.75 |
| 2026-05-17 12:00 |
01:20:39.85 |
+03:07:59.2 |
HIP 6188 |
21.09 |
| 2026-05-18 00:00 |
01:20:47.09 |
+03:08:31.9 |
HIP 6188 |
22.50 |
| 2026-05-18 12:00 |
01:20:54.29 |
+03:09:04.4 |
HIP 6188 |
23.97 |
| 2026-05-19 00:00 |
01:21:01.45 |
+03:09:36.5 |
HIP 6188 |
25.49 |
| 2026-05-19 12:00 |
01:21:08.59 |
+03:10:08.4 |
HIP 6188 |
27.04 |
| 2026-05-20 00:00 |
01:21:15.70 |
+03:10:40.1 |
HIP 6407 |
25.55 |
| 2026-05-20 12:00 |
01:21:22.77 |
+03:11:11.4 |
HIP 6407 |
24.08 |
| 2026-05-21 00:00 |
01:21:29.82 |
+03:11:42.5 |
HIP 6407 |
22.66 |
| 2026-05-21 12:00 |
01:21:36.83 |
+03:12:13.2 |
HIP 6407 |
21.32 |
| 2026-05-22 00:00 |
01:21:43.80 |
+03:12:43.7 |
HIP 6407 |
20.07 |
| 2026-05-22 12:00 |
01:21:50.75 |
+03:13:13.9 |
HIP 6407 |
18.91 |
| 2026-05-23 00:00 |
01:21:57.66 |
+03:13:43.8 |
HIP 6407 |
17.87 |
| 2026-05-23 12:00 |
01:22:04.53 |
+03:14:13.5 |
HIP 6407 |
16.96 |
| 2026-05-24 00:00 |
01:22:11.37 |
+03:14:42.8 |
HIP 6407 |
16.20 |
| 2026-05-24 12:00 |
01:22:18.18 |
+03:15:11.9 |
HIP 6407 |
15.61 |
| 2026-05-25 00:00 |
01:22:24.95 |
+03:15:40.6 |
HIP 6407 |
15.21 |
| 2026-05-25 12:00 |
01:22:31.69 |
+03:16:09.1 |
HIP 6407 |
15.01 |
| 2026-05-26 00:00 |
01:22:38.39 |
+03:16:37.2 |
HIP 6407 |
15.02 |
| 2026-05-26 12:00 |
01:22:45.05 |
+03:17:05.1 |
HIP 6516 |
14.18 |
| 2026-05-27 00:00 |
01:22:51.68 |
+03:17:32.6 |
HIP 6516 |
12.48 |
| 2026-05-27 12:00 |
01:22:58.27 |
+03:17:59.9 |
HIP 6516 |
10.80 |
| 2026-05-28 00:00 |
01:23:04.83 |
+03:18:26.8 |
HIP 6516 |
9.14 |
| 2026-05-28 12:00 |
01:23:11.34 |
+03:18:53.5 |
HIP 6516 |
7.50 |
| 2026-05-29 00:00 |
01:23:17.82 |
+03:19:19.8 |
HIP 6516 |
5.90 |
| 2026-05-29 12:00 |
01:23:24.27 |
+03:19:45.8 |
HIP 6516 |
4.37 |
| 2026-05-30 00:00 |
01:23:30.67 |
+03:20:11.5 |
HIP 6516 |
2.98 |
| 2026-05-30 12:00 |
01:23:37.03 |
+03:20:37.0 |
HIP 6516 |
2.05 |
| 2026-05-31 00:00 |
01:23:43.36 |
+03:21:02.0 |
HIP 6516 |
2.20 |
| 2026-05-31 12:00 |
01:23:49.64 |
+03:21:26.8 |
HIP 6516 |
3.28 |
| 2026-06-01 00:00 |
01:23:55.89 |
+03:21:51.3 |
HIP 6516 |
4.68 |
| 2026-06-01 12:00 |
01:24:02.10 |
+03:22:15.4 |
HIP 6516 |
6.17 |
| 2026-06-02 00:00 |
01:24:08.26 |
+03:22:39.3 |
HIP 6516 |
7.69 |