| Parameter |
Value |
| Designation |
P/2014 A2 (Hill) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-10-28T08:06:33.264000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
123 |
| NEO |
- |
| M1 |
17.000 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-01-19.0000000 |
| e |
0.64983414 |
| q (au) |
2.074675 |
| a (au) |
5.924835 |
| i (deg) |
24.513480 |
| Ω (om, deg) |
106.672024 |
| ω (w, deg) |
356.226385 |
| M (ma, deg) |
5.649321 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.070 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.070 |
| n |
6.000 |
| gf |
0.989 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
3.155 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
00:02:41.06 |
-26:01:37.3 |
HIP 146 |
18.00 |
| 2026-07-29 12:00 |
00:02:37.20 |
-26:04:47.2 |
HIP 146 |
20.04 |
| 2026-07-30 00:00 |
00:02:33.13 |
-26:07:57.9 |
HIP 272 |
20.59 |
| 2026-07-30 12:00 |
00:02:28.86 |
-26:11:09.3 |
HIP 272 |
18.69 |
| 2026-07-31 00:00 |
00:02:24.38 |
-26:14:21.4 |
HIP 272 |
17.26 |
| 2026-07-31 12:00 |
00:02:19.70 |
-26:17:34.3 |
HIP 272 |
16.43 |
| 2026-08-01 00:00 |
00:02:14.81 |
-26:20:47.8 |
HIP 272 |
16.32 |
| 2026-08-01 12:00 |
00:02:09.71 |
-26:24:02.0 |
HIP 272 |
16.95 |
| 2026-08-02 00:00 |
00:02:04.41 |
-26:27:16.9 |
HIP 272 |
18.27 |
| 2026-08-02 12:00 |
00:01:58.90 |
-26:30:32.3 |
HIP 272 |
20.14 |
| 2026-08-03 00:00 |
00:01:53.19 |
-26:33:48.4 |
HIP 272 |
22.45 |
| 2026-08-03 12:00 |
00:01:47.26 |
-26:37:05.1 |
HIP 272 |
25.09 |
| 2026-08-04 00:00 |
00:01:41.14 |
-26:40:22.3 |
HIP 272 |
27.96 |
| 2026-08-04 12:00 |
00:01:34.80 |
-26:43:40.1 |
HIP 178 |
26.13 |
| 2026-08-05 00:00 |
00:01:28.26 |
-26:46:58.4 |
HIP 178 |
23.69 |
| 2026-08-05 12:00 |
00:01:21.51 |
-26:50:17.1 |
HIP 178 |
21.60 |
| 2026-08-06 00:00 |
00:01:14.56 |
-26:53:36.4 |
HIP 178 |
19.98 |
| 2026-08-06 12:00 |
00:01:07.40 |
-26:56:56.1 |
HIP 178 |
18.98 |
| 2026-08-07 00:00 |
00:01:00.04 |
-27:00:16.2 |
HIP 178 |
18.69 |
| 2026-08-07 12:00 |
00:00:52.47 |
-27:03:36.7 |
HIP 178 |
19.19 |
| 2026-08-08 00:00 |
00:00:44.69 |
-27:06:57.6 |
HIP 178 |
20.41 |
| 2026-08-08 12:00 |
00:00:36.71 |
-27:10:18.9 |
HIP 178 |
22.26 |
| 2026-08-09 00:00 |
00:00:28.52 |
-27:13:40.4 |
HIP 178 |
24.60 |
| 2026-08-09 12:00 |
00:00:20.13 |
-27:17:02.3 |
HIP 178 |
27.32 |
| 2026-08-10 00:00 |
00:00:11.54 |
-27:20:24.4 |
HIP 178 |
30.33 |
| 2026-08-10 12:00 |
00:00:02.75 |
-27:23:46.8 |
HIP 64 |
32.02 |
| 2026-08-11 00:00 |
23:59:53.75 |
-27:27:09.4 |
HIP 64 |
29.50 |
| 2026-08-11 12:00 |
23:59:44.55 |
-27:30:32.1 |
HIP 64 |
27.33 |
| 2026-08-12 00:00 |
23:59:35.15 |
-27:33:55.0 |
HIP 64 |
25.61 |
| 2026-08-12 12:00 |
23:59:25.55 |
-27:37:18.1 |
HIP 64 |
24.45 |
| 2026-08-13 00:00 |
23:59:15.76 |
-27:40:41.2 |
HIP 64 |
23.94 |
| 2026-08-13 12:00 |
23:59:05.76 |
-27:44:04.4 |
HIP 118155 |
21.21 |
| 2026-08-14 00:00 |
23:58:55.57 |
-27:47:27.6 |
HIP 118155 |
17.18 |
| 2026-08-14 12:00 |
23:58:45.18 |
-27:50:50.8 |
HIP 118155 |
13.16 |
| 2026-08-15 00:00 |
23:58:34.60 |
-27:54:14.0 |
HIP 118155 |
9.15 |
| 2026-08-15 12:00 |
23:58:23.82 |
-27:57:37.2 |
HIP 118155 |
5.29 |
| 2026-08-16 00:00 |
23:58:12.86 |
-28:01:00.2 |
HIP 118155 |
2.50 |
| 2026-08-16 12:00 |
23:58:01.70 |
-28:04:23.2 |
HIP 118155 |
4.38 |
| 2026-08-17 00:00 |
23:57:50.35 |
-28:07:46.0 |
HIP 118155 |
8.20 |
| 2026-08-17 12:00 |
23:57:38.82 |
-28:11:08.6 |
HIP 118155 |
12.29 |
| 2026-08-18 00:00 |
23:57:27.10 |
-28:14:31.0 |
HIP 118155 |
16.47 |
| 2026-08-18 12:00 |
23:57:15.19 |
-28:17:53.2 |
HIP 118155 |
20.69 |
| 2026-08-19 00:00 |
23:57:03.10 |
-28:21:15.1 |
HIP 118155 |
24.95 |