| Parameter |
Value |
| Designation |
429P/LINEAR-Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-11-02T20:41:05.654400Z |
| Orbit solution date (soln_date, UTC) |
2024-03-04T23:13:07Z |
| Obs used |
587 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
25.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-06-16.0000000 |
| e |
0.50669295 |
| q (au) |
1.722910 |
| a (au) |
3.492571 |
| i (deg) |
7.748307 |
| Ω (om, deg) |
325.147789 |
| ω (w, deg) |
72.067040 |
| M (ma, deg) |
89.112743 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.233 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.233 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
15:52:03.89 |
-29:42:40.2 |
HIP 77664 |
9.84 |
| 2026-05-12 12:00 |
15:51:42.44 |
-29:41:52.0 |
HIP 77664 |
5.11 |
| 2026-05-13 00:00 |
15:51:20.93 |
-29:41:02.8 |
HIP 77664 |
0.39 |
| 2026-05-13 12:00 |
15:50:59.35 |
-29:40:12.5 |
HIP 77664 |
4.40 |
| 2026-05-14 00:00 |
15:50:37.72 |
-29:39:21.3 |
HIP 77664 |
9.17 |
| 2026-05-14 12:00 |
15:50:16.03 |
-29:38:29.0 |
HIP 77664 |
13.97 |
| 2026-05-15 00:00 |
15:49:54.29 |
-29:37:35.8 |
HIP 77457 |
16.02 |
| 2026-05-15 12:00 |
15:49:32.51 |
-29:36:41.6 |
HIP 77457 |
11.67 |
| 2026-05-16 00:00 |
15:49:10.68 |
-29:35:46.4 |
HIP 77457 |
7.88 |
| 2026-05-16 12:00 |
15:48:48.81 |
-29:34:50.2 |
HIP 77457 |
5.88 |
| 2026-05-17 00:00 |
15:48:26.91 |
-29:33:53.1 |
HIP 77457 |
7.34 |
| 2026-05-17 12:00 |
15:48:04.98 |
-29:32:55.0 |
HIP 77457 |
10.98 |
| 2026-05-18 00:00 |
15:47:43.01 |
-29:31:56.0 |
HIP 77374 |
13.10 |
| 2026-05-18 12:00 |
15:47:21.03 |
-29:30:56.0 |
HIP 77374 |
12.85 |
| 2026-05-19 00:00 |
15:46:59.03 |
-29:29:55.2 |
HIP 77374 |
14.35 |
| 2026-05-19 12:00 |
15:46:37.01 |
-29:28:53.4 |
HIP 77374 |
17.17 |
| 2026-05-20 00:00 |
15:46:14.98 |
-29:27:50.7 |
HIP 77220 |
17.31 |
| 2026-05-20 12:00 |
15:45:52.94 |
-29:26:47.1 |
HIP 77220 |
16.00 |
| 2026-05-21 00:00 |
15:45:30.90 |
-29:25:42.6 |
HIP 77220 |
16.13 |
| 2026-05-21 12:00 |
15:45:08.86 |
-29:24:37.2 |
HIP 77220 |
17.68 |
| 2026-05-22 00:00 |
15:44:46.82 |
-29:23:31.0 |
HIP 77220 |
20.32 |
| 2026-05-22 12:00 |
15:44:24.79 |
-29:22:23.9 |
HIP 76986 |
18.27 |
| 2026-05-23 00:00 |
15:44:02.78 |
-29:21:16.0 |
HIP 76986 |
14.93 |
| 2026-05-23 12:00 |
15:43:40.78 |
-29:20:07.2 |
HIP 76986 |
12.68 |
| 2026-05-24 00:00 |
15:43:18.79 |
-29:18:57.7 |
HIP 76986 |
12.14 |
| 2026-05-24 12:00 |
15:42:56.83 |
-29:17:47.3 |
HIP 76986 |
13.52 |
| 2026-05-25 00:00 |
15:42:34.90 |
-29:16:36.1 |
HIP 76851 |
13.55 |
| 2026-05-25 12:00 |
15:42:13.00 |
-29:15:24.1 |
HIP 76851 |
9.08 |
| 2026-05-26 00:00 |
15:41:51.13 |
-29:14:11.4 |
HIP 76851 |
5.46 |
| 2026-05-26 12:00 |
15:41:29.30 |
-29:12:57.9 |
HIP 76851 |
5.07 |
| 2026-05-27 00:00 |
15:41:07.50 |
-29:11:43.7 |
HIP 76851 |
8.37 |
| 2026-05-27 12:00 |
15:40:45.76 |
-29:10:28.7 |
HIP 76728 |
9.04 |
| 2026-05-28 00:00 |
15:40:24.06 |
-29:09:13.0 |
HIP 76728 |
5.70 |
| 2026-05-28 12:00 |
15:40:02.41 |
-29:07:56.6 |
HIP 76728 |
5.60 |
| 2026-05-29 00:00 |
15:39:40.81 |
-29:06:39.5 |
HIP 76728 |
8.85 |
| 2026-05-29 12:00 |
15:39:19.28 |
-29:05:21.8 |
HIP 76728 |
13.15 |
| 2026-05-30 00:00 |
15:38:57.80 |
-29:04:03.3 |
HIP 76728 |
17.74 |
| 2026-05-30 12:00 |
15:38:36.39 |
-29:02:44.2 |
HIP 76496 |
22.23 |
| 2026-05-31 00:00 |
15:38:15.05 |
-29:01:24.5 |
HIP 76496 |
20.39 |
| 2026-05-31 12:00 |
15:37:53.78 |
-29:00:04.2 |
HIP 76448 |
18.50 |
| 2026-06-01 00:00 |
15:37:32.59 |
-28:58:43.2 |
HIP 76448 |
16.20 |
| 2026-06-01 12:00 |
15:37:11.47 |
-28:57:21.6 |
HIP 76448 |
15.16 |
| 2026-06-02 00:00 |
15:36:50.43 |
-28:55:59.5 |
HIP 76448 |
15.61 |