| Parameter |
Value |
| Designation |
439P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-01-23T23:09:05.474880Z |
| Orbit solution date (soln_date, UTC) |
2022-02-05T22:46:18Z |
| Obs used |
154 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
23.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-01-18.0000000 |
| e |
0.50983794 |
| q (au) |
1.646306 |
| a (au) |
3.358697 |
| i (deg) |
6.957515 |
| Ω (om, deg) |
59.100410 |
| ω (w, deg) |
337.647279 |
| M (ma, deg) |
57.489034 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.779 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.779 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.897 |
| k |
0.992 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
16:42:29.75 |
-25:47:16.4 |
HIP 81950 |
40.88 |
| 2026-09-20 12:00 |
16:42:49.32 |
-25:47:47.7 |
HIP 81950 |
37.90 |
| 2026-09-21 00:00 |
16:43:09.09 |
-25:48:19.2 |
HIP 82052 |
34.37 |
| 2026-09-21 12:00 |
16:43:29.08 |
-25:48:51.0 |
HIP 82052 |
30.08 |
| 2026-09-22 00:00 |
16:43:49.26 |
-25:49:23.1 |
HIP 82052 |
25.83 |
| 2026-09-22 12:00 |
16:44:09.65 |
-25:49:55.4 |
HIP 82052 |
21.68 |
| 2026-09-23 00:00 |
16:44:30.24 |
-25:50:27.9 |
HIP 82052 |
17.73 |
| 2026-09-23 12:00 |
16:44:51.04 |
-25:51:00.7 |
HIP 82052 |
14.18 |
| 2026-09-24 00:00 |
16:45:12.03 |
-25:51:33.8 |
HIP 82052 |
11.48 |
| 2026-09-24 12:00 |
16:45:33.23 |
-25:52:07.0 |
HIP 82052 |
10.39 |
| 2026-09-25 00:00 |
16:45:54.62 |
-25:52:40.5 |
HIP 82052 |
11.42 |
| 2026-09-25 12:00 |
16:46:16.21 |
-25:53:14.2 |
HIP 82052 |
14.17 |
| 2026-09-26 00:00 |
16:46:37.99 |
-25:53:48.1 |
HIP 82052 |
17.90 |
| 2026-09-26 12:00 |
16:46:59.97 |
-25:54:22.2 |
HIP 82211 |
19.55 |
| 2026-09-27 00:00 |
16:47:22.14 |
-25:54:56.4 |
HIP 82211 |
17.01 |
| 2026-09-27 12:00 |
16:47:44.51 |
-25:55:30.9 |
HIP 82211 |
15.70 |
| 2026-09-28 00:00 |
16:48:07.07 |
-25:56:05.6 |
HIP 82211 |
15.97 |
| 2026-09-28 12:00 |
16:48:29.82 |
-25:56:40.5 |
HIP 82211 |
17.79 |
| 2026-09-29 00:00 |
16:48:52.76 |
-25:57:15.5 |
HIP 82211 |
20.78 |
| 2026-09-29 12:00 |
16:49:15.89 |
-25:57:50.7 |
HIP 82425 |
20.83 |
| 2026-09-30 00:00 |
16:49:39.20 |
-25:58:26.0 |
HIP 82425 |
15.79 |
| 2026-09-30 12:00 |
16:50:02.71 |
-25:59:01.5 |
HIP 82425 |
10.93 |
| 2026-10-01 00:00 |
16:50:26.40 |
-25:59:37.2 |
HIP 82425 |
6.75 |
| 2026-10-01 12:00 |
16:50:50.28 |
-26:00:13.0 |
HIP 82425 |
5.42 |
| 2026-10-02 00:00 |
16:51:14.35 |
-26:00:49.0 |
HIP 82425 |
8.48 |
| 2026-10-02 12:00 |
16:51:38.59 |
-26:01:25.0 |
HIP 82425 |
13.21 |
| 2026-10-03 00:00 |
16:52:03.03 |
-26:02:01.2 |
HIP 82425 |
18.41 |
| 2026-10-03 12:00 |
16:52:27.64 |
-26:02:37.6 |
HIP 82425 |
23.79 |
| 2026-10-04 00:00 |
16:52:52.44 |
-26:03:14.0 |
HIP 82708 |
23.99 |
| 2026-10-04 12:00 |
16:53:17.42 |
-26:03:50.6 |
HIP 82705 |
19.74 |
| 2026-10-05 00:00 |
16:53:42.58 |
-26:04:27.2 |
HIP 82705 |
15.77 |
| 2026-10-05 12:00 |
16:54:07.92 |
-26:05:04.0 |
HIP 82705 |
13.11 |
| 2026-10-06 00:00 |
16:54:33.43 |
-26:05:40.8 |
HIP 82705 |
12.67 |
| 2026-10-06 12:00 |
16:54:59.13 |
-26:06:17.7 |
HIP 82705 |
14.70 |
| 2026-10-07 00:00 |
16:55:25.00 |
-26:06:54.7 |
HIP 82705 |
18.44 |
| 2026-10-07 12:00 |
16:55:51.05 |
-26:07:31.8 |
HIP 82756 |
22.02 |
| 2026-10-08 00:00 |
16:56:17.27 |
-26:08:08.9 |
HIP 82977 |
24.96 |
| 2026-10-08 12:00 |
16:56:43.67 |
-26:08:46.1 |
HIP 83055 |
21.53 |
| 2026-10-09 00:00 |
16:57:10.24 |
-26:09:23.4 |
HIP 83055 |
16.02 |
| 2026-10-09 12:00 |
16:57:36.98 |
-26:10:00.7 |
HIP 83055 |
11.02 |
| 2026-10-10 00:00 |
16:58:03.90 |
-26:10:38.0 |
HIP 83055 |
7.65 |
| 2026-10-10 12:00 |
16:58:30.98 |
-26:11:15.4 |
HIP 83055 |
8.36 |
| 2026-10-11 00:00 |
16:58:58.23 |
-26:11:52.8 |
HIP 83147 |
8.87 |