| 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) |
| 2026-03-26 00:00 |
17:30:38.01 |
-25:10:57.3 |
HIP 85521 |
33.36 |
| 2026-03-26 12:00 |
17:30:44.04 |
-25:11:33.0 |
HIP 85882 |
32.86 |
| 2026-03-27 00:00 |
17:30:49.84 |
-25:12:08.6 |
HIP 85882 |
31.76 |
| 2026-03-27 12:00 |
17:30:55.41 |
-25:12:44.1 |
HIP 85882 |
30.74 |
| 2026-03-28 00:00 |
17:31:00.75 |
-25:13:19.6 |
HIP 85882 |
29.80 |
| 2026-03-28 12:00 |
17:31:05.84 |
-25:13:55.1 |
HIP 85882 |
28.94 |
| 2026-03-29 00:00 |
17:31:10.70 |
-25:14:30.4 |
HIP 85882 |
28.17 |
| 2026-03-29 12:00 |
17:31:15.33 |
-25:15:05.8 |
HIP 85882 |
27.47 |
| 2026-03-30 00:00 |
17:31:19.71 |
-25:15:41.0 |
HIP 85882 |
26.86 |
| 2026-03-30 12:00 |
17:31:23.86 |
-25:16:16.2 |
HIP 85882 |
26.34 |
| 2026-03-31 00:00 |
17:31:27.76 |
-25:16:51.3 |
HIP 85882 |
25.89 |
| 2026-03-31 12:00 |
17:31:31.43 |
-25:17:26.4 |
HIP 85882 |
25.53 |
| 2026-04-01 00:00 |
17:31:34.85 |
-25:18:01.3 |
HIP 85882 |
25.24 |
| 2026-04-01 12:00 |
17:31:38.03 |
-25:18:36.3 |
HIP 85882 |
25.03 |
| 2026-04-02 00:00 |
17:31:40.96 |
-25:19:11.1 |
HIP 85882 |
24.90 |
| 2026-04-02 12:00 |
17:31:43.65 |
-25:19:45.9 |
HIP 85882 |
24.83 |
| 2026-04-03 00:00 |
17:31:46.09 |
-25:20:20.7 |
HIP 85882 |
24.83 |
| 2026-04-03 12:00 |
17:31:48.29 |
-25:20:55.3 |
HIP 85882 |
24.90 |
| 2026-04-04 00:00 |
17:31:50.24 |
-25:21:29.9 |
HIP 85882 |
25.02 |
| 2026-04-04 12:00 |
17:31:51.94 |
-25:22:04.4 |
HIP 85882 |
25.20 |
| 2026-04-05 00:00 |
17:31:53.39 |
-25:22:38.9 |
HIP 85882 |
25.44 |
| 2026-04-05 12:00 |
17:31:54.59 |
-25:23:13.3 |
HIP 85882 |
25.72 |
| 2026-04-06 00:00 |
17:31:55.54 |
-25:23:47.6 |
HIP 85882 |
26.04 |
| 2026-04-06 12:00 |
17:31:56.23 |
-25:24:21.8 |
HIP 85882 |
26.41 |
| 2026-04-07 00:00 |
17:31:56.68 |
-25:24:55.9 |
HIP 85882 |
26.82 |
| 2026-04-07 12:00 |
17:31:56.87 |
-25:25:30.0 |
HIP 85882 |
27.27 |
| 2026-04-08 00:00 |
17:31:56.80 |
-25:26:04.0 |
HIP 85882 |
27.75 |
| 2026-04-08 12:00 |
17:31:56.48 |
-25:26:37.9 |
HIP 85882 |
28.26 |
| 2026-04-09 00:00 |
17:31:55.90 |
-25:27:11.8 |
HIP 85882 |
28.81 |
| 2026-04-09 12:00 |
17:31:55.06 |
-25:27:45.5 |
HIP 85882 |
29.38 |
| 2026-04-10 00:00 |
17:31:53.97 |
-25:28:19.2 |
HIP 85882 |
29.99 |
| 2026-04-10 12:00 |
17:31:52.62 |
-25:28:52.8 |
HIP 85882 |
30.62 |
| 2026-04-11 00:00 |
17:31:51.01 |
-25:29:26.2 |
HIP 85882 |
31.29 |
| 2026-04-11 12:00 |
17:31:49.13 |
-25:29:59.6 |
HIP 85882 |
31.99 |
| 2026-04-12 00:00 |
17:31:47.00 |
-25:30:32.9 |
HIP 85882 |
32.71 |
| 2026-04-12 12:00 |
17:31:44.61 |
-25:31:06.1 |
HIP 85882 |
33.47 |
| 2026-04-13 00:00 |
17:31:41.95 |
-25:31:39.2 |
HIP 85882 |
34.26 |
| 2026-04-13 12:00 |
17:31:39.04 |
-25:32:12.2 |
HIP 85882 |
35.08 |
| 2026-04-14 00:00 |
17:31:35.86 |
-25:32:45.1 |
HIP 85882 |
35.93 |
| 2026-04-14 12:00 |
17:31:32.41 |
-25:33:17.9 |
HIP 85882 |
36.82 |
| 2026-04-15 00:00 |
17:31:28.70 |
-25:33:50.6 |
HIP 85882 |
37.74 |
| 2026-04-15 12:00 |
17:31:24.73 |
-25:34:23.1 |
HIP 85521 |
37.62 |
| 2026-04-16 00:00 |
17:31:20.50 |
-25:34:55.6 |
HIP 85521 |
36.73 |