| 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) |
| 2026-06-01 00:00 |
17:07:50.79 |
-26:05:41.8 |
HIP 83740 |
28.21 |
| 2026-06-01 12:00 |
17:07:27.25 |
-26:05:42.0 |
HIP 83740 |
26.21 |
| 2026-06-02 00:00 |
17:07:03.62 |
-26:05:41.8 |
HIP 83740 |
25.19 |
| 2026-06-02 12:00 |
17:06:39.92 |
-26:05:41.0 |
HIP 83740 |
25.27 |
| 2026-06-03 00:00 |
17:06:16.15 |
-26:05:39.7 |
HIP 83740 |
26.46 |
| 2026-06-03 12:00 |
17:05:52.31 |
-26:05:37.8 |
HIP 83740 |
28.62 |
| 2026-06-04 00:00 |
17:05:28.41 |
-26:05:35.4 |
HIP 83566 |
28.71 |
| 2026-06-04 12:00 |
17:05:04.45 |
-26:05:32.5 |
HIP 83566 |
27.24 |
| 2026-06-05 00:00 |
17:04:40.44 |
-26:05:29.0 |
HIP 83508 |
25.23 |
| 2026-06-05 12:00 |
17:04:16.38 |
-26:05:25.0 |
HIP 83508 |
23.80 |
| 2026-06-06 00:00 |
17:03:52.27 |
-26:05:20.5 |
HIP 83508 |
23.54 |
| 2026-06-06 12:00 |
17:03:28.13 |
-26:05:15.4 |
HIP 83508 |
24.51 |
| 2026-06-07 00:00 |
17:03:03.94 |
-26:05:09.8 |
HIP 83508 |
26.57 |
| 2026-06-07 12:00 |
17:02:39.72 |
-26:05:03.7 |
HIP 83508 |
29.50 |
| 2026-06-08 00:00 |
17:02:15.48 |
-26:04:57.1 |
HIP 83508 |
33.07 |
| 2026-06-08 12:00 |
17:01:51.21 |
-26:04:50.0 |
HIP 83147 |
32.93 |
| 2026-06-09 00:00 |
17:01:26.92 |
-26:04:42.3 |
HIP 83147 |
27.92 |
| 2026-06-09 12:00 |
17:01:02.62 |
-26:04:34.2 |
HIP 83147 |
23.11 |
| 2026-06-10 00:00 |
17:00:38.30 |
-26:04:25.5 |
HIP 83147 |
18.66 |
| 2026-06-10 12:00 |
17:00:13.98 |
-26:04:16.3 |
HIP 83147 |
14.90 |
| 2026-06-11 00:00 |
16:59:49.66 |
-26:04:06.6 |
HIP 83147 |
12.48 |
| 2026-06-11 12:00 |
16:59:25.34 |
-26:03:56.4 |
HIP 83147 |
12.22 |
| 2026-06-12 00:00 |
16:59:01.03 |
-26:03:45.8 |
HIP 83055 |
9.96 |
| 2026-06-12 12:00 |
16:58:36.73 |
-26:03:34.6 |
HIP 83055 |
4.50 |
| 2026-06-13 00:00 |
16:58:12.45 |
-26:03:23.0 |
HIP 83055 |
0.96 |
| 2026-06-13 12:00 |
16:57:48.19 |
-26:03:10.9 |
HIP 83055 |
6.41 |
| 2026-06-14 00:00 |
16:57:23.96 |
-26:02:58.3 |
HIP 83055 |
11.86 |
| 2026-06-14 12:00 |
16:56:59.75 |
-26:02:45.3 |
HIP 82977 |
15.65 |
| 2026-06-15 00:00 |
16:56:35.59 |
-26:02:31.8 |
HIP 82977 |
17.99 |
| 2026-06-15 12:00 |
16:56:11.46 |
-26:02:17.9 |
HIP 82977 |
21.48 |
| 2026-06-16 00:00 |
16:55:47.38 |
-26:02:03.5 |
HIP 82708 |
23.04 |
| 2026-06-16 12:00 |
16:55:23.35 |
-26:01:48.7 |
HIP 82708 |
18.54 |
| 2026-06-17 00:00 |
16:54:59.37 |
-26:01:33.5 |
HIP 82708 |
14.66 |
| 2026-06-17 12:00 |
16:54:35.45 |
-26:01:17.9 |
HIP 82708 |
12.01 |
| 2026-06-18 00:00 |
16:54:11.60 |
-26:01:01.8 |
HIP 82708 |
11.46 |
| 2026-06-18 12:00 |
16:53:47.81 |
-26:00:45.3 |
HIP 82708 |
13.25 |
| 2026-06-19 00:00 |
16:53:24.10 |
-26:00:28.5 |
HIP 82708 |
16.64 |
| 2026-06-19 12:00 |
16:53:00.46 |
-26:00:11.2 |
HIP 82708 |
20.84 |
| 2026-06-20 00:00 |
16:52:36.91 |
-25:59:53.6 |
HIP 82538 |
24.31 |
| 2026-06-20 12:00 |
16:52:13.44 |
-25:59:35.6 |
HIP 82425 |
21.24 |
| 2026-06-21 00:00 |
16:51:50.06 |
-25:59:17.2 |
HIP 82425 |
16.35 |
| 2026-06-21 12:00 |
16:51:26.77 |
-25:58:58.5 |
HIP 82425 |
11.82 |
| 2026-06-22 00:00 |
16:51:03.58 |
-25:58:39.4 |
HIP 82425 |
8.20 |