| Parameter |
Value |
| Designation |
209P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-04-30T20:16:24.784320Z |
| Orbit solution date (soln_date, UTC) |
2024-10-05T23:12:39Z |
| Obs used |
2879 |
| NEO |
Yes |
| M1 |
18.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-06-09.0000000 |
| e |
0.68144491 |
| q (au) |
0.939590 |
| a (au) |
2.949537 |
| i (deg) |
21.337815 |
| Ω (om, deg) |
62.868525 |
| ω (w, deg) |
152.634859 |
| M (ma, deg) |
225.583149 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.965 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.965 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.542 |
| k |
0.800 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:01:24.35 |
-00:02:53.1 |
HIP 9394 |
26.62 |
| 2026-05-12 12:00 |
02:01:47.57 |
-00:00:42.7 |
HIP 9589 |
22.63 |
| 2026-05-13 00:00 |
02:02:10.75 |
+00:01:27.0 |
HIP 9589 |
16.45 |
| 2026-05-13 12:00 |
02:02:33.89 |
+00:03:35.9 |
HIP 9589 |
10.28 |
| 2026-05-14 00:00 |
02:02:57.00 |
+00:05:44.1 |
HIP 9589 |
4.15 |
| 2026-05-14 12:00 |
02:03:20.06 |
+00:07:51.5 |
HIP 9589 |
2.12 |
| 2026-05-15 00:00 |
02:03:43.08 |
+00:09:58.2 |
HIP 9589 |
8.19 |
| 2026-05-15 12:00 |
02:04:06.07 |
+00:12:04.1 |
HIP 9589 |
14.30 |
| 2026-05-16 00:00 |
02:04:29.01 |
+00:14:09.2 |
HIP 9742 |
13.58 |
| 2026-05-16 12:00 |
02:04:51.90 |
+00:16:13.6 |
HIP 9742 |
7.50 |
| 2026-05-17 00:00 |
02:05:14.76 |
+00:18:17.2 |
HIP 9742 |
1.54 |
| 2026-05-17 12:00 |
02:05:37.57 |
+00:20:20.1 |
HIP 9742 |
4.71 |
| 2026-05-18 00:00 |
02:06:00.33 |
+00:22:22.1 |
HIP 9742 |
10.73 |
| 2026-05-18 12:00 |
02:06:23.05 |
+00:24:23.4 |
HIP 9742 |
16.75 |
| 2026-05-19 00:00 |
02:06:45.72 |
+00:26:23.9 |
HIP 9742 |
22.76 |
| 2026-05-19 12:00 |
02:07:08.34 |
+00:28:23.6 |
HIP 9827 |
28.03 |
| 2026-05-20 00:00 |
02:07:30.92 |
+00:30:22.6 |
HIP 9994 |
30.94 |
| 2026-05-20 12:00 |
02:07:53.45 |
+00:32:20.7 |
HIP 9994 |
26.34 |
| 2026-05-21 00:00 |
02:08:15.92 |
+00:34:18.1 |
HIP 9994 |
22.40 |
| 2026-05-21 12:00 |
02:08:38.35 |
+00:36:14.6 |
HIP 9994 |
19.53 |
| 2026-05-22 00:00 |
02:09:00.72 |
+00:38:10.4 |
HIP 9994 |
18.21 |
| 2026-05-22 12:00 |
02:09:23.05 |
+00:40:05.4 |
HIP 10122 |
16.20 |
| 2026-05-23 00:00 |
02:09:45.32 |
+00:41:59.6 |
HIP 10122 |
14.10 |
| 2026-05-23 12:00 |
02:10:07.54 |
+00:43:53.0 |
HIP 10122 |
14.28 |
| 2026-05-24 00:00 |
02:10:29.70 |
+00:45:45.5 |
HIP 10122 |
16.65 |
| 2026-05-24 12:00 |
02:10:51.81 |
+00:47:37.3 |
HIP 10122 |
20.45 |
| 2026-05-25 00:00 |
02:11:13.86 |
+00:49:28.3 |
HIP 10122 |
25.03 |
| 2026-05-25 12:00 |
02:11:35.86 |
+00:51:18.5 |
HIP 10122 |
30.02 |
| 2026-05-26 00:00 |
02:11:57.81 |
+00:53:07.8 |
HIP 10122 |
35.24 |
| 2026-05-26 12:00 |
02:12:19.69 |
+00:54:56.4 |
HIP 10122 |
40.59 |
| 2026-05-27 00:00 |
02:12:41.52 |
+00:56:44.1 |
HIP 10482 |
39.41 |
| 2026-05-27 12:00 |
02:13:03.29 |
+00:58:31.0 |
HIP 10482 |
35.09 |
| 2026-05-28 00:00 |
02:13:25.00 |
+01:00:17.2 |
HIP 10482 |
31.23 |
| 2026-05-28 12:00 |
02:13:46.66 |
+01:02:02.5 |
HIP 10482 |
28.01 |
| 2026-05-29 00:00 |
02:14:08.25 |
+01:03:46.9 |
HIP 10482 |
25.66 |
| 2026-05-29 12:00 |
02:14:29.78 |
+01:05:30.6 |
HIP 10482 |
24.42 |
| 2026-05-30 00:00 |
02:14:51.25 |
+01:07:13.4 |
HIP 10482 |
24.45 |
| 2026-05-30 12:00 |
02:15:12.66 |
+01:08:55.4 |
HIP 10482 |
25.72 |
| 2026-05-31 00:00 |
02:15:34.01 |
+01:10:36.6 |
HIP 10593 |
24.07 |
| 2026-05-31 12:00 |
02:15:55.29 |
+01:12:17.0 |
HIP 10593 |
23.41 |
| 2026-06-01 00:00 |
02:16:16.51 |
+01:13:56.5 |
HIP 10697 |
21.55 |
| 2026-06-01 12:00 |
02:16:37.67 |
+01:15:35.2 |
HIP 10697 |
16.14 |
| 2026-06-02 00:00 |
02:16:58.76 |
+01:17:13.0 |
HIP 10697 |
10.87 |