225P/LINEAR
| Parameter |
Value |
| Designation |
225P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-08-16T11:23:49.657920Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T09:12:25Z |
| Obs used |
519 |
| NEO |
- |
| M1 |
19.200 |
| K1 |
5.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-01-01.0000000 |
| e |
0.63742487 |
| q (au) |
1.323935 |
| a (au) |
3.651479 |
| i (deg) |
21.343082 |
| Ω (om, deg) |
14.181870 |
| ω (w, deg) |
3.875149 |
| M (ma, deg) |
174.099157 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.575 |
| k |
0.802 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
12:52:00.48 |
-00:34:42.1 |
HIP 62808 |
21.24 |
| 2026-02-03 12:00 |
12:51:53.64 |
-00:34:09.6 |
HIP 62687 |
21.16 |
| 2026-02-04 00:00 |
12:51:46.62 |
-00:33:36.0 |
HIP 62687 |
20.07 |
| 2026-02-04 12:00 |
12:51:39.42 |
-00:33:01.4 |
HIP 62687 |
19.08 |
| 2026-02-05 00:00 |
12:51:32.04 |
-00:32:25.9 |
HIP 62687 |
18.21 |
| 2026-02-05 12:00 |
12:51:24.48 |
-00:31:49.5 |
HIP 62687 |
17.50 |
| 2026-02-06 00:00 |
12:51:16.74 |
-00:31:12.0 |
HIP 62687 |
16.99 |
| 2026-02-06 12:00 |
12:51:08.82 |
-00:30:33.6 |
HIP 62687 |
16.71 |
| 2026-02-07 00:00 |
12:51:00.72 |
-00:29:54.3 |
HIP 62687 |
16.68 |
| 2026-02-07 12:00 |
12:50:52.45 |
-00:29:14.0 |
HIP 62687 |
16.94 |
| 2026-02-08 00:00 |
12:50:43.99 |
-00:28:32.8 |
HIP 62687 |
17.48 |
| 2026-02-08 12:00 |
12:50:35.36 |
-00:27:50.6 |
HIP 62687 |
18.30 |
| 2026-02-09 00:00 |
12:50:26.55 |
-00:27:07.5 |
HIP 62687 |
19.38 |
| 2026-02-09 12:00 |
12:50:17.57 |
-00:26:23.5 |
HIP 62687 |
20.69 |
| 2026-02-10 00:00 |
12:50:08.41 |
-00:25:38.6 |
HIP 62687 |
22.20 |
| 2026-02-10 12:00 |
12:49:59.08 |
-00:24:52.7 |
HIP 62687 |
23.90 |
| 2026-02-11 00:00 |
12:49:49.57 |
-00:24:06.0 |
HIP 62687 |
25.75 |
| 2026-02-11 12:00 |
12:49:39.89 |
-00:23:18.3 |
HIP 62468 |
23.43 |
| 2026-02-12 00:00 |
12:49:30.03 |
-00:22:29.8 |
HIP 62468 |
20.92 |
| 2026-02-12 12:00 |
12:49:20.01 |
-00:21:40.3 |
HIP 62468 |
18.39 |
| 2026-02-13 00:00 |
12:49:09.81 |
-00:20:50.0 |
HIP 62468 |
15.86 |
| 2026-02-13 12:00 |
12:48:59.44 |
-00:19:58.9 |
HIP 62468 |
13.35 |
| 2026-02-14 00:00 |
12:48:48.91 |
-00:19:06.8 |
HIP 62468 |
10.90 |
| 2026-02-14 12:00 |
12:48:38.20 |
-00:18:14.0 |
HIP 62468 |
8.61 |
| 2026-02-15 00:00 |
12:48:27.33 |
-00:17:20.2 |
HIP 62468 |
6.71 |
| 2026-02-15 12:00 |
12:48:16.29 |
-00:16:25.7 |
HIP 62468 |
5.69 |
| 2026-02-16 00:00 |
12:48:05.08 |
-00:15:30.3 |
HIP 62468 |
6.06 |
| 2026-02-16 12:00 |
12:47:53.72 |
-00:14:34.1 |
HIP 62468 |
7.68 |
| 2026-02-17 00:00 |
12:47:42.19 |
-00:13:37.0 |
HIP 62468 |
9.99 |
| 2026-02-17 12:00 |
12:47:30.49 |
-00:12:39.2 |
HIP 62468 |
12.65 |
| 2026-02-18 00:00 |
12:47:18.64 |
-00:11:40.6 |
HIP 62468 |
15.50 |
| 2026-02-18 12:00 |
12:47:06.63 |
-00:10:41.2 |
HIP 62468 |
18.48 |
| 2026-02-19 00:00 |
12:46:54.46 |
-00:09:41.1 |
HIP 62468 |
21.56 |
| 2026-02-19 12:00 |
12:46:42.13 |
-00:08:40.2 |
HIP 62468 |
24.70 |
| 2026-02-20 00:00 |
12:46:29.65 |
-00:07:38.5 |
HIP 62238 |
22.90 |
| 2026-02-20 12:00 |
12:46:17.01 |
-00:06:36.1 |
HIP 62238 |
19.89 |
| 2026-02-21 00:00 |
12:46:04.22 |
-00:05:33.0 |
HIP 62238 |
16.97 |
| 2026-02-21 12:00 |
12:45:51.29 |
-00:04:29.2 |
HIP 62238 |
14.21 |
| 2026-02-22 00:00 |
12:45:38.20 |
-00:03:24.7 |
HIP 62238 |
11.78 |
| 2026-02-22 12:00 |
12:45:24.96 |
-00:02:19.5 |
HIP 62238 |
9.94 |
| 2026-02-23 00:00 |
12:45:11.58 |
-00:01:13.6 |
HIP 62238 |
9.11 |
| 2026-02-23 12:00 |
12:44:58.06 |
-00:00:07.0 |
HIP 62238 |
9.61 |
| 2026-02-24 00:00 |
12:44:44.39 |
+00:01:00.2 |
HIP 62238 |
11.30 |