| 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) |
| 2026-03-26 00:00 |
12:27:57.32 |
+01:20:00.5 |
HIP 60902 |
18.03 |
| 2026-03-26 12:00 |
12:27:38.87 |
+01:21:22.1 |
HIP 60747 |
15.98 |
| 2026-03-27 00:00 |
12:27:20.41 |
+01:22:43.5 |
HIP 60747 |
12.41 |
| 2026-03-27 12:00 |
12:27:01.96 |
+01:24:04.6 |
HIP 60747 |
9.96 |
| 2026-03-28 00:00 |
12:26:43.51 |
+01:25:25.4 |
HIP 60747 |
9.52 |
| 2026-03-28 12:00 |
12:26:25.06 |
+01:26:46.0 |
HIP 60747 |
11.32 |
| 2026-03-29 00:00 |
12:26:06.63 |
+01:28:06.3 |
HIP 60632 |
13.55 |
| 2026-03-29 12:00 |
12:25:48.21 |
+01:29:26.2 |
HIP 60632 |
12.77 |
| 2026-03-30 00:00 |
12:25:29.80 |
+01:30:45.9 |
HIP 60632 |
13.72 |
| 2026-03-30 12:00 |
12:25:11.40 |
+01:32:05.2 |
HIP 60544 |
11.86 |
| 2026-03-31 00:00 |
12:24:53.03 |
+01:33:24.1 |
HIP 60544 |
10.81 |
| 2026-03-31 12:00 |
12:24:34.68 |
+01:34:42.7 |
HIP 60544 |
11.78 |
| 2026-04-01 00:00 |
12:24:16.35 |
+01:36:00.9 |
HIP 60456 |
10.53 |
| 2026-04-01 12:00 |
12:23:58.04 |
+01:37:18.7 |
HIP 60456 |
7.69 |
| 2026-04-02 00:00 |
12:23:39.77 |
+01:38:36.1 |
HIP 60456 |
7.24 |
| 2026-04-02 12:00 |
12:23:21.53 |
+01:39:53.1 |
HIP 60456 |
9.52 |
| 2026-04-03 00:00 |
12:23:03.32 |
+01:41:09.7 |
HIP 60456 |
13.17 |
| 2026-04-03 12:00 |
12:22:45.15 |
+01:42:25.8 |
HIP 60456 |
17.33 |
| 2026-04-04 00:00 |
12:22:27.01 |
+01:43:41.5 |
HIP 60456 |
21.71 |
| 2026-04-04 12:00 |
12:22:08.92 |
+01:44:56.7 |
HIP 60456 |
26.19 |
| 2026-04-05 00:00 |
12:21:50.87 |
+01:46:11.4 |
HIP 60190 |
24.55 |
| 2026-04-05 12:00 |
12:21:32.87 |
+01:47:25.6 |
HIP 60190 |
22.13 |
| 2026-04-06 00:00 |
12:21:14.91 |
+01:48:39.3 |
HIP 60190 |
20.49 |
| 2026-04-06 12:00 |
12:20:57.00 |
+01:49:52.5 |
HIP 60190 |
19.84 |
| 2026-04-07 00:00 |
12:20:39.15 |
+01:51:05.2 |
HIP 60190 |
20.24 |
| 2026-04-07 12:00 |
12:20:21.35 |
+01:52:17.3 |
HIP 60190 |
21.63 |
| 2026-04-08 00:00 |
12:20:03.61 |
+01:53:28.8 |
HIP 60190 |
23.84 |
| 2026-04-08 12:00 |
12:19:45.93 |
+01:54:39.8 |
HIP 60190 |
26.64 |
| 2026-04-09 00:00 |
12:19:28.31 |
+01:55:50.2 |
HIP 60190 |
29.87 |
| 2026-04-09 12:00 |
12:19:10.76 |
+01:57:00.0 |
HIP 59970 |
28.98 |
| 2026-04-10 00:00 |
12:18:53.27 |
+01:58:09.2 |
HIP 59970 |
27.43 |
| 2026-04-10 12:00 |
12:18:35.86 |
+01:59:17.8 |
HIP 59970 |
26.56 |
| 2026-04-11 00:00 |
12:18:18.51 |
+02:00:25.7 |
HIP 59900 |
25.02 |
| 2026-04-11 12:00 |
12:18:01.24 |
+02:01:33.0 |
HIP 59900 |
23.08 |
| 2026-04-12 00:00 |
12:17:44.04 |
+02:02:39.7 |
HIP 59900 |
21.89 |
| 2026-04-12 12:00 |
12:17:26.92 |
+02:03:45.6 |
HIP 59900 |
21.56 |
| 2026-04-13 00:00 |
12:17:09.89 |
+02:04:50.9 |
HIP 59900 |
22.11 |
| 2026-04-13 12:00 |
12:16:52.93 |
+02:05:55.5 |
HIP 59900 |
23.46 |
| 2026-04-14 00:00 |
12:16:36.06 |
+02:06:59.4 |
HIP 59900 |
25.49 |
| 2026-04-14 12:00 |
12:16:19.28 |
+02:08:02.6 |
HIP 59900 |
28.03 |
| 2026-04-15 00:00 |
12:16:02.59 |
+02:09:05.1 |
HIP 59900 |
30.95 |
| 2026-04-15 12:00 |
12:15:45.98 |
+02:10:06.8 |
HIP 59646 |
28.06 |
| 2026-04-16 00:00 |
12:15:29.48 |
+02:11:07.8 |
HIP 59646 |
23.82 |