| 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 |
0.801 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
12:10:54.79 |
+00:10:50.2 |
HIP 59429 |
7.70 |
| 2026-07-29 12:00 |
12:11:07.36 |
+00:08:55.9 |
HIP 59429 |
5.26 |
| 2026-07-30 00:00 |
12:11:20.02 |
+00:07:01.2 |
HIP 59429 |
4.80 |
| 2026-07-30 12:00 |
12:11:32.76 |
+00:05:05.9 |
HIP 59429 |
6.78 |
| 2026-07-31 00:00 |
12:11:45.59 |
+00:03:10.2 |
HIP 59429 |
9.85 |
| 2026-07-31 12:00 |
12:11:58.51 |
+00:01:14.0 |
HIP 59429 |
13.28 |
| 2026-08-01 00:00 |
12:12:11.52 |
-00:00:42.6 |
HIP 59429 |
16.88 |
| 2026-08-01 12:00 |
12:12:24.61 |
-00:02:39.7 |
HIP 59429 |
20.57 |
| 2026-08-02 00:00 |
12:12:37.79 |
-00:04:37.2 |
HIP 59429 |
24.32 |
| 2026-08-02 12:00 |
12:12:51.05 |
-00:06:35.2 |
HIP 59476 |
26.35 |
| 2026-08-03 00:00 |
12:13:04.40 |
-00:08:33.7 |
HIP 59476 |
26.68 |
| 2026-08-03 12:00 |
12:13:17.83 |
-00:10:32.6 |
HIP 59476 |
27.58 |
| 2026-08-04 00:00 |
12:13:31.34 |
-00:12:31.9 |
HIP 59641 |
26.37 |
| 2026-08-04 12:00 |
12:13:44.94 |
-00:14:31.7 |
HIP 59641 |
23.90 |
| 2026-08-05 00:00 |
12:13:58.61 |
-00:16:31.9 |
HIP 59641 |
21.86 |
| 2026-08-05 12:00 |
12:14:12.37 |
-00:18:32.5 |
HIP 59641 |
20.40 |
| 2026-08-06 00:00 |
12:14:26.21 |
-00:20:33.5 |
HIP 59641 |
19.65 |
| 2026-08-06 12:00 |
12:14:40.13 |
-00:22:35.0 |
HIP 59733 |
17.80 |
| 2026-08-07 00:00 |
12:14:54.12 |
-00:24:36.9 |
HIP 59733 |
15.12 |
| 2026-08-07 12:00 |
12:15:08.20 |
-00:26:39.2 |
HIP 59733 |
13.15 |
| 2026-08-08 00:00 |
12:15:22.35 |
-00:28:41.9 |
HIP 59733 |
12.27 |
| 2026-08-08 12:00 |
12:15:36.58 |
-00:30:45.0 |
HIP 59733 |
12.71 |
| 2026-08-09 00:00 |
12:15:50.89 |
-00:32:48.6 |
HIP 59733 |
14.38 |
| 2026-08-09 12:00 |
12:16:05.27 |
-00:34:52.5 |
HIP 59733 |
16.93 |
| 2026-08-10 00:00 |
12:16:19.73 |
-00:36:56.8 |
HIP 59733 |
20.04 |
| 2026-08-10 12:00 |
12:16:34.26 |
-00:39:01.5 |
HIP 59733 |
23.50 |
| 2026-08-11 00:00 |
12:16:48.87 |
-00:41:06.6 |
HIP 59733 |
27.18 |
| 2026-08-11 12:00 |
12:17:03.55 |
-00:43:12.1 |
HIP 60030 |
24.52 |
| 2026-08-12 00:00 |
12:17:18.30 |
-00:45:18.0 |
HIP 60030 |
20.59 |
| 2026-08-12 12:00 |
12:17:33.13 |
-00:47:24.2 |
HIP 60030 |
16.79 |
| 2026-08-13 00:00 |
12:17:48.02 |
-00:49:30.8 |
HIP 60030 |
13.27 |
| 2026-08-13 12:00 |
12:18:02.99 |
-00:51:37.8 |
HIP 60030 |
10.31 |
| 2026-08-14 00:00 |
12:18:18.02 |
-00:53:45.1 |
HIP 60030 |
8.58 |
| 2026-08-14 12:00 |
12:18:33.13 |
-00:55:52.8 |
HIP 60030 |
8.83 |
| 2026-08-15 00:00 |
12:18:48.30 |
-00:58:00.8 |
HIP 60030 |
10.97 |
| 2026-08-15 12:00 |
12:19:03.54 |
-01:00:09.2 |
HIP 60030 |
14.17 |
| 2026-08-16 00:00 |
12:19:18.85 |
-01:02:17.9 |
HIP 60030 |
17.89 |
| 2026-08-16 12:00 |
12:19:34.22 |
-01:04:26.9 |
HIP 60030 |
21.87 |
| 2026-08-17 00:00 |
12:19:49.66 |
-01:06:36.3 |
HIP 60030 |
26.00 |
| 2026-08-17 12:00 |
12:20:05.16 |
-01:08:46.0 |
HIP 60129 |
28.89 |
| 2026-08-18 00:00 |
12:20:20.72 |
-01:10:56.0 |
HIP 60129 |
31.62 |
| 2026-08-18 12:00 |
12:20:36.35 |
-01:13:06.4 |
HIP 60129 |
34.72 |
| 2026-08-19 00:00 |
12:20:52.04 |
-01:15:17.0 |
HIP 60129 |
38.11 |