| 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) |
| 2026-06-01 00:00 |
11:59:59.12 |
+02:38:03.1 |
HIP 58472 |
17.16 |
| 2026-06-01 12:00 |
11:59:56.47 |
+02:37:34.2 |
HIP 58472 |
17.31 |
| 2026-06-02 00:00 |
11:59:53.98 |
+02:37:04.3 |
HIP 58472 |
17.52 |
| 2026-06-02 12:00 |
11:59:51.65 |
+02:36:33.4 |
HIP 58472 |
17.80 |
| 2026-06-03 00:00 |
11:59:49.48 |
+02:36:01.6 |
HIP 58472 |
18.13 |
| 2026-06-03 12:00 |
11:59:47.48 |
+02:35:28.9 |
HIP 58472 |
18.51 |
| 2026-06-04 00:00 |
11:59:45.65 |
+02:34:55.2 |
HIP 58472 |
18.94 |
| 2026-06-04 12:00 |
11:59:43.97 |
+02:34:20.5 |
HIP 58472 |
19.42 |
| 2026-06-05 00:00 |
11:59:42.46 |
+02:33:44.9 |
HIP 58472 |
19.92 |
| 2026-06-05 12:00 |
11:59:41.11 |
+02:33:08.3 |
HIP 58472 |
20.47 |
| 2026-06-06 00:00 |
11:59:39.93 |
+02:32:30.8 |
HIP 58472 |
21.04 |
| 2026-06-06 12:00 |
11:59:38.90 |
+02:31:52.4 |
HIP 58472 |
21.64 |
| 2026-06-07 00:00 |
11:59:38.04 |
+02:31:13.0 |
HIP 58472 |
22.27 |
| 2026-06-07 12:00 |
11:59:37.34 |
+02:30:32.7 |
HIP 58472 |
22.92 |
| 2026-06-08 00:00 |
11:59:36.79 |
+02:29:51.4 |
HIP 58472 |
23.59 |
| 2026-06-08 12:00 |
11:59:36.41 |
+02:29:09.3 |
HIP 58472 |
24.28 |
| 2026-06-09 00:00 |
11:59:36.19 |
+02:28:26.2 |
HIP 58472 |
24.99 |
| 2026-06-09 12:00 |
11:59:36.12 |
+02:27:42.2 |
HIP 58472 |
25.72 |
| 2026-06-10 00:00 |
11:59:36.22 |
+02:26:57.2 |
HIP 58472 |
26.47 |
| 2026-06-10 12:00 |
11:59:36.47 |
+02:26:11.4 |
HIP 58472 |
27.23 |
| 2026-06-11 00:00 |
11:59:36.89 |
+02:25:24.6 |
HIP 58472 |
28.02 |
| 2026-06-11 12:00 |
11:59:37.46 |
+02:24:36.9 |
HIP 58643 |
28.12 |
| 2026-06-12 00:00 |
11:59:38.18 |
+02:23:48.4 |
HIP 58643 |
27.87 |
| 2026-06-12 12:00 |
11:59:39.07 |
+02:22:58.9 |
HIP 58643 |
27.60 |
| 2026-06-13 00:00 |
11:59:40.11 |
+02:22:08.5 |
HIP 58643 |
27.31 |
| 2026-06-13 12:00 |
11:59:41.31 |
+02:21:17.2 |
HIP 58643 |
27.01 |
| 2026-06-14 00:00 |
11:59:42.66 |
+02:20:25.0 |
HIP 58643 |
26.71 |
| 2026-06-14 12:00 |
11:59:44.17 |
+02:19:32.0 |
HIP 58643 |
26.39 |
| 2026-06-15 00:00 |
11:59:45.83 |
+02:18:38.0 |
HIP 58643 |
26.07 |
| 2026-06-15 12:00 |
11:59:47.65 |
+02:17:43.2 |
HIP 58643 |
25.74 |
| 2026-06-16 00:00 |
11:59:49.62 |
+02:16:47.5 |
HIP 58643 |
25.42 |
| 2026-06-16 12:00 |
11:59:51.74 |
+02:15:50.9 |
HIP 58643 |
25.11 |
| 2026-06-17 00:00 |
11:59:54.02 |
+02:14:53.4 |
HIP 58643 |
24.80 |
| 2026-06-17 12:00 |
11:59:56.45 |
+02:13:55.1 |
HIP 58643 |
24.51 |
| 2026-06-18 00:00 |
11:59:59.03 |
+02:12:56.0 |
HIP 58643 |
24.25 |
| 2026-06-18 12:00 |
12:00:01.75 |
+02:11:55.9 |
HIP 58643 |
24.00 |
| 2026-06-19 00:00 |
12:00:04.63 |
+02:10:55.1 |
HIP 58466 |
23.61 |
| 2026-06-19 12:00 |
12:00:07.66 |
+02:09:53.3 |
HIP 58466 |
23.03 |
| 2026-06-20 00:00 |
12:00:10.83 |
+02:08:50.8 |
HIP 58466 |
22.52 |
| 2026-06-20 12:00 |
12:00:14.16 |
+02:07:47.4 |
HIP 58466 |
22.09 |
| 2026-06-21 00:00 |
12:00:17.63 |
+02:06:43.2 |
HIP 58466 |
21.74 |
| 2026-06-21 12:00 |
12:00:21.24 |
+02:05:38.2 |
HIP 58466 |
21.49 |
| 2026-06-22 00:00 |
12:00:25.00 |
+02:04:32.3 |
HIP 58466 |
21.34 |