228P/LINEAR
| Parameter |
Value |
| Designation |
228P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-08-23T22:00:38.856960Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:51Z |
| Obs used |
436 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-04-14.0000000 |
| e |
0.17695985 |
| q (au) |
3.430453 |
| a (au) |
4.168026 |
| i (deg) |
7.915353 |
| Ω (om, deg) |
31.066132 |
| ω (w, deg) |
114.805864 |
| M (ma, deg) |
344.720485 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.998 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.998 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.718 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
00:33:12.71 |
+01:55:06.7 |
HIP 2680 |
12.64 |
| 2026-02-03 12:00 |
00:33:33.75 |
+01:57:52.6 |
HIP 2680 |
6.71 |
| 2026-02-04 00:00 |
00:33:54.90 |
+02:00:38.9 |
HIP 2680 |
0.74 |
| 2026-02-04 12:00 |
00:34:16.15 |
+02:03:25.9 |
HIP 2680 |
5.26 |
| 2026-02-05 00:00 |
00:34:37.51 |
+02:06:13.3 |
HIP 2680 |
11.28 |
| 2026-02-05 12:00 |
00:34:58.97 |
+02:09:01.3 |
HIP 2680 |
17.33 |
| 2026-02-06 00:00 |
00:35:20.53 |
+02:11:49.8 |
HIP 2703 |
21.15 |
| 2026-02-06 12:00 |
00:35:42.20 |
+02:14:38.8 |
HIP 2703 |
23.55 |
| 2026-02-07 00:00 |
00:36:03.97 |
+02:17:28.3 |
HIP 2703 |
27.15 |
| 2026-02-07 12:00 |
00:36:25.84 |
+02:20:18.3 |
HIP 2970 |
21.45 |
| 2026-02-08 00:00 |
00:36:47.81 |
+02:23:08.8 |
HIP 2970 |
15.71 |
| 2026-02-08 12:00 |
00:37:09.89 |
+02:25:59.8 |
HIP 2970 |
10.45 |
| 2026-02-09 00:00 |
00:37:32.06 |
+02:28:51.2 |
HIP 2970 |
6.96 |
| 2026-02-09 12:00 |
00:37:54.33 |
+02:31:43.2 |
HIP 2970 |
8.10 |
| 2026-02-10 00:00 |
00:38:16.69 |
+02:34:35.6 |
HIP 2988 |
11.93 |
| 2026-02-10 12:00 |
00:38:39.16 |
+02:37:28.5 |
HIP 2988 |
12.75 |
| 2026-02-11 00:00 |
00:39:01.72 |
+02:40:21.9 |
HIP 2988 |
16.22 |
| 2026-02-11 12:00 |
00:39:24.38 |
+02:43:15.7 |
HIP 2988 |
21.09 |
| 2026-02-12 00:00 |
00:39:47.13 |
+02:46:10.0 |
HIP 3086 |
23.45 |
| 2026-02-12 12:00 |
00:40:09.97 |
+02:49:04.7 |
HIP 3086 |
23.69 |
| 2026-02-13 00:00 |
00:40:32.91 |
+02:51:59.9 |
HIP 3086 |
25.61 |
| 2026-02-13 12:00 |
00:40:55.94 |
+02:54:55.5 |
HIP 3086 |
28.87 |
| 2026-02-14 00:00 |
00:41:19.06 |
+02:57:51.5 |
HIP 3086 |
33.11 |
| 2026-02-14 12:00 |
00:41:42.27 |
+03:00:48.0 |
HIP 3407 |
36.11 |
| 2026-02-15 00:00 |
00:42:05.58 |
+03:03:44.9 |
HIP 3407 |
34.70 |
| 2026-02-15 12:00 |
00:42:28.97 |
+03:06:42.1 |
HIP 3276 |
33.61 |
| 2026-02-16 00:00 |
00:42:52.45 |
+03:09:39.8 |
HIP 3518 |
30.75 |
| 2026-02-16 12:00 |
00:43:16.02 |
+03:12:38.0 |
HIP 3518 |
24.78 |
| 2026-02-17 00:00 |
00:43:39.67 |
+03:15:36.5 |
HIP 3518 |
19.20 |
| 2026-02-17 12:00 |
00:44:03.41 |
+03:18:35.3 |
HIP 3518 |
14.50 |
| 2026-02-18 00:00 |
00:44:27.24 |
+03:21:34.6 |
HIP 3518 |
11.81 |
| 2026-02-18 12:00 |
00:44:51.15 |
+03:24:34.3 |
HIP 3518 |
12.55 |
| 2026-02-19 00:00 |
00:45:15.14 |
+03:27:34.3 |
HIP 3518 |
16.29 |
| 2026-02-19 12:00 |
00:45:39.22 |
+03:30:34.7 |
HIP 3618 |
20.16 |
| 2026-02-20 00:00 |
00:46:03.38 |
+03:33:35.4 |
HIP 3618 |
14.67 |
| 2026-02-20 12:00 |
00:46:27.62 |
+03:36:36.5 |
HIP 3618 |
10.72 |
| 2026-02-21 00:00 |
00:46:51.94 |
+03:39:38.0 |
HIP 3618 |
10.30 |
| 2026-02-21 12:00 |
00:47:16.34 |
+03:42:39.8 |
HIP 3618 |
13.78 |
| 2026-02-22 00:00 |
00:47:40.82 |
+03:45:41.9 |
HIP 3618 |
19.15 |
| 2026-02-22 12:00 |
00:48:05.37 |
+03:48:44.3 |
HIP 3764 |
20.25 |
| 2026-02-23 00:00 |
00:48:30.00 |
+03:51:47.1 |
HIP 3764 |
16.95 |
| 2026-02-23 12:00 |
00:48:54.71 |
+03:54:50.2 |
HIP 3764 |
16.09 |
| 2026-02-24 00:00 |
00:49:19.49 |
+03:57:53.6 |
HIP 3764 |
18.03 |