| 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
$$
M_a = (8.002 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.002 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
03:08:20.03 |
+18:23:01.6 |
HIP 14586 |
24.68 |
| 2026-07-29 12:00 |
03:08:38.57 |
+18:24:47.3 |
HIP 14721 |
22.02 |
| 2026-07-30 00:00 |
03:08:56.98 |
+18:26:32.4 |
HIP 14721 |
18.22 |
| 2026-07-30 12:00 |
03:09:15.24 |
+18:28:17.0 |
HIP 14721 |
14.98 |
| 2026-07-31 00:00 |
03:09:33.36 |
+18:30:00.9 |
HIP 14721 |
12.68 |
| 2026-07-31 12:00 |
03:09:51.32 |
+18:31:44.3 |
HIP 14721 |
11.84 |
| 2026-08-01 00:00 |
03:10:09.15 |
+18:33:27.1 |
HIP 14721 |
12.71 |
| 2026-08-01 12:00 |
03:10:26.82 |
+18:35:09.2 |
HIP 14721 |
14.97 |
| 2026-08-02 00:00 |
03:10:44.34 |
+18:36:50.8 |
HIP 14721 |
18.07 |
| 2026-08-02 12:00 |
03:11:01.71 |
+18:38:31.8 |
HIP 14721 |
21.63 |
| 2026-08-03 00:00 |
03:11:18.92 |
+18:40:12.2 |
HIP 14929 |
24.00 |
| 2026-08-03 12:00 |
03:11:35.98 |
+18:41:52.1 |
HIP 14929 |
19.98 |
| 2026-08-04 00:00 |
03:11:52.89 |
+18:43:31.3 |
HIP 14929 |
16.16 |
| 2026-08-04 12:00 |
03:12:09.63 |
+18:45:09.9 |
HIP 14929 |
12.71 |
| 2026-08-05 00:00 |
03:12:26.22 |
+18:46:47.9 |
HIP 14929 |
9.95 |
| 2026-08-05 12:00 |
03:12:42.65 |
+18:48:25.3 |
HIP 14929 |
8.51 |
| 2026-08-06 00:00 |
03:12:58.92 |
+18:50:02.1 |
HIP 14929 |
9.01 |
| 2026-08-06 12:00 |
03:13:15.03 |
+18:51:38.2 |
HIP 14929 |
11.14 |
| 2026-08-07 00:00 |
03:13:30.97 |
+18:53:13.8 |
HIP 15048 |
7.66 |
| 2026-08-07 12:00 |
03:13:46.74 |
+18:54:48.8 |
HIP 15048 |
4.07 |
| 2026-08-08 00:00 |
03:14:02.35 |
+18:56:23.1 |
HIP 15048 |
2.68 |
| 2026-08-08 12:00 |
03:14:17.79 |
+18:57:56.8 |
HIP 15048 |
5.44 |
| 2026-08-09 00:00 |
03:14:33.06 |
+18:59:29.9 |
HIP 15048 |
9.09 |
| 2026-08-09 12:00 |
03:14:48.16 |
+19:01:02.4 |
HIP 15048 |
12.87 |
| 2026-08-10 00:00 |
03:15:03.08 |
+19:02:34.3 |
HIP 15048 |
16.65 |
| 2026-08-10 12:00 |
03:15:17.83 |
+19:04:05.5 |
HIP 15048 |
20.42 |
| 2026-08-11 00:00 |
03:15:32.41 |
+19:05:36.1 |
HIP 15227 |
18.39 |
| 2026-08-11 12:00 |
03:15:46.80 |
+19:07:06.1 |
HIP 15227 |
15.25 |
| 2026-08-12 00:00 |
03:16:01.02 |
+19:08:35.4 |
HIP 15227 |
12.46 |
| 2026-08-12 12:00 |
03:16:15.06 |
+19:10:04.1 |
HIP 15227 |
10.25 |
| 2026-08-13 00:00 |
03:16:28.92 |
+19:11:32.2 |
HIP 15227 |
9.02 |
| 2026-08-13 12:00 |
03:16:42.59 |
+19:12:59.6 |
HIP 15227 |
9.10 |
| 2026-08-14 00:00 |
03:16:56.09 |
+19:14:26.4 |
HIP 15227 |
10.44 |
| 2026-08-14 12:00 |
03:17:09.39 |
+19:15:52.6 |
HIP 15227 |
12.59 |
| 2026-08-15 00:00 |
03:17:22.51 |
+19:17:18.1 |
HIP 15227 |
15.18 |
| 2026-08-15 12:00 |
03:17:35.44 |
+19:18:43.0 |
HIP 15227 |
18.01 |
| 2026-08-16 00:00 |
03:17:48.19 |
+19:20:07.2 |
HIP 15227 |
20.95 |
| 2026-08-16 12:00 |
03:18:00.74 |
+19:21:30.8 |
HIP 15227 |
23.94 |
| 2026-08-17 00:00 |
03:18:13.10 |
+19:22:53.7 |
HIP 15227 |
26.95 |
| 2026-08-17 12:00 |
03:18:25.28 |
+19:24:16.0 |
HIP 15506 |
27.69 |
| 2026-08-18 00:00 |
03:18:37.25 |
+19:25:37.7 |
HIP 15506 |
26.83 |
| 2026-08-18 12:00 |
03:18:49.03 |
+19:26:58.7 |
HIP 15506 |
26.34 |
| 2026-08-19 00:00 |
03:19:00.62 |
+19:28:19.0 |
HIP 15550 |
24.40 |