| Parameter |
Value |
| Designation |
228P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-08-23T21:36:01.512000Z |
| Orbit solution date (soln_date, UTC) |
2026-09-04T08:42:17Z |
| Obs used |
438 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
14.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-05-01.0000000 |
| e |
0.17698340 |
| q (au) |
3.430458 |
| a (au) |
4.168151 |
| i (deg) |
7.915354 |
| Ω (om, deg) |
31.066000 |
| ω (w, deg) |
114.803320 |
| M (ma, deg) |
346.692117 |
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) |
| 2026-09-20 00:00 |
03:23:43.88 |
+20:29:48.0 |
HIP 15737 |
20.12 |
| 2026-09-20 12:00 |
03:23:40.47 |
+20:30:20.9 |
HIP 15737 |
19.18 |
| 2026-09-21 00:00 |
03:23:36.80 |
+20:30:53.0 |
HIP 15737 |
18.21 |
| 2026-09-21 12:00 |
03:23:32.88 |
+20:31:24.3 |
HIP 15737 |
17.21 |
| 2026-09-22 00:00 |
03:23:28.71 |
+20:31:54.8 |
HIP 15737 |
16.20 |
| 2026-09-22 12:00 |
03:23:24.29 |
+20:32:24.4 |
HIP 15737 |
15.17 |
| 2026-09-23 00:00 |
03:23:19.61 |
+20:32:53.2 |
HIP 15737 |
14.14 |
| 2026-09-23 12:00 |
03:23:14.68 |
+20:33:21.2 |
HIP 15737 |
13.12 |
| 2026-09-24 00:00 |
03:23:09.50 |
+20:33:48.4 |
HIP 15737 |
12.13 |
| 2026-09-24 12:00 |
03:23:04.07 |
+20:34:14.6 |
HIP 15737 |
11.18 |
| 2026-09-25 00:00 |
03:22:58.39 |
+20:34:40.1 |
HIP 15737 |
10.32 |
| 2026-09-25 12:00 |
03:22:52.45 |
+20:35:04.7 |
HIP 15737 |
9.60 |
| 2026-09-26 00:00 |
03:22:46.26 |
+20:35:28.5 |
HIP 15737 |
9.05 |
| 2026-09-26 12:00 |
03:22:39.83 |
+20:35:51.4 |
HIP 15737 |
8.76 |
| 2026-09-27 00:00 |
03:22:33.14 |
+20:36:13.4 |
HIP 15737 |
8.77 |
| 2026-09-27 12:00 |
03:22:26.20 |
+20:36:34.6 |
HIP 15737 |
9.12 |
| 2026-09-28 00:00 |
03:22:19.01 |
+20:36:54.9 |
HIP 15737 |
9.78 |
| 2026-09-28 12:00 |
03:22:11.58 |
+20:37:14.4 |
HIP 15737 |
10.73 |
| 2026-09-29 00:00 |
03:22:03.89 |
+20:37:33.0 |
HIP 15737 |
11.93 |
| 2026-09-29 12:00 |
03:21:55.96 |
+20:37:50.7 |
HIP 15737 |
13.33 |
| 2026-09-30 00:00 |
03:21:47.77 |
+20:38:07.5 |
HIP 15608 |
11.44 |
| 2026-09-30 12:00 |
03:21:39.34 |
+20:38:23.5 |
HIP 15608 |
9.46 |
| 2026-10-01 00:00 |
03:21:30.67 |
+20:38:38.6 |
HIP 15608 |
7.42 |
| 2026-10-01 12:00 |
03:21:21.74 |
+20:38:52.8 |
HIP 15608 |
5.33 |
| 2026-10-02 00:00 |
03:21:12.57 |
+20:39:06.1 |
HIP 15608 |
3.20 |
| 2026-10-02 12:00 |
03:21:03.16 |
+20:39:18.5 |
HIP 15608 |
1.10 |
| 2026-10-03 00:00 |
03:20:53.50 |
+20:39:30.0 |
HIP 15608 |
1.44 |
| 2026-10-03 12:00 |
03:20:43.59 |
+20:39:40.7 |
HIP 15608 |
3.69 |
| 2026-10-04 00:00 |
03:20:33.45 |
+20:39:50.4 |
HIP 15608 |
6.05 |
| 2026-10-04 12:00 |
03:20:23.06 |
+20:39:59.2 |
HIP 15608 |
8.48 |
| 2026-10-05 00:00 |
03:20:12.43 |
+20:40:07.2 |
HIP 15608 |
10.96 |
| 2026-10-05 12:00 |
03:20:01.56 |
+20:40:14.2 |
HIP 15608 |
13.50 |
| 2026-10-06 00:00 |
03:19:50.46 |
+20:40:20.3 |
HIP 15608 |
16.09 |
| 2026-10-06 12:00 |
03:19:39.11 |
+20:40:25.5 |
HIP 15608 |
18.74 |
| 2026-10-07 00:00 |
03:19:27.54 |
+20:40:29.9 |
HIP 15608 |
21.45 |
| 2026-10-07 12:00 |
03:19:15.72 |
+20:40:33.3 |
HIP 15608 |
24.21 |
| 2026-10-08 00:00 |
03:19:03.68 |
+20:40:35.8 |
HIP 15509 |
26.52 |
| 2026-10-08 12:00 |
03:18:51.40 |
+20:40:37.4 |
HIP 15509 |
27.90 |
| 2026-10-09 00:00 |
03:18:38.90 |
+20:40:38.0 |
HIP 15509 |
29.51 |
| 2026-10-09 12:00 |
03:18:26.17 |
+20:40:37.8 |
HIP 15509 |
31.34 |
| 2026-10-10 00:00 |
03:18:13.21 |
+20:40:36.7 |
HIP 15198 |
32.75 |
| 2026-10-10 12:00 |
03:18:00.03 |
+20:40:34.6 |
HIP 15198 |
29.68 |
| 2026-10-11 00:00 |
03:17:46.63 |
+20:40:31.7 |
HIP 15198 |
26.55 |