| Parameter |
Value |
| Designation |
C/2005 YW (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-12-07T20:22:51.346560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
226 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
11.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-11-26.0000000 |
| e |
0.98953342 |
| q (au) |
1.993011 |
| a (au) |
190.416587 |
| i (deg) |
40.543605 |
| Ω (om, deg) |
302.214425 |
| ω (w, deg) |
234.634030 |
| M (ma, deg) |
359.995555 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.687 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.687 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
21:27:17.83 |
+05:34:47.5 |
HIP 105933 |
11.29 |
| 2026-07-29 12:00 |
21:27:14.99 |
+05:34:39.8 |
HIP 105933 |
11.17 |
| 2026-07-30 00:00 |
21:27:12.15 |
+05:34:32.0 |
HIP 105888 |
10.83 |
| 2026-07-30 12:00 |
21:27:09.30 |
+05:34:24.0 |
HIP 105888 |
10.26 |
| 2026-07-31 00:00 |
21:27:06.45 |
+05:34:15.8 |
HIP 105888 |
9.71 |
| 2026-07-31 12:00 |
21:27:03.59 |
+05:34:07.5 |
HIP 105888 |
9.18 |
| 2026-08-01 00:00 |
21:27:00.72 |
+05:33:59.0 |
HIP 105888 |
8.68 |
| 2026-08-01 12:00 |
21:26:57.85 |
+05:33:50.3 |
HIP 105888 |
8.21 |
| 2026-08-02 00:00 |
21:26:54.98 |
+05:33:41.5 |
HIP 105888 |
7.77 |
| 2026-08-02 12:00 |
21:26:52.10 |
+05:33:32.6 |
HIP 105888 |
7.38 |
| 2026-08-03 00:00 |
21:26:49.22 |
+05:33:23.4 |
HIP 105888 |
7.04 |
| 2026-08-03 12:00 |
21:26:46.33 |
+05:33:14.1 |
HIP 105888 |
6.76 |
| 2026-08-04 00:00 |
21:26:43.44 |
+05:33:04.7 |
HIP 105888 |
6.55 |
| 2026-08-04 12:00 |
21:26:40.55 |
+05:32:55.1 |
HIP 105888 |
6.41 |
| 2026-08-05 00:00 |
21:26:37.65 |
+05:32:45.3 |
HIP 105888 |
6.35 |
| 2026-08-05 12:00 |
21:26:34.75 |
+05:32:35.4 |
HIP 105888 |
6.38 |
| 2026-08-06 00:00 |
21:26:31.85 |
+05:32:25.3 |
HIP 105888 |
6.49 |
| 2026-08-06 12:00 |
21:26:28.94 |
+05:32:15.1 |
HIP 105888 |
6.68 |
| 2026-08-07 00:00 |
21:26:26.03 |
+05:32:04.7 |
HIP 105888 |
6.94 |
| 2026-08-07 12:00 |
21:26:23.12 |
+05:31:54.2 |
HIP 105888 |
7.27 |
| 2026-08-08 00:00 |
21:26:20.20 |
+05:31:43.5 |
HIP 105888 |
7.65 |
| 2026-08-08 12:00 |
21:26:17.29 |
+05:31:32.7 |
HIP 105888 |
8.09 |
| 2026-08-09 00:00 |
21:26:14.37 |
+05:31:21.7 |
HIP 105888 |
8.57 |
| 2026-08-09 12:00 |
21:26:11.45 |
+05:31:10.6 |
HIP 105888 |
9.08 |
| 2026-08-10 00:00 |
21:26:08.53 |
+05:30:59.3 |
HIP 105888 |
9.62 |
| 2026-08-10 12:00 |
21:26:05.61 |
+05:30:47.9 |
HIP 105888 |
10.19 |
| 2026-08-11 00:00 |
21:26:02.69 |
+05:30:36.3 |
HIP 105888 |
10.78 |
| 2026-08-11 12:00 |
21:25:59.77 |
+05:30:24.6 |
HIP 105888 |
11.39 |
| 2026-08-12 00:00 |
21:25:56.85 |
+05:30:12.7 |
HIP 105888 |
12.01 |
| 2026-08-12 12:00 |
21:25:53.93 |
+05:30:00.7 |
HIP 105888 |
12.65 |
| 2026-08-13 00:00 |
21:25:51.01 |
+05:29:48.5 |
HIP 105888 |
13.30 |
| 2026-08-13 12:00 |
21:25:48.09 |
+05:29:36.3 |
HIP 105888 |
13.96 |
| 2026-08-14 00:00 |
21:25:45.17 |
+05:29:23.8 |
HIP 105888 |
14.63 |
| 2026-08-14 12:00 |
21:25:42.25 |
+05:29:11.3 |
HIP 105888 |
15.30 |
| 2026-08-15 00:00 |
21:25:39.33 |
+05:28:58.5 |
HIP 105888 |
15.98 |
| 2026-08-15 12:00 |
21:25:36.41 |
+05:28:45.7 |
HIP 105888 |
16.67 |
| 2026-08-16 00:00 |
21:25:33.50 |
+05:28:32.7 |
HIP 105888 |
17.37 |
| 2026-08-16 12:00 |
21:25:30.59 |
+05:28:19.6 |
HIP 105888 |
18.06 |
| 2026-08-17 00:00 |
21:25:27.68 |
+05:28:06.4 |
HIP 105888 |
18.76 |
| 2026-08-17 12:00 |
21:25:24.77 |
+05:27:53.0 |
HIP 105888 |
19.47 |
| 2026-08-18 00:00 |
21:25:21.87 |
+05:27:39.5 |
HIP 105888 |
20.17 |
| 2026-08-18 12:00 |
21:25:18.97 |
+05:27:25.9 |
HIP 105888 |
20.88 |
| 2026-08-19 00:00 |
21:25:16.07 |
+05:27:12.1 |
HIP 105888 |
21.60 |