| 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) |
| 2026-03-26 00:00 |
21:29:37.42 |
+04:45:49.3 |
HIP 105996 |
24.11 |
| 2026-03-26 12:00 |
21:29:39.62 |
+04:46:12.2 |
HIP 105996 |
24.73 |
| 2026-03-27 00:00 |
21:29:41.80 |
+04:46:35.1 |
HIP 105996 |
25.35 |
| 2026-03-27 12:00 |
21:29:43.96 |
+04:46:57.9 |
HIP 105996 |
25.97 |
| 2026-03-28 00:00 |
21:29:46.10 |
+04:47:20.8 |
HIP 105996 |
26.59 |
| 2026-03-28 12:00 |
21:29:48.23 |
+04:47:43.8 |
HIP 105996 |
27.20 |
| 2026-03-29 00:00 |
21:29:50.33 |
+04:48:06.7 |
HIP 105996 |
27.82 |
| 2026-03-29 12:00 |
21:29:52.42 |
+04:48:29.6 |
HIP 105996 |
28.43 |
| 2026-03-30 00:00 |
21:29:54.49 |
+04:48:52.5 |
HIP 105996 |
29.03 |
| 2026-03-30 12:00 |
21:29:56.54 |
+04:49:15.4 |
HIP 105996 |
29.64 |
| 2026-03-31 00:00 |
21:29:58.57 |
+04:49:38.4 |
HIP 105996 |
30.24 |
| 2026-03-31 12:00 |
21:30:00.59 |
+04:50:01.3 |
HIP 105996 |
30.83 |
| 2026-04-01 00:00 |
21:30:02.58 |
+04:50:24.2 |
HIP 105996 |
31.43 |
| 2026-04-01 12:00 |
21:30:04.56 |
+04:50:47.1 |
HIP 106290 |
31.74 |
| 2026-04-02 00:00 |
21:30:06.51 |
+04:51:10.0 |
HIP 106290 |
31.12 |
| 2026-04-02 12:00 |
21:30:08.45 |
+04:51:33.0 |
HIP 106290 |
30.50 |
| 2026-04-03 00:00 |
21:30:10.37 |
+04:51:55.9 |
HIP 106290 |
29.89 |
| 2026-04-03 12:00 |
21:30:12.26 |
+04:52:18.8 |
HIP 106290 |
29.29 |
| 2026-04-04 00:00 |
21:30:14.14 |
+04:52:41.6 |
HIP 106290 |
28.68 |
| 2026-04-04 12:00 |
21:30:16.00 |
+04:53:04.5 |
HIP 106290 |
28.08 |
| 2026-04-05 00:00 |
21:30:17.83 |
+04:53:27.4 |
HIP 106290 |
27.49 |
| 2026-04-05 12:00 |
21:30:19.65 |
+04:53:50.2 |
HIP 106290 |
26.90 |
| 2026-04-06 00:00 |
21:30:21.45 |
+04:54:13.0 |
HIP 106290 |
26.31 |
| 2026-04-06 12:00 |
21:30:23.22 |
+04:54:35.9 |
HIP 106290 |
25.73 |
| 2026-04-07 00:00 |
21:30:24.98 |
+04:54:58.7 |
HIP 106290 |
25.15 |
| 2026-04-07 12:00 |
21:30:26.71 |
+04:55:21.4 |
HIP 106290 |
24.57 |
| 2026-04-08 00:00 |
21:30:28.43 |
+04:55:44.2 |
HIP 106290 |
24.00 |
| 2026-04-08 12:00 |
21:30:30.12 |
+04:56:06.9 |
HIP 106290 |
23.43 |
| 2026-04-09 00:00 |
21:30:31.79 |
+04:56:29.6 |
HIP 106290 |
22.87 |
| 2026-04-09 12:00 |
21:30:33.45 |
+04:56:52.3 |
HIP 106290 |
22.31 |
| 2026-04-10 00:00 |
21:30:35.08 |
+04:57:15.0 |
HIP 106290 |
21.76 |
| 2026-04-10 12:00 |
21:30:36.68 |
+04:57:37.6 |
HIP 106290 |
21.21 |
| 2026-04-11 00:00 |
21:30:38.27 |
+04:58:00.2 |
HIP 106290 |
20.66 |
| 2026-04-11 12:00 |
21:30:39.84 |
+04:58:22.8 |
HIP 106290 |
20.12 |
| 2026-04-12 00:00 |
21:30:41.38 |
+04:58:45.3 |
HIP 106290 |
19.59 |
| 2026-04-12 12:00 |
21:30:42.90 |
+04:59:07.8 |
HIP 106290 |
19.05 |
| 2026-04-13 00:00 |
21:30:44.40 |
+04:59:30.3 |
HIP 106290 |
18.53 |
| 2026-04-13 12:00 |
21:30:45.88 |
+04:59:52.7 |
HIP 106290 |
18.00 |
| 2026-04-14 00:00 |
21:30:47.33 |
+05:00:15.1 |
HIP 106290 |
17.48 |
| 2026-04-14 12:00 |
21:30:48.77 |
+05:00:37.5 |
HIP 106290 |
16.97 |
| 2026-04-15 00:00 |
21:30:50.18 |
+05:00:59.8 |
HIP 106290 |
16.46 |
| 2026-04-15 12:00 |
21:30:51.57 |
+05:01:22.1 |
HIP 106290 |
15.96 |
| 2026-04-16 00:00 |
21:30:52.93 |
+05:01:44.3 |
HIP 106290 |
15.46 |