| Parameter |
Value |
| Designation |
C/2007 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-03-19T08:29:13.778880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:15Z |
| Obs used |
204 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-01-29.0000000 |
| e |
1.00073266 |
| q (au) |
3.340909 |
| a (au) |
-4559.959890 |
| i (deg) |
110.178645 |
| Ω (om, deg) |
133.091647 |
| ω (w, deg) |
357.132366 |
| M (ma, deg) |
-0.000161 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.434 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.434 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.683 |
| 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) |
| 2026-09-20 00:00 |
21:07:29.66 |
+21:43:59.0 |
HIP 104327 |
7.59 |
| 2026-09-20 12:00 |
21:07:27.18 |
+21:43:26.0 |
HIP 104327 |
8.29 |
| 2026-09-21 00:00 |
21:07:24.73 |
+21:42:52.9 |
HIP 104327 |
9.01 |
| 2026-09-21 12:00 |
21:07:22.29 |
+21:42:19.6 |
HIP 104327 |
9.73 |
| 2026-09-22 00:00 |
21:07:19.88 |
+21:41:46.2 |
HIP 104327 |
10.46 |
| 2026-09-22 12:00 |
21:07:17.48 |
+21:41:12.8 |
HIP 104327 |
11.20 |
| 2026-09-23 00:00 |
21:07:15.11 |
+21:40:39.2 |
HIP 104175 |
11.93 |
| 2026-09-23 12:00 |
21:07:12.76 |
+21:40:05.5 |
HIP 104175 |
11.28 |
| 2026-09-24 00:00 |
21:07:10.43 |
+21:39:31.7 |
HIP 104175 |
10.66 |
| 2026-09-24 12:00 |
21:07:08.13 |
+21:38:57.8 |
HIP 104175 |
10.07 |
| 2026-09-25 00:00 |
21:07:05.84 |
+21:38:23.8 |
HIP 104175 |
9.50 |
| 2026-09-25 12:00 |
21:07:03.58 |
+21:37:49.7 |
HIP 104175 |
8.98 |
| 2026-09-26 00:00 |
21:07:01.35 |
+21:37:15.5 |
HIP 104175 |
8.50 |
| 2026-09-26 12:00 |
21:06:59.13 |
+21:36:41.2 |
HIP 104175 |
8.07 |
| 2026-09-27 00:00 |
21:06:56.94 |
+21:36:06.8 |
HIP 104175 |
7.70 |
| 2026-09-27 12:00 |
21:06:54.77 |
+21:35:32.3 |
HIP 104175 |
7.39 |
| 2026-09-28 00:00 |
21:06:52.62 |
+21:34:57.8 |
HIP 104175 |
7.16 |
| 2026-09-28 12:00 |
21:06:50.50 |
+21:34:23.2 |
HIP 104175 |
7.01 |
| 2026-09-29 00:00 |
21:06:48.40 |
+21:33:48.4 |
HIP 104175 |
6.94 |
| 2026-09-29 12:00 |
21:06:46.32 |
+21:33:13.7 |
HIP 104175 |
6.97 |
| 2026-09-30 00:00 |
21:06:44.27 |
+21:32:38.8 |
HIP 104175 |
7.07 |
| 2026-09-30 12:00 |
21:06:42.24 |
+21:32:03.8 |
HIP 104175 |
7.26 |
| 2026-10-01 00:00 |
21:06:40.24 |
+21:31:28.8 |
HIP 104175 |
7.52 |
| 2026-10-01 12:00 |
21:06:38.26 |
+21:30:53.7 |
HIP 104175 |
7.85 |
| 2026-10-02 00:00 |
21:06:36.31 |
+21:30:18.6 |
HIP 104175 |
8.24 |
| 2026-10-02 12:00 |
21:06:34.38 |
+21:29:43.4 |
HIP 104175 |
8.67 |
| 2026-10-03 00:00 |
21:06:32.47 |
+21:29:08.1 |
HIP 104175 |
9.15 |
| 2026-10-03 12:00 |
21:06:30.59 |
+21:28:32.8 |
HIP 104175 |
9.66 |
| 2026-10-04 00:00 |
21:06:28.73 |
+21:27:57.4 |
HIP 104175 |
10.20 |
| 2026-10-04 12:00 |
21:06:26.90 |
+21:27:21.9 |
HIP 104175 |
10.76 |
| 2026-10-05 00:00 |
21:06:25.10 |
+21:26:46.4 |
HIP 104134 |
11.02 |
| 2026-10-05 12:00 |
21:06:23.32 |
+21:26:10.9 |
HIP 104134 |
10.30 |
| 2026-10-06 00:00 |
21:06:21.57 |
+21:25:35.3 |
HIP 104134 |
9.58 |
| 2026-10-06 12:00 |
21:06:19.84 |
+21:24:59.6 |
HIP 104134 |
8.87 |
| 2026-10-07 00:00 |
21:06:18.13 |
+21:24:23.9 |
HIP 104134 |
8.16 |
| 2026-10-07 12:00 |
21:06:16.46 |
+21:23:48.2 |
HIP 104134 |
7.45 |
| 2026-10-08 00:00 |
21:06:14.81 |
+21:23:12.4 |
HIP 104134 |
6.75 |
| 2026-10-08 12:00 |
21:06:13.19 |
+21:22:36.6 |
HIP 104134 |
6.06 |
| 2026-10-09 00:00 |
21:06:11.59 |
+21:22:00.8 |
HIP 104134 |
5.37 |
| 2026-10-09 12:00 |
21:06:10.02 |
+21:21:25.0 |
HIP 104134 |
4.70 |
| 2026-10-10 00:00 |
21:06:08.47 |
+21:20:49.1 |
HIP 104134 |
4.03 |
| 2026-10-10 12:00 |
21:06:06.96 |
+21:20:13.2 |
HIP 104134 |
3.38 |
| 2026-10-11 00:00 |
21:06:05.47 |
+21:19:37.2 |
HIP 104134 |
2.76 |