C/2007 Y1 (LINEAR)
| 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 |
0.999 |
| 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) |
| 2026-02-03 00:00 |
21:11:49.47 |
+20:43:49.2 |
HIP 104514 |
22.26 |
| 2026-02-03 12:00 |
21:11:52.84 |
+20:43:56.5 |
HIP 104514 |
23.05 |
| 2026-02-04 00:00 |
21:11:56.21 |
+20:44:04.1 |
HIP 104514 |
23.83 |
| 2026-02-04 12:00 |
21:11:59.58 |
+20:44:12.0 |
HIP 104731 |
23.80 |
| 2026-02-05 00:00 |
21:12:02.95 |
+20:44:20.1 |
HIP 104731 |
23.26 |
| 2026-02-05 12:00 |
21:12:06.32 |
+20:44:28.4 |
HIP 104731 |
22.74 |
| 2026-02-06 00:00 |
21:12:09.69 |
+20:44:37.1 |
HIP 104731 |
22.23 |
| 2026-02-06 12:00 |
21:12:13.05 |
+20:44:45.9 |
HIP 104731 |
21.73 |
| 2026-02-07 00:00 |
21:12:16.42 |
+20:44:55.0 |
HIP 104731 |
21.24 |
| 2026-02-07 12:00 |
21:12:19.78 |
+20:45:04.4 |
HIP 104731 |
20.78 |
| 2026-02-08 00:00 |
21:12:23.15 |
+20:45:14.0 |
HIP 104731 |
20.33 |
| 2026-02-08 12:00 |
21:12:26.51 |
+20:45:23.9 |
HIP 104731 |
19.89 |
| 2026-02-09 00:00 |
21:12:29.86 |
+20:45:34.0 |
HIP 104731 |
19.48 |
| 2026-02-09 12:00 |
21:12:33.22 |
+20:45:44.4 |
HIP 104731 |
19.09 |
| 2026-02-10 00:00 |
21:12:36.57 |
+20:45:55.0 |
HIP 104731 |
18.72 |
| 2026-02-10 12:00 |
21:12:39.92 |
+20:46:05.8 |
HIP 104731 |
18.37 |
| 2026-02-11 00:00 |
21:12:43.27 |
+20:46:16.9 |
HIP 104731 |
18.05 |
| 2026-02-11 12:00 |
21:12:46.61 |
+20:46:28.2 |
HIP 104731 |
17.76 |
| 2026-02-12 00:00 |
21:12:49.95 |
+20:46:39.8 |
HIP 104731 |
17.49 |
| 2026-02-12 12:00 |
21:12:53.29 |
+20:46:51.6 |
HIP 104731 |
17.26 |
| 2026-02-13 00:00 |
21:12:56.62 |
+20:47:03.7 |
HIP 104731 |
17.05 |
| 2026-02-13 12:00 |
21:12:59.94 |
+20:47:16.0 |
HIP 104731 |
16.88 |
| 2026-02-14 00:00 |
21:13:03.27 |
+20:47:28.5 |
HIP 104731 |
16.74 |
| 2026-02-14 12:00 |
21:13:06.58 |
+20:47:41.3 |
HIP 104731 |
16.63 |
| 2026-02-15 00:00 |
21:13:09.90 |
+20:47:54.3 |
HIP 104731 |
16.56 |
| 2026-02-15 12:00 |
21:13:13.20 |
+20:48:07.5 |
HIP 104731 |
16.52 |
| 2026-02-16 00:00 |
21:13:16.50 |
+20:48:21.0 |
HIP 104731 |
16.51 |
| 2026-02-16 12:00 |
21:13:19.80 |
+20:48:34.7 |
HIP 104731 |
16.54 |
| 2026-02-17 00:00 |
21:13:23.09 |
+20:48:48.6 |
HIP 104731 |
16.61 |
| 2026-02-17 12:00 |
21:13:26.37 |
+20:49:02.7 |
HIP 104731 |
16.71 |
| 2026-02-18 00:00 |
21:13:29.65 |
+20:49:17.1 |
HIP 104731 |
16.84 |
| 2026-02-18 12:00 |
21:13:32.92 |
+20:49:31.7 |
HIP 104731 |
17.01 |
| 2026-02-19 00:00 |
21:13:36.18 |
+20:49:46.6 |
HIP 104731 |
17.21 |
| 2026-02-19 12:00 |
21:13:39.44 |
+20:50:01.6 |
HIP 104731 |
17.44 |
| 2026-02-20 00:00 |
21:13:42.68 |
+20:50:16.9 |
HIP 104731 |
17.69 |
| 2026-02-20 12:00 |
21:13:45.92 |
+20:50:32.4 |
HIP 104731 |
17.98 |
| 2026-02-21 00:00 |
21:13:49.15 |
+20:50:48.1 |
HIP 104731 |
18.29 |
| 2026-02-21 12:00 |
21:13:52.38 |
+20:51:04.0 |
HIP 104731 |
18.63 |
| 2026-02-22 00:00 |
21:13:55.59 |
+20:51:20.1 |
HIP 104731 |
18.99 |
| 2026-02-22 12:00 |
21:13:58.80 |
+20:51:36.4 |
HIP 104731 |
19.37 |
| 2026-02-23 00:00 |
21:14:01.99 |
+20:51:53.0 |
HIP 104731 |
19.78 |
| 2026-02-23 12:00 |
21:14:05.18 |
+20:52:09.8 |
HIP 104731 |
20.20 |
| 2026-02-24 00:00 |
21:14:08.36 |
+20:52:26.7 |
HIP 104731 |
20.64 |