| Parameter |
Value |
| Designation |
C/2012 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-01-18T04:43:29.334720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:29Z |
| Obs used |
139 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-01-17.0000000 |
| e |
0.94686433 |
| q (au) |
2.016201 |
| a (au) |
37.944395 |
| i (deg) |
20.959420 |
| Ω (om, deg) |
193.245089 |
| ω (w, deg) |
268.830766 |
| M (ma, deg) |
359.994953 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.253 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.253 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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 |
16:56:16.08 |
-03:58:03.8 |
HIP 82905 |
12.47 |
| 2026-09-20 12:00 |
16:56:17.35 |
-03:58:25.0 |
HIP 82905 |
12.04 |
| 2026-09-21 00:00 |
16:56:18.65 |
-03:58:46.2 |
HIP 82905 |
11.62 |
| 2026-09-21 12:00 |
16:56:19.99 |
-03:59:07.4 |
HIP 82905 |
11.19 |
| 2026-09-22 00:00 |
16:56:21.36 |
-03:59:28.6 |
HIP 82905 |
10.77 |
| 2026-09-22 12:00 |
16:56:22.77 |
-03:59:49.8 |
HIP 82905 |
10.36 |
| 2026-09-23 00:00 |
16:56:24.21 |
-04:00:11.0 |
HIP 82905 |
9.95 |
| 2026-09-23 12:00 |
16:56:25.68 |
-04:00:32.2 |
HIP 82905 |
9.55 |
| 2026-09-24 00:00 |
16:56:27.19 |
-04:00:53.4 |
HIP 82905 |
9.16 |
| 2026-09-24 12:00 |
16:56:28.73 |
-04:01:14.6 |
HIP 82905 |
8.79 |
| 2026-09-25 00:00 |
16:56:30.31 |
-04:01:35.8 |
HIP 82905 |
8.43 |
| 2026-09-25 12:00 |
16:56:31.92 |
-04:01:56.9 |
HIP 82905 |
8.09 |
| 2026-09-26 00:00 |
16:56:33.56 |
-04:02:18.1 |
HIP 82905 |
7.77 |
| 2026-09-26 12:00 |
16:56:35.24 |
-04:02:39.2 |
HIP 82905 |
7.48 |
| 2026-09-27 00:00 |
16:56:36.95 |
-04:03:00.3 |
HIP 82905 |
7.22 |
| 2026-09-27 12:00 |
16:56:38.70 |
-04:03:21.5 |
HIP 82905 |
7.00 |
| 2026-09-28 00:00 |
16:56:40.47 |
-04:03:42.5 |
HIP 82905 |
6.82 |
| 2026-09-28 12:00 |
16:56:42.28 |
-04:04:03.6 |
HIP 82905 |
6.68 |
| 2026-09-29 00:00 |
16:56:44.13 |
-04:04:24.7 |
HIP 82905 |
6.60 |
| 2026-09-29 12:00 |
16:56:46.00 |
-04:04:45.7 |
HIP 82905 |
6.58 |
| 2026-09-30 00:00 |
16:56:47.91 |
-04:05:06.7 |
HIP 82905 |
6.61 |
| 2026-09-30 12:00 |
16:56:49.85 |
-04:05:27.7 |
HIP 82905 |
6.70 |
| 2026-10-01 00:00 |
16:56:51.83 |
-04:05:48.7 |
HIP 82905 |
6.85 |
| 2026-10-01 12:00 |
16:56:53.84 |
-04:06:09.6 |
HIP 82905 |
7.05 |
| 2026-10-02 00:00 |
16:56:55.88 |
-04:06:30.6 |
HIP 82905 |
7.31 |
| 2026-10-02 12:00 |
16:56:57.95 |
-04:06:51.4 |
HIP 82905 |
7.61 |
| 2026-10-03 00:00 |
16:57:00.05 |
-04:07:12.3 |
HIP 82905 |
7.96 |
| 2026-10-03 12:00 |
16:57:02.19 |
-04:07:33.1 |
HIP 82905 |
8.35 |
| 2026-10-04 00:00 |
16:57:04.35 |
-04:07:53.9 |
HIP 82905 |
8.78 |
| 2026-10-04 12:00 |
16:57:06.55 |
-04:08:14.7 |
HIP 82905 |
9.24 |
| 2026-10-05 00:00 |
16:57:08.78 |
-04:08:35.4 |
HIP 82905 |
9.73 |
| 2026-10-05 12:00 |
16:57:11.05 |
-04:08:56.1 |
HIP 82905 |
10.25 |
| 2026-10-06 00:00 |
16:57:13.34 |
-04:09:16.7 |
HIP 82905 |
10.79 |
| 2026-10-06 12:00 |
16:57:15.67 |
-04:09:37.3 |
HIP 82905 |
11.35 |
| 2026-10-07 00:00 |
16:57:18.02 |
-04:09:57.9 |
HIP 82905 |
11.93 |
| 2026-10-07 12:00 |
16:57:20.41 |
-04:10:18.4 |
HIP 82905 |
12.53 |
| 2026-10-08 00:00 |
16:57:22.83 |
-04:10:38.9 |
HIP 82905 |
13.14 |
| 2026-10-08 12:00 |
16:57:25.28 |
-04:10:59.3 |
HIP 82905 |
13.77 |
| 2026-10-09 00:00 |
16:57:27.76 |
-04:11:19.6 |
HIP 82905 |
14.41 |
| 2026-10-09 12:00 |
16:57:30.27 |
-04:11:40.0 |
HIP 82905 |
15.07 |
| 2026-10-10 00:00 |
16:57:32.81 |
-04:12:00.2 |
HIP 83058 |
14.37 |
| 2026-10-10 12:00 |
16:57:35.38 |
-04:12:20.4 |
HIP 83058 |
13.65 |
| 2026-10-11 00:00 |
16:57:37.98 |
-04:12:40.6 |
HIP 83058 |
12.93 |