| Parameter |
Value |
| Designation |
C/2015 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-05-15T04:24:32.302080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
573 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
21.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-02-29.0000000 |
| e |
0.99138537 |
| q (au) |
2.514054 |
| a (au) |
291.835567 |
| i (deg) |
71.219035 |
| Ω (om, deg) |
135.777778 |
| ω (w, deg) |
24.710558 |
| M (ma, deg) |
359.984939 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.720 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.720 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.760 |
| k |
0.996 |
| 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 |
20:50:32.98 |
-05:24:24.0 |
HIP 102829 |
18.06 |
| 2026-03-26 12:00 |
20:50:36.02 |
-05:24:05.6 |
HIP 102829 |
18.20 |
| 2026-03-27 00:00 |
20:50:39.03 |
-05:23:47.3 |
HIP 102945 |
18.04 |
| 2026-03-27 12:00 |
20:50:42.00 |
-05:23:29.1 |
HIP 102945 |
17.82 |
| 2026-03-28 00:00 |
20:50:44.94 |
-05:23:10.9 |
HIP 102945 |
17.63 |
| 2026-03-28 12:00 |
20:50:47.84 |
-05:22:52.7 |
HIP 102945 |
17.47 |
| 2026-03-29 00:00 |
20:50:50.71 |
-05:22:34.6 |
HIP 102945 |
17.36 |
| 2026-03-29 12:00 |
20:50:53.55 |
-05:22:16.6 |
HIP 102945 |
17.28 |
| 2026-03-30 00:00 |
20:50:56.36 |
-05:21:58.7 |
HIP 102945 |
17.24 |
| 2026-03-30 12:00 |
20:50:59.12 |
-05:21:40.8 |
HIP 102945 |
17.24 |
| 2026-03-31 00:00 |
20:51:01.86 |
-05:21:23.0 |
HIP 102945 |
17.27 |
| 2026-03-31 12:00 |
20:51:04.56 |
-05:21:05.2 |
HIP 102945 |
17.33 |
| 2026-04-01 00:00 |
20:51:07.23 |
-05:20:47.5 |
HIP 102945 |
17.42 |
| 2026-04-01 12:00 |
20:51:09.86 |
-05:20:29.9 |
HIP 102945 |
17.55 |
| 2026-04-02 00:00 |
20:51:12.45 |
-05:20:12.4 |
HIP 103005 |
17.33 |
| 2026-04-02 12:00 |
20:51:15.01 |
-05:19:54.9 |
HIP 103005 |
17.00 |
| 2026-04-03 00:00 |
20:51:17.54 |
-05:19:37.6 |
HIP 103005 |
16.69 |
| 2026-04-03 12:00 |
20:51:20.03 |
-05:19:20.3 |
HIP 103005 |
16.42 |
| 2026-04-04 00:00 |
20:51:22.48 |
-05:19:03.0 |
HIP 103005 |
16.17 |
| 2026-04-04 12:00 |
20:51:24.90 |
-05:18:45.9 |
HIP 103005 |
15.96 |
| 2026-04-05 00:00 |
20:51:27.28 |
-05:18:28.8 |
HIP 103005 |
15.77 |
| 2026-04-05 12:00 |
20:51:29.63 |
-05:18:11.9 |
HIP 103005 |
15.62 |
| 2026-04-06 00:00 |
20:51:31.94 |
-05:17:55.0 |
HIP 103005 |
15.49 |
| 2026-04-06 12:00 |
20:51:34.21 |
-05:17:38.2 |
HIP 103005 |
15.40 |
| 2026-04-07 00:00 |
20:51:36.45 |
-05:17:21.5 |
HIP 103005 |
15.33 |
| 2026-04-07 12:00 |
20:51:38.65 |
-05:17:04.9 |
HIP 103005 |
15.29 |
| 2026-04-08 00:00 |
20:51:40.81 |
-05:16:48.4 |
HIP 103005 |
15.28 |
| 2026-04-08 12:00 |
20:51:42.94 |
-05:16:31.9 |
HIP 103005 |
15.30 |
| 2026-04-09 00:00 |
20:51:45.03 |
-05:16:15.6 |
HIP 103005 |
15.34 |
| 2026-04-09 12:00 |
20:51:47.08 |
-05:15:59.4 |
HIP 103005 |
15.40 |
| 2026-04-10 00:00 |
20:51:49.09 |
-05:15:43.2 |
HIP 103005 |
15.49 |
| 2026-04-10 12:00 |
20:51:51.07 |
-05:15:27.2 |
HIP 103005 |
15.60 |
| 2026-04-11 00:00 |
20:51:53.01 |
-05:15:11.3 |
HIP 103005 |
15.73 |
| 2026-04-11 12:00 |
20:51:54.91 |
-05:14:55.4 |
HIP 103005 |
15.87 |
| 2026-04-12 00:00 |
20:51:56.77 |
-05:14:39.7 |
HIP 103005 |
16.04 |
| 2026-04-12 12:00 |
20:51:58.60 |
-05:14:24.1 |
HIP 103005 |
16.22 |
| 2026-04-13 00:00 |
20:52:00.38 |
-05:14:08.6 |
HIP 103005 |
16.41 |
| 2026-04-13 12:00 |
20:52:02.13 |
-05:13:53.2 |
HIP 103005 |
16.62 |
| 2026-04-14 00:00 |
20:52:03.84 |
-05:13:37.9 |
HIP 103005 |
16.83 |
| 2026-04-14 12:00 |
20:52:05.51 |
-05:13:22.8 |
HIP 103005 |
17.06 |
| 2026-04-15 00:00 |
20:52:07.14 |
-05:13:07.7 |
HIP 103005 |
17.30 |
| 2026-04-15 12:00 |
20:52:08.74 |
-05:12:52.8 |
HIP 103005 |
17.54 |
| 2026-04-16 00:00 |
20:52:10.29 |
-05:12:38.0 |
HIP 103005 |
17.79 |