| 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) |
| 2026-05-12 00:00 |
20:52:35.47 |
-05:03:09.4 |
HIP 103020 |
21.41 |
| 2026-05-12 12:00 |
20:52:34.87 |
-05:03:03.0 |
HIP 103020 |
21.28 |
| 2026-05-13 00:00 |
20:52:34.23 |
-05:02:56.7 |
HIP 103020 |
21.14 |
| 2026-05-13 12:00 |
20:52:33.55 |
-05:02:50.6 |
HIP 103020 |
21.01 |
| 2026-05-14 00:00 |
20:52:32.83 |
-05:02:44.7 |
HIP 103020 |
20.88 |
| 2026-05-14 12:00 |
20:52:32.07 |
-05:02:39.0 |
HIP 103020 |
20.76 |
| 2026-05-15 00:00 |
20:52:31.26 |
-05:02:33.4 |
HIP 103020 |
20.64 |
| 2026-05-15 12:00 |
20:52:30.42 |
-05:02:28.1 |
HIP 103020 |
20.52 |
| 2026-05-16 00:00 |
20:52:29.54 |
-05:02:23.0 |
HIP 103020 |
20.41 |
| 2026-05-16 12:00 |
20:52:28.61 |
-05:02:18.1 |
HIP 103020 |
20.29 |
| 2026-05-17 00:00 |
20:52:27.65 |
-05:02:13.3 |
HIP 103020 |
20.19 |
| 2026-05-17 12:00 |
20:52:26.64 |
-05:02:08.8 |
HIP 103020 |
20.09 |
| 2026-05-18 00:00 |
20:52:25.60 |
-05:02:04.5 |
HIP 103020 |
19.99 |
| 2026-05-18 12:00 |
20:52:24.51 |
-05:02:00.4 |
HIP 103020 |
19.90 |
| 2026-05-19 00:00 |
20:52:23.38 |
-05:01:56.4 |
HIP 103020 |
19.82 |
| 2026-05-19 12:00 |
20:52:22.22 |
-05:01:52.7 |
HIP 103020 |
19.74 |
| 2026-05-20 00:00 |
20:52:21.01 |
-05:01:49.2 |
HIP 103020 |
19.67 |
| 2026-05-20 12:00 |
20:52:19.76 |
-05:01:45.9 |
HIP 103020 |
19.61 |
| 2026-05-21 00:00 |
20:52:18.48 |
-05:01:42.8 |
HIP 103020 |
19.56 |
| 2026-05-21 12:00 |
20:52:17.15 |
-05:01:39.9 |
HIP 103020 |
19.51 |
| 2026-05-22 00:00 |
20:52:15.78 |
-05:01:37.2 |
HIP 103020 |
19.48 |
| 2026-05-22 12:00 |
20:52:14.38 |
-05:01:34.7 |
HIP 103020 |
19.45 |
| 2026-05-23 00:00 |
20:52:12.93 |
-05:01:32.4 |
HIP 103020 |
19.44 |
| 2026-05-23 12:00 |
20:52:11.45 |
-05:01:30.3 |
HIP 103020 |
19.44 |
| 2026-05-24 00:00 |
20:52:09.93 |
-05:01:28.4 |
HIP 103020 |
19.44 |
| 2026-05-24 12:00 |
20:52:08.37 |
-05:01:26.8 |
HIP 103020 |
19.46 |
| 2026-05-25 00:00 |
20:52:06.76 |
-05:01:25.3 |
HIP 103020 |
19.50 |
| 2026-05-25 12:00 |
20:52:05.13 |
-05:01:24.1 |
HIP 103020 |
19.54 |
| 2026-05-26 00:00 |
20:52:03.45 |
-05:01:23.0 |
HIP 103020 |
19.60 |
| 2026-05-26 12:00 |
20:52:01.73 |
-05:01:22.2 |
HIP 103020 |
19.68 |
| 2026-05-27 00:00 |
20:51:59.98 |
-05:01:21.6 |
HIP 103020 |
19.77 |
| 2026-05-27 12:00 |
20:51:58.19 |
-05:01:21.2 |
HIP 103020 |
19.87 |
| 2026-05-28 00:00 |
20:51:56.36 |
-05:01:21.0 |
HIP 103020 |
19.99 |
| 2026-05-28 12:00 |
20:51:54.49 |
-05:01:21.0 |
HIP 103020 |
20.13 |
| 2026-05-29 00:00 |
20:51:52.58 |
-05:01:21.3 |
HIP 103020 |
20.28 |
| 2026-05-29 12:00 |
20:51:50.64 |
-05:01:21.7 |
HIP 103020 |
20.44 |
| 2026-05-30 00:00 |
20:51:48.66 |
-05:01:22.4 |
HIP 103020 |
20.63 |
| 2026-05-30 12:00 |
20:51:46.64 |
-05:01:23.3 |
HIP 103020 |
20.83 |
| 2026-05-31 00:00 |
20:51:44.58 |
-05:01:24.4 |
HIP 102894 |
20.89 |
| 2026-05-31 12:00 |
20:51:42.49 |
-05:01:25.7 |
HIP 102894 |
20.52 |
| 2026-06-01 00:00 |
20:51:40.36 |
-05:01:27.2 |
HIP 102894 |
20.15 |
| 2026-06-01 12:00 |
20:51:38.20 |
-05:01:28.9 |
HIP 102894 |
19.78 |
| 2026-06-02 00:00 |
20:51:36.00 |
-05:01:30.9 |
HIP 102894 |
19.43 |