| Parameter |
Value |
| Designation |
15P/Finlay |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-12-27T01:44:35.957760Z |
| Orbit solution date (soln_date, UTC) |
2024-04-16T11:19:30Z |
| Obs used |
1655 |
| NEO |
Yes |
| M1 |
14.900 |
| K1 |
8.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-11-01.0000000 |
| e |
0.72018544 |
| q (au) |
0.976687 |
| a (au) |
3.490479 |
| i (deg) |
6.800480 |
| Ω (om, deg) |
13.753875 |
| ω (w, deg) |
347.625750 |
| M (ma, deg) |
46.690962 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.416 + 5.627\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.416 |
| n |
5.627 |
| gf |
1.000 |
| gb |
-0.643 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2021-04-10 |
2022-03-03 |
+4.0180 |
-1.591 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
12:54:28.04 |
-07:29:23.2 |
HIP 62991 |
7.24 |
| 2026-06-01 12:00 |
12:54:18.99 |
-07:28:31.5 |
HIP 62991 |
8.33 |
| 2026-06-02 00:00 |
12:54:10.13 |
-07:27:41.0 |
HIP 62991 |
9.86 |
| 2026-06-02 12:00 |
12:54:01.46 |
-07:26:51.5 |
HIP 62991 |
11.62 |
| 2026-06-03 00:00 |
12:53:52.99 |
-07:26:03.3 |
HIP 62991 |
13.50 |
| 2026-06-03 12:00 |
12:53:44.71 |
-07:25:16.1 |
HIP 62991 |
15.43 |
| 2026-06-04 00:00 |
12:53:36.63 |
-07:24:30.1 |
HIP 62991 |
17.38 |
| 2026-06-04 12:00 |
12:53:28.75 |
-07:23:45.2 |
HIP 62851 |
17.94 |
| 2026-06-05 00:00 |
12:53:21.06 |
-07:23:01.5 |
HIP 62851 |
16.52 |
| 2026-06-05 12:00 |
12:53:13.56 |
-07:22:18.9 |
HIP 62851 |
15.28 |
| 2026-06-06 00:00 |
12:53:06.27 |
-07:21:37.5 |
HIP 62851 |
14.24 |
| 2026-06-06 12:00 |
12:52:59.17 |
-07:20:57.3 |
HIP 62851 |
13.42 |
| 2026-06-07 00:00 |
12:52:52.26 |
-07:20:18.2 |
HIP 62851 |
12.83 |
| 2026-06-07 12:00 |
12:52:45.56 |
-07:19:40.3 |
HIP 62851 |
12.50 |
| 2026-06-08 00:00 |
12:52:39.05 |
-07:19:03.6 |
HIP 62851 |
12.42 |
| 2026-06-08 12:00 |
12:52:32.74 |
-07:18:28.0 |
HIP 62851 |
12.57 |
| 2026-06-09 00:00 |
12:52:26.63 |
-07:17:53.7 |
HIP 62851 |
12.92 |
| 2026-06-09 12:00 |
12:52:20.72 |
-07:17:20.5 |
HIP 62851 |
13.44 |
| 2026-06-10 00:00 |
12:52:15.01 |
-07:16:48.5 |
HIP 62851 |
14.09 |
| 2026-06-10 12:00 |
12:52:09.50 |
-07:16:17.6 |
HIP 62851 |
14.84 |
| 2026-06-11 00:00 |
12:52:04.18 |
-07:15:48.0 |
HIP 62851 |
15.65 |
| 2026-06-11 12:00 |
12:51:59.07 |
-07:15:19.6 |
HIP 62851 |
16.52 |
| 2026-06-12 00:00 |
12:51:54.16 |
-07:14:52.4 |
HIP 62851 |
17.40 |
| 2026-06-12 12:00 |
12:51:49.44 |
-07:14:26.3 |
HIP 62851 |
18.30 |
| 2026-06-13 00:00 |
12:51:44.93 |
-07:14:01.5 |
HIP 62727 |
18.90 |
| 2026-06-13 12:00 |
12:51:40.62 |
-07:13:37.9 |
HIP 62727 |
18.13 |
| 2026-06-14 00:00 |
12:51:36.50 |
-07:13:15.5 |
HIP 62727 |
17.44 |
| 2026-06-14 12:00 |
12:51:32.59 |
-07:12:54.3 |
HIP 62727 |
16.82 |
| 2026-06-15 00:00 |
12:51:28.88 |
-07:12:34.3 |
HIP 62727 |
16.27 |
| 2026-06-15 12:00 |
12:51:25.37 |
-07:12:15.5 |
HIP 62727 |
15.79 |
| 2026-06-16 00:00 |
12:51:22.06 |
-07:11:57.9 |
HIP 62727 |
15.38 |
| 2026-06-16 12:00 |
12:51:18.95 |
-07:11:41.6 |
HIP 62727 |
15.04 |
| 2026-06-17 00:00 |
12:51:16.03 |
-07:11:26.4 |
HIP 62727 |
14.75 |
| 2026-06-17 12:00 |
12:51:13.32 |
-07:11:12.5 |
HIP 62727 |
14.51 |
| 2026-06-18 00:00 |
12:51:10.81 |
-07:10:59.8 |
HIP 62727 |
14.33 |
| 2026-06-18 12:00 |
12:51:08.50 |
-07:10:48.3 |
HIP 62727 |
14.18 |
| 2026-06-19 00:00 |
12:51:06.39 |
-07:10:38.0 |
HIP 62727 |
14.08 |
| 2026-06-19 12:00 |
12:51:04.47 |
-07:10:28.9 |
HIP 62727 |
14.00 |
| 2026-06-20 00:00 |
12:51:02.75 |
-07:10:21.0 |
HIP 62727 |
13.96 |
| 2026-06-20 12:00 |
12:51:01.24 |
-07:10:14.3 |
HIP 62727 |
13.93 |
| 2026-06-21 00:00 |
12:50:59.91 |
-07:10:08.8 |
HIP 62727 |
13.92 |
| 2026-06-21 12:00 |
12:50:58.79 |
-07:10:04.6 |
HIP 62727 |
13.93 |
| 2026-06-22 00:00 |
12:50:57.86 |
-07:10:01.5 |
HIP 62727 |
13.95 |