113P/Spitaler
| Parameter |
Value |
| Designation |
113P/Spitaler |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-04-23T18:19:34.599360Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:26Z |
| Obs used |
879 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
8.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-07-26.0000000 |
| e |
0.42451621 |
| q (au) |
2.118865 |
| a (au) |
3.681885 |
| i (deg) |
5.776267 |
| Ω (om, deg) |
14.385093 |
| ω (w, deg) |
50.026650 |
| M (ma, deg) |
13.007213 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.379 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.379 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.854 |
| k |
0.999 |
| 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 |
| 2021-06-18 |
2022-06-01 |
+1.1076 |
-0.529 |
| 2022-06-01 |
2023-04-15 |
+5.3352 |
-1.919 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:50:48.43 |
-26:48:19.9 |
HIP 82451 |
2.79 |
| 2026-02-03 12:00 |
16:51:08.09 |
-26:49:05.8 |
HIP 82451 |
3.01 |
| 2026-02-04 00:00 |
16:51:27.62 |
-26:49:51.5 |
HIP 82512 |
5.96 |
| 2026-02-04 12:00 |
16:51:47.03 |
-26:50:37.0 |
HIP 82512 |
2.09 |
| 2026-02-05 00:00 |
16:52:06.31 |
-26:51:22.2 |
HIP 82512 |
3.42 |
| 2026-02-05 12:00 |
16:52:25.47 |
-26:52:07.2 |
HIP 82534 |
4.08 |
| 2026-02-06 00:00 |
16:52:44.50 |
-26:52:52.0 |
HIP 82534 |
7.32 |
| 2026-02-06 12:00 |
16:53:03.40 |
-26:53:36.6 |
HIP 82583 |
8.73 |
| 2026-02-07 00:00 |
16:53:22.18 |
-26:54:20.9 |
HIP 82583 |
10.99 |
| 2026-02-07 12:00 |
16:53:40.82 |
-26:55:05.0 |
HIP 82583 |
14.17 |
| 2026-02-08 00:00 |
16:53:59.34 |
-26:55:48.9 |
HIP 82583 |
17.77 |
| 2026-02-08 12:00 |
16:54:17.72 |
-26:56:32.5 |
HIP 82583 |
21.55 |
| 2026-02-09 00:00 |
16:54:35.96 |
-26:57:16.0 |
HIP 82583 |
25.43 |
| 2026-02-09 12:00 |
16:54:54.07 |
-26:57:59.2 |
HIP 82583 |
29.34 |
| 2026-02-10 00:00 |
16:55:12.05 |
-26:58:42.2 |
HIP 82583 |
33.28 |
| 2026-02-10 12:00 |
16:55:29.89 |
-26:59:25.0 |
HIP 82756 |
35.76 |
| 2026-02-11 00:00 |
16:55:47.59 |
-27:00:07.5 |
HIP 82980 |
32.84 |
| 2026-02-11 12:00 |
16:56:05.15 |
-27:00:49.8 |
HIP 82980 |
29.79 |
| 2026-02-12 00:00 |
16:56:22.57 |
-27:01:32.0 |
HIP 82980 |
26.99 |
| 2026-02-12 12:00 |
16:56:39.85 |
-27:02:13.9 |
HIP 82980 |
24.52 |
| 2026-02-13 00:00 |
16:56:56.98 |
-27:02:55.5 |
HIP 83073 |
21.18 |
| 2026-02-13 12:00 |
16:57:13.97 |
-27:03:37.0 |
HIP 83073 |
17.33 |
| 2026-02-14 00:00 |
16:57:30.82 |
-27:04:18.3 |
HIP 83073 |
13.52 |
| 2026-02-14 12:00 |
16:57:47.52 |
-27:04:59.3 |
HIP 83073 |
9.74 |
| 2026-02-15 00:00 |
16:58:04.07 |
-27:05:40.1 |
HIP 83073 |
5.99 |
| 2026-02-15 12:00 |
16:58:20.47 |
-27:06:20.7 |
HIP 83073 |
2.28 |
| 2026-02-16 00:00 |
16:58:36.72 |
-27:07:01.1 |
HIP 83073 |
1.40 |
| 2026-02-16 12:00 |
16:58:52.82 |
-27:07:41.3 |
HIP 83073 |
5.04 |
| 2026-02-17 00:00 |
16:59:08.77 |
-27:08:21.2 |
HIP 83073 |
8.65 |
| 2026-02-17 12:00 |
16:59:24.57 |
-27:09:01.0 |
HIP 83073 |
12.23 |
| 2026-02-18 00:00 |
16:59:40.21 |
-27:09:40.5 |
HIP 83195 |
14.03 |
| 2026-02-18 12:00 |
16:59:55.69 |
-27:10:19.9 |
HIP 83195 |
13.45 |
| 2026-02-19 00:00 |
17:00:11.02 |
-27:10:59.0 |
HIP 83195 |
13.76 |
| 2026-02-19 12:00 |
17:00:26.18 |
-27:11:37.9 |
HIP 83195 |
14.88 |
| 2026-02-20 00:00 |
17:00:41.19 |
-27:12:16.6 |
HIP 83195 |
16.64 |
| 2026-02-20 12:00 |
17:00:56.04 |
-27:12:55.1 |
HIP 83195 |
18.83 |
| 2026-02-21 00:00 |
17:01:10.73 |
-27:13:33.4 |
HIP 83195 |
21.30 |
| 2026-02-21 12:00 |
17:01:25.26 |
-27:14:11.5 |
HIP 83428 |
22.99 |
| 2026-02-22 00:00 |
17:01:39.62 |
-27:14:49.3 |
HIP 83428 |
19.73 |
| 2026-02-22 12:00 |
17:01:53.81 |
-27:15:27.0 |
HIP 83428 |
16.51 |
| 2026-02-23 00:00 |
17:02:07.85 |
-27:16:04.5 |
HIP 83428 |
13.34 |
| 2026-02-23 12:00 |
17:02:21.71 |
-27:16:41.7 |
HIP 83428 |
10.19 |
| 2026-02-24 00:00 |
17:02:35.41 |
-27:17:18.8 |
HIP 83428 |
7.09 |