| Parameter |
Value |
| Designation |
244P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-20T23:08:24.253440Z |
| Orbit solution date (soln_date, UTC) |
2024-06-06T23:12:46Z |
| Obs used |
1834 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-02-26.0000000 |
| e |
0.19863567 |
| q (au) |
3.920521 |
| a (au) |
4.892308 |
| i (deg) |
2.259254 |
| Ω (om, deg) |
354.132300 |
| ω (w, deg) |
92.754137 |
| M (ma, deg) |
69.863291 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.865 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.865 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-08-18 |
2024-05-27 |
+26.0623 |
-16.089 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:39:12.68 |
-17:16:37.2 |
HIP 71699 |
15.33 |
| 2026-09-20 12:00 |
14:39:33.43 |
-17:18:09.4 |
HIP 71699 |
10.88 |
| 2026-09-21 00:00 |
14:39:54.25 |
-17:19:41.9 |
HIP 71699 |
7.45 |
| 2026-09-21 12:00 |
14:40:15.15 |
-17:21:14.6 |
HIP 71699 |
6.83 |
| 2026-09-22 00:00 |
14:40:36.13 |
-17:22:47.5 |
HIP 71699 |
9.63 |
| 2026-09-22 12:00 |
14:40:57.18 |
-17:24:20.7 |
HIP 71699 |
13.93 |
| 2026-09-23 00:00 |
14:41:18.31 |
-17:25:54.1 |
HIP 71699 |
18.74 |
| 2026-09-23 12:00 |
14:41:39.51 |
-17:27:27.7 |
HIP 71892 |
23.57 |
| 2026-09-24 00:00 |
14:42:00.79 |
-17:29:01.6 |
HIP 71892 |
20.67 |
| 2026-09-24 12:00 |
14:42:22.14 |
-17:30:35.7 |
HIP 71892 |
18.83 |
| 2026-09-25 00:00 |
14:42:43.56 |
-17:32:10.0 |
HIP 71892 |
18.42 |
| 2026-09-25 12:00 |
14:43:05.06 |
-17:33:44.5 |
HIP 71892 |
19.51 |
| 2026-09-26 00:00 |
14:43:26.62 |
-17:35:19.3 |
HIP 71892 |
21.92 |
| 2026-09-26 12:00 |
14:43:48.26 |
-17:36:54.2 |
HIP 71892 |
25.26 |
| 2026-09-27 00:00 |
14:44:09.97 |
-17:38:29.4 |
HIP 72186 |
24.77 |
| 2026-09-27 12:00 |
14:44:31.75 |
-17:40:04.7 |
HIP 72186 |
19.43 |
| 2026-09-28 00:00 |
14:44:53.60 |
-17:41:40.3 |
HIP 72186 |
14.14 |
| 2026-09-28 12:00 |
14:45:15.51 |
-17:43:16.0 |
HIP 72186 |
9.03 |
| 2026-09-29 00:00 |
14:45:37.50 |
-17:44:51.9 |
HIP 72186 |
4.73 |
| 2026-09-29 12:00 |
14:45:59.55 |
-17:46:28.0 |
HIP 72186 |
4.83 |
| 2026-09-30 00:00 |
14:46:21.67 |
-17:48:04.3 |
HIP 72186 |
9.21 |
| 2026-09-30 12:00 |
14:46:43.86 |
-17:49:40.7 |
HIP 72186 |
14.40 |
| 2026-10-01 00:00 |
14:47:06.11 |
-17:51:17.3 |
HIP 72186 |
19.78 |
| 2026-10-01 12:00 |
14:47:28.43 |
-17:52:54.1 |
HIP 72186 |
25.25 |
| 2026-10-02 00:00 |
14:47:50.82 |
-17:54:31.0 |
HIP 72186 |
30.76 |
| 2026-10-02 12:00 |
14:48:13.27 |
-17:56:08.1 |
HIP 72319 |
35.16 |
| 2026-10-03 00:00 |
14:48:35.78 |
-17:57:45.4 |
HIP 72319 |
35.95 |
| 2026-10-03 12:00 |
14:48:58.36 |
-17:59:22.8 |
HIP 72319 |
37.57 |
| 2026-10-04 00:00 |
14:49:21.00 |
-18:01:00.4 |
HIP 72677 |
34.65 |
| 2026-10-04 12:00 |
14:49:43.70 |
-18:02:38.0 |
HIP 72677 |
30.54 |
| 2026-10-05 00:00 |
14:50:06.46 |
-18:04:15.9 |
HIP 72677 |
26.97 |
| 2026-10-05 12:00 |
14:50:29.29 |
-18:05:53.8 |
HIP 72677 |
24.21 |
| 2026-10-06 00:00 |
14:50:52.17 |
-18:07:31.9 |
HIP 72702 |
19.68 |
| 2026-10-06 12:00 |
14:51:15.12 |
-18:09:10.1 |
HIP 72702 |
14.88 |
| 2026-10-07 00:00 |
14:51:38.13 |
-18:10:48.5 |
HIP 72702 |
10.97 |
| 2026-10-07 12:00 |
14:52:01.19 |
-18:12:26.9 |
HIP 72702 |
9.18 |
| 2026-10-08 00:00 |
14:52:24.31 |
-18:14:05.5 |
HIP 72702 |
10.66 |
| 2026-10-08 12:00 |
14:52:47.49 |
-18:15:44.1 |
HIP 72876 |
13.93 |
| 2026-10-09 00:00 |
14:53:10.73 |
-18:17:22.9 |
HIP 72876 |
8.20 |
| 2026-10-09 12:00 |
14:53:34.02 |
-18:19:01.8 |
HIP 72876 |
2.57 |
| 2026-10-10 00:00 |
14:53:57.37 |
-18:20:40.7 |
HIP 72876 |
3.56 |
| 2026-10-10 12:00 |
14:54:20.78 |
-18:22:19.8 |
HIP 72876 |
9.26 |
| 2026-10-11 00:00 |
14:54:44.23 |
-18:23:58.9 |
HIP 72876 |
15.04 |