| 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 |
-0.501 |
| 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) |
| 2026-03-26 00:00 |
14:45:22.57 |
-17:54:05.0 |
HIP 72134 |
6.15 |
| 2026-03-26 12:00 |
14:45:12.60 |
-17:53:32.7 |
HIP 72134 |
6.78 |
| 2026-03-27 00:00 |
14:45:02.47 |
-17:52:59.6 |
HIP 72134 |
8.15 |
| 2026-03-27 12:00 |
14:44:52.19 |
-17:52:25.7 |
HIP 72134 |
9.98 |
| 2026-03-28 00:00 |
14:44:41.76 |
-17:51:51.0 |
HIP 72134 |
12.10 |
| 2026-03-28 12:00 |
14:44:31.17 |
-17:51:15.6 |
HIP 72134 |
14.40 |
| 2026-03-29 00:00 |
14:44:20.44 |
-17:50:39.3 |
HIP 72134 |
16.81 |
| 2026-03-29 12:00 |
14:44:09.56 |
-17:50:02.3 |
HIP 72134 |
19.32 |
| 2026-03-30 00:00 |
14:43:58.54 |
-17:49:24.6 |
HIP 72134 |
21.90 |
| 2026-03-30 12:00 |
14:43:47.37 |
-17:48:46.0 |
HIP 71892 |
21.75 |
| 2026-03-31 00:00 |
14:43:36.06 |
-17:48:06.8 |
HIP 71892 |
19.10 |
| 2026-03-31 12:00 |
14:43:24.61 |
-17:47:26.7 |
HIP 71892 |
16.44 |
| 2026-04-01 00:00 |
14:43:13.02 |
-17:46:45.9 |
HIP 71892 |
13.82 |
| 2026-04-01 12:00 |
14:43:01.30 |
-17:46:04.4 |
HIP 71892 |
11.28 |
| 2026-04-02 00:00 |
14:42:49.44 |
-17:45:22.1 |
HIP 71892 |
8.91 |
| 2026-04-02 12:00 |
14:42:37.45 |
-17:44:39.1 |
HIP 71892 |
6.95 |
| 2026-04-03 00:00 |
14:42:25.32 |
-17:43:55.4 |
HIP 71892 |
5.88 |
| 2026-04-03 12:00 |
14:42:13.07 |
-17:43:11.0 |
HIP 71892 |
6.23 |
| 2026-04-04 00:00 |
14:42:00.69 |
-17:42:25.8 |
HIP 71892 |
7.84 |
| 2026-04-04 12:00 |
14:41:48.18 |
-17:41:39.9 |
HIP 71892 |
10.16 |
| 2026-04-05 00:00 |
14:41:35.55 |
-17:40:53.3 |
HIP 71892 |
12.84 |
| 2026-04-05 12:00 |
14:41:22.79 |
-17:40:06.0 |
HIP 71892 |
15.70 |
| 2026-04-06 00:00 |
14:41:09.92 |
-17:39:18.0 |
HIP 71892 |
18.68 |
| 2026-04-06 12:00 |
14:40:56.93 |
-17:38:29.4 |
HIP 71699 |
17.79 |
| 2026-04-07 00:00 |
14:40:43.82 |
-17:37:40.0 |
HIP 71699 |
14.93 |
| 2026-04-07 12:00 |
14:40:30.60 |
-17:36:50.0 |
HIP 71699 |
12.24 |
| 2026-04-08 00:00 |
14:40:17.27 |
-17:35:59.3 |
HIP 71699 |
9.88 |
| 2026-04-08 12:00 |
14:40:03.83 |
-17:35:07.9 |
HIP 71699 |
8.16 |
| 2026-04-09 00:00 |
14:39:50.28 |
-17:34:15.9 |
HIP 71699 |
7.59 |
| 2026-04-09 12:00 |
14:39:36.62 |
-17:33:23.2 |
HIP 71699 |
8.44 |
| 2026-04-10 00:00 |
14:39:22.86 |
-17:32:29.9 |
HIP 71699 |
10.38 |
| 2026-04-10 12:00 |
14:39:09.00 |
-17:31:36.0 |
HIP 71699 |
12.96 |
| 2026-04-11 00:00 |
14:38:55.04 |
-17:30:41.4 |
HIP 71699 |
15.89 |
| 2026-04-11 12:00 |
14:38:40.99 |
-17:29:46.3 |
HIP 71699 |
19.01 |
| 2026-04-12 00:00 |
14:38:26.84 |
-17:28:50.5 |
HIP 71699 |
22.26 |
| 2026-04-12 12:00 |
14:38:12.60 |
-17:27:54.1 |
HIP 71699 |
25.60 |
| 2026-04-13 00:00 |
14:37:58.27 |
-17:26:57.1 |
HIP 71699 |
29.00 |
| 2026-04-13 12:00 |
14:37:43.85 |
-17:25:59.6 |
HIP 71699 |
32.46 |
| 2026-04-14 00:00 |
14:37:29.35 |
-17:25:01.4 |
HIP 71699 |
35.96 |
| 2026-04-14 12:00 |
14:37:14.77 |
-17:24:02.7 |
HIP 71699 |
39.49 |
| 2026-04-15 00:00 |
14:37:00.11 |
-17:23:03.5 |
HIP 71245 |
41.49 |
| 2026-04-15 12:00 |
14:36:45.37 |
-17:22:03.7 |
HIP 71245 |
38.40 |
| 2026-04-16 00:00 |
14:36:30.55 |
-17:21:03.4 |
HIP 71245 |
35.40 |