244P/Scotti
| 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) |
| 2026-02-03 00:00 |
14:46:20.85 |
-17:35:34.2 |
HIP 72186 |
9.17 |
| 2026-02-03 12:00 |
14:46:29.67 |
-17:36:26.4 |
HIP 72186 |
10.31 |
| 2026-02-04 00:00 |
14:46:38.31 |
-17:37:17.8 |
HIP 72186 |
11.74 |
| 2026-02-04 12:00 |
14:46:46.78 |
-17:38:08.4 |
HIP 72186 |
13.36 |
| 2026-02-05 00:00 |
14:46:55.08 |
-17:38:58.3 |
HIP 72186 |
15.08 |
| 2026-02-05 12:00 |
14:47:03.21 |
-17:39:47.4 |
HIP 72186 |
16.86 |
| 2026-02-06 00:00 |
14:47:11.16 |
-17:40:35.8 |
HIP 72186 |
18.67 |
| 2026-02-06 12:00 |
14:47:18.94 |
-17:41:23.4 |
HIP 72186 |
20.48 |
| 2026-02-07 00:00 |
14:47:26.54 |
-17:42:10.2 |
HIP 72186 |
22.28 |
| 2026-02-07 12:00 |
14:47:33.96 |
-17:42:56.3 |
HIP 72186 |
24.07 |
| 2026-02-08 00:00 |
14:47:41.20 |
-17:43:41.5 |
HIP 72186 |
25.84 |
| 2026-02-08 12:00 |
14:47:48.27 |
-17:44:26.0 |
HIP 72423 |
26.16 |
| 2026-02-09 00:00 |
14:47:55.16 |
-17:45:09.7 |
HIP 72423 |
26.24 |
| 2026-02-09 12:00 |
14:48:01.86 |
-17:45:52.6 |
HIP 72423 |
26.45 |
| 2026-02-10 00:00 |
14:48:08.39 |
-17:46:34.8 |
HIP 72423 |
26.76 |
| 2026-02-10 12:00 |
14:48:14.74 |
-17:47:16.1 |
HIP 72423 |
27.16 |
| 2026-02-11 00:00 |
14:48:20.90 |
-17:47:56.7 |
HIP 72423 |
27.66 |
| 2026-02-11 12:00 |
14:48:26.88 |
-17:48:36.4 |
HIP 72423 |
28.22 |
| 2026-02-12 00:00 |
14:48:32.68 |
-17:49:15.4 |
HIP 72423 |
28.85 |
| 2026-02-12 12:00 |
14:48:38.29 |
-17:49:53.5 |
HIP 72423 |
29.53 |
| 2026-02-13 00:00 |
14:48:43.71 |
-17:50:30.9 |
HIP 72423 |
30.24 |
| 2026-02-13 12:00 |
14:48:48.96 |
-17:51:07.4 |
HIP 72423 |
30.99 |
| 2026-02-14 00:00 |
14:48:54.01 |
-17:51:43.2 |
HIP 72423 |
31.76 |
| 2026-02-14 12:00 |
14:48:58.88 |
-17:52:18.1 |
HIP 72423 |
32.55 |
| 2026-02-15 00:00 |
14:49:03.56 |
-17:52:52.2 |
HIP 72423 |
33.34 |
| 2026-02-15 12:00 |
14:49:08.05 |
-17:53:25.5 |
HIP 72423 |
34.14 |
| 2026-02-16 00:00 |
14:49:12.36 |
-17:53:58.0 |
HIP 72677 |
34.57 |
| 2026-02-16 12:00 |
14:49:16.47 |
-17:54:29.7 |
HIP 72677 |
33.71 |
| 2026-02-17 00:00 |
14:49:20.40 |
-17:55:00.5 |
HIP 72677 |
32.91 |
| 2026-02-17 12:00 |
14:49:24.13 |
-17:55:30.6 |
HIP 72677 |
32.17 |
| 2026-02-18 00:00 |
14:49:27.68 |
-17:55:59.8 |
HIP 72677 |
31.48 |
| 2026-02-18 12:00 |
14:49:31.03 |
-17:56:28.2 |
HIP 72677 |
30.85 |
| 2026-02-19 00:00 |
14:49:34.19 |
-17:56:55.7 |
HIP 72677 |
30.27 |
| 2026-02-19 12:00 |
14:49:37.16 |
-17:57:22.5 |
HIP 72677 |
29.75 |
| 2026-02-20 00:00 |
14:49:39.94 |
-17:57:48.4 |
HIP 72677 |
29.28 |
| 2026-02-20 12:00 |
14:49:42.53 |
-17:58:13.4 |
HIP 72677 |
28.86 |
| 2026-02-21 00:00 |
14:49:44.92 |
-17:58:37.7 |
HIP 72677 |
28.49 |
| 2026-02-21 12:00 |
14:49:47.13 |
-17:59:01.1 |
HIP 72677 |
28.16 |
| 2026-02-22 00:00 |
14:49:49.14 |
-17:59:23.6 |
HIP 72677 |
27.89 |
| 2026-02-22 12:00 |
14:49:50.95 |
-17:59:45.4 |
HIP 72677 |
27.66 |
| 2026-02-23 00:00 |
14:49:52.58 |
-18:00:06.3 |
HIP 72677 |
27.47 |
| 2026-02-23 12:00 |
14:49:54.01 |
-18:00:26.3 |
HIP 72677 |
27.33 |
| 2026-02-24 00:00 |
14:49:55.24 |
-18:00:45.6 |
HIP 72677 |
27.22 |