메타데이터
| 항목 |
값 |
| Designation |
431P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-09T08:10:57.241920Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:13:02Z |
| Obs used |
519 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
19.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-08-07.0000000 |
| e |
0.48795756 |
| q (au) |
1.762569 |
| a (au) |
3.442232 |
| i (deg) |
22.671799 |
| Ω (om, deg) |
203.270091 |
| ω (w, deg) |
199.435229 |
| M (ma, deg) |
107.668137 |
밝기
산란 + 전체 선형
$$
M_a = (12.900 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.900 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2021-09-02 |
2022-03-01 |
+12.0411 |
-3.322 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:57:10.50 |
-01:23:38.4 |
HIP 77977 |
26.62 |
| 2026-07-29 12:00 |
15:57:07.90 |
-01:24:45.8 |
HIP 77977 |
26.28 |
| 2026-07-30 00:00 |
15:57:05.51 |
-01:25:54.1 |
HIP 77977 |
26.05 |
| 2026-07-30 12:00 |
15:57:03.33 |
-01:27:03.3 |
HIP 77977 |
25.94 |
| 2026-07-31 00:00 |
15:57:01.36 |
-01:28:13.4 |
HIP 77977 |
25.95 |
| 2026-07-31 12:00 |
15:56:59.61 |
-01:29:24.3 |
HIP 77977 |
26.07 |
| 2026-08-01 00:00 |
15:56:58.08 |
-01:30:36.2 |
HIP 77977 |
26.30 |
| 2026-08-01 12:00 |
15:56:56.75 |
-01:31:48.8 |
HIP 77977 |
26.65 |
| 2026-08-02 00:00 |
15:56:55.64 |
-01:33:02.4 |
HIP 77977 |
27.10 |
| 2026-08-02 12:00 |
15:56:54.75 |
-01:34:16.8 |
HIP 77977 |
27.65 |
| 2026-08-03 00:00 |
15:56:54.06 |
-01:35:32.0 |
HIP 77977 |
28.30 |
| 2026-08-03 12:00 |
15:56:53.59 |
-01:36:48.0 |
HIP 77977 |
29.03 |
| 2026-08-04 00:00 |
15:56:53.33 |
-01:38:04.8 |
HIP 77977 |
29.85 |
| 2026-08-04 12:00 |
15:56:53.28 |
-01:39:22.5 |
HIP 77977 |
30.75 |
| 2026-08-05 00:00 |
15:56:53.45 |
-01:40:40.9 |
HIP 77977 |
31.72 |
| 2026-08-05 12:00 |
15:56:53.83 |
-01:42:00.1 |
HIP 78024 |
31.54 |
| 2026-08-06 00:00 |
15:56:54.42 |
-01:43:20.1 |
HIP 78024 |
30.44 |
| 2026-08-06 12:00 |
15:56:55.22 |
-01:44:40.8 |
HIP 78024 |
29.38 |
| 2026-08-07 00:00 |
15:56:56.24 |
-01:46:02.3 |
HIP 78024 |
28.36 |
| 2026-08-07 12:00 |
15:56:57.47 |
-01:47:24.5 |
HIP 78024 |
27.39 |
| 2026-08-08 00:00 |
15:56:58.91 |
-01:48:47.4 |
HIP 78024 |
26.49 |
| 2026-08-08 12:00 |
15:57:00.56 |
-01:50:11.1 |
HIP 78024 |
25.66 |
| 2026-08-09 00:00 |
15:57:02.42 |
-01:51:35.5 |
HIP 78024 |
24.91 |
| 2026-08-09 12:00 |
15:57:04.49 |
-01:53:00.5 |
HIP 78024 |
24.26 |
| 2026-08-10 00:00 |
15:57:06.78 |
-01:54:26.3 |
HIP 78024 |
23.72 |
| 2026-08-10 12:00 |
15:57:09.27 |
-01:55:52.7 |
HIP 78024 |
23.30 |
| 2026-08-11 00:00 |
15:57:11.98 |
-01:57:19.8 |
HIP 78024 |
23.03 |
| 2026-08-11 12:00 |
15:57:14.89 |
-01:58:47.5 |
HIP 78024 |
22.90 |
| 2026-08-12 00:00 |
15:57:18.02 |
-02:00:15.9 |
HIP 78024 |
22.93 |
| 2026-08-12 12:00 |
15:57:21.35 |
-02:01:44.9 |
HIP 78024 |
23.13 |
| 2026-08-13 00:00 |
15:57:24.89 |
-02:03:14.5 |
HIP 78024 |
23.50 |
| 2026-08-13 12:00 |
15:57:28.65 |
-02:04:44.7 |
HIP 78024 |
24.04 |
| 2026-08-14 00:00 |
15:57:32.61 |
-02:06:15.5 |
HIP 78024 |
24.74 |
| 2026-08-14 12:00 |
15:57:36.77 |
-02:07:46.9 |
HIP 78024 |
25.60 |
| 2026-08-15 00:00 |
15:57:41.15 |
-02:09:18.9 |
HIP 78024 |
26.61 |
| 2026-08-15 12:00 |
15:57:45.73 |
-02:10:51.4 |
HIP 78024 |
27.77 |
| 2026-08-16 00:00 |
15:57:50.52 |
-02:12:24.4 |
HIP 78024 |
29.06 |
| 2026-08-16 12:00 |
15:57:55.51 |
-02:13:58.0 |
HIP 78024 |
30.47 |
| 2026-08-17 00:00 |
15:58:00.71 |
-02:15:32.2 |
HIP 78024 |
32.00 |
| 2026-08-17 12:00 |
15:58:06.11 |
-02:17:06.8 |
HIP 78024 |
33.64 |
| 2026-08-18 00:00 |
15:58:11.71 |
-02:18:41.9 |
HIP 78024 |
35.37 |
| 2026-08-18 12:00 |
15:58:17.52 |
-02:20:17.5 |
HIP 78024 |
37.19 |
| 2026-08-19 00:00 |
15:58:23.52 |
-02:21:53.6 |
HIP 78024 |
39.09 |