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) |
| 2026-05-12 00:00 |
16:35:29.77 |
-02:50:07.7 |
HIP 81365 |
24.84 |
| 2026-05-12 12:00 |
16:35:12.12 |
-02:47:56.3 |
HIP 81365 |
28.19 |
| 2026-05-13 00:00 |
16:34:54.35 |
-02:45:45.7 |
HIP 81206 |
31.92 |
| 2026-05-13 12:00 |
16:34:36.48 |
-02:43:36.0 |
HIP 81206 |
30.78 |
| 2026-05-14 00:00 |
16:34:18.50 |
-02:41:27.1 |
HIP 81206 |
30.43 |
| 2026-05-14 12:00 |
16:34:00.41 |
-02:39:19.0 |
HIP 81206 |
30.91 |
| 2026-05-15 00:00 |
16:33:42.23 |
-02:37:11.8 |
HIP 81206 |
32.21 |
| 2026-05-15 12:00 |
16:33:23.95 |
-02:35:05.5 |
HIP 80949 |
31.46 |
| 2026-05-16 00:00 |
16:33:05.57 |
-02:33:00.1 |
HIP 80949 |
26.59 |
| 2026-05-16 12:00 |
16:32:47.10 |
-02:30:55.6 |
HIP 80949 |
21.79 |
| 2026-05-17 00:00 |
16:32:28.55 |
-02:28:52.0 |
HIP 80949 |
17.14 |
| 2026-05-17 12:00 |
16:32:09.90 |
-02:26:49.4 |
HIP 80949 |
12.82 |
| 2026-05-18 00:00 |
16:31:51.18 |
-02:24:47.8 |
HIP 80949 |
9.32 |
| 2026-05-18 12:00 |
16:31:32.37 |
-02:22:47.2 |
HIP 80949 |
7.86 |
| 2026-05-19 00:00 |
16:31:13.50 |
-02:20:47.5 |
HIP 80872 |
6.60 |
| 2026-05-19 12:00 |
16:30:54.54 |
-02:18:48.9 |
HIP 80872 |
1.47 |
| 2026-05-20 00:00 |
16:30:35.52 |
-02:16:51.3 |
HIP 80872 |
3.67 |
| 2026-05-20 12:00 |
16:30:16.44 |
-02:14:54.8 |
HIP 80872 |
8.82 |
| 2026-05-21 00:00 |
16:29:57.29 |
-02:12:59.3 |
HIP 80872 |
13.97 |
| 2026-05-21 12:00 |
16:29:38.08 |
-02:11:04.8 |
HIP 80694 |
17.64 |
| 2026-05-22 00:00 |
16:29:18.81 |
-02:09:11.5 |
HIP 80694 |
14.59 |
| 2026-05-22 12:00 |
16:28:59.49 |
-02:07:19.3 |
HIP 80694 |
12.93 |
| 2026-05-23 00:00 |
16:28:40.12 |
-02:05:28.2 |
HIP 80694 |
13.22 |
| 2026-05-23 12:00 |
16:28:20.71 |
-02:03:38.2 |
HIP 80694 |
15.34 |
| 2026-05-24 00:00 |
16:28:01.25 |
-02:01:49.3 |
HIP 80694 |
18.69 |
| 2026-05-24 12:00 |
16:27:41.75 |
-02:00:01.6 |
HIP 80694 |
22.73 |
| 2026-05-25 00:00 |
16:27:22.21 |
-01:58:15.0 |
HIP 80694 |
27.16 |
| 2026-05-25 12:00 |
16:27:02.64 |
-01:56:29.7 |
HIP 80694 |
31.81 |
| 2026-05-26 00:00 |
16:26:43.03 |
-01:54:45.5 |
HIP 80694 |
36.60 |
| 2026-05-26 12:00 |
16:26:23.40 |
-01:53:02.5 |
HIP 80694 |
41.49 |
| 2026-05-27 00:00 |
16:26:03.75 |
-01:51:20.7 |
HIP 80306 |
42.75 |
| 2026-05-27 12:00 |
16:25:44.07 |
-01:49:40.1 |
HIP 80306 |
39.91 |
| 2026-05-28 00:00 |
16:25:24.38 |
-01:48:00.8 |
HIP 80306 |
37.56 |
| 2026-05-28 12:00 |
16:25:04.67 |
-01:46:22.7 |
HIP 80306 |
35.79 |
| 2026-05-29 00:00 |
16:24:44.94 |
-01:44:45.9 |
HIP 80306 |
34.70 |
| 2026-05-29 12:00 |
16:24:25.21 |
-01:43:10.3 |
HIP 80227 |
34.25 |
| 2026-05-30 00:00 |
16:24:05.47 |
-01:41:36.0 |
HIP 80227 |
31.71 |
| 2026-05-30 12:00 |
16:23:45.73 |
-01:40:02.9 |
HIP 80227 |
29.85 |
| 2026-05-31 00:00 |
16:23:25.99 |
-01:38:31.2 |
HIP 80227 |
28.78 |
| 2026-05-31 12:00 |
16:23:06.25 |
-01:37:00.8 |
HIP 80227 |
28.61 |
| 2026-06-01 00:00 |
16:22:46.52 |
-01:35:31.7 |
HIP 80120 |
28.06 |
| 2026-06-01 12:00 |
16:22:26.80 |
-01:34:03.9 |
HIP 80120 |
25.30 |
| 2026-06-02 00:00 |
16:22:07.09 |
-01:32:37.4 |
HIP 80120 |
23.34 |