메타데이터
| 항목 |
값 |
| Designation |
323P/SOHO |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-17T15:09:04.803840Z |
| Orbit solution date (soln_date, UTC) |
2025-02-20T14:38:09Z |
| Obs used |
171 |
| NEO |
Yes |
| M1 |
23.400 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-03-03.0000000 |
| e |
0.98481410 |
| q (au) |
0.039207 |
| a (au) |
2.581828 |
| i (deg) |
5.369972 |
| Ω (om, deg) |
324.229171 |
| ω (w, deg) |
353.174495 |
| M (ma, deg) |
10.541190 |
밝기
산란 + 전체 선형
$$
M_a = (20.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
20.000 |
| 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 |
| 2025-01-27 |
2025-02-08 |
-17.3579 |
+3.208 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
08:13:04.39 |
+21:09:17.0 |
HIP 40404 |
26.28 |
| 2026-03-26 12:00 |
08:12:53.48 |
+21:09:38.9 |
HIP 40266 |
27.82 |
| 2026-03-27 00:00 |
08:12:42.89 |
+21:09:59.8 |
HIP 40266 |
28.19 |
| 2026-03-27 12:00 |
08:12:32.60 |
+21:10:19.7 |
HIP 40266 |
28.76 |
| 2026-03-28 00:00 |
08:12:22.62 |
+21:10:38.7 |
HIP 40266 |
29.49 |
| 2026-03-28 12:00 |
08:12:12.95 |
+21:10:56.7 |
HIP 40266 |
30.37 |
| 2026-03-29 00:00 |
08:12:03.58 |
+21:11:13.8 |
HIP 40054 |
29.41 |
| 2026-03-29 12:00 |
08:11:54.52 |
+21:11:29.9 |
HIP 40054 |
28.53 |
| 2026-03-30 00:00 |
08:11:45.76 |
+21:11:45.1 |
HIP 40054 |
27.80 |
| 2026-03-30 12:00 |
08:11:37.29 |
+21:11:59.3 |
HIP 40054 |
27.21 |
| 2026-03-31 00:00 |
08:11:29.13 |
+21:12:12.6 |
HIP 40054 |
26.77 |
| 2026-03-31 12:00 |
08:11:21.27 |
+21:12:25.1 |
HIP 40054 |
26.46 |
| 2026-04-01 00:00 |
08:11:13.70 |
+21:12:36.6 |
HIP 40054 |
26.28 |
| 2026-04-01 12:00 |
08:11:06.42 |
+21:12:47.2 |
HIP 40054 |
26.21 |
| 2026-04-02 00:00 |
08:10:59.44 |
+21:12:56.9 |
HIP 40054 |
26.24 |
| 2026-04-02 12:00 |
08:10:52.75 |
+21:13:05.8 |
HIP 40054 |
26.35 |
| 2026-04-03 00:00 |
08:10:46.34 |
+21:13:13.8 |
HIP 40054 |
26.54 |
| 2026-04-03 12:00 |
08:10:40.23 |
+21:13:20.9 |
HIP 40054 |
26.79 |
| 2026-04-04 00:00 |
08:10:34.41 |
+21:13:27.2 |
HIP 40054 |
27.09 |
| 2026-04-04 12:00 |
08:10:28.86 |
+21:13:32.6 |
HIP 40054 |
27.42 |
| 2026-04-05 00:00 |
08:10:23.61 |
+21:13:37.2 |
HIP 40054 |
27.78 |
| 2026-04-05 12:00 |
08:10:18.63 |
+21:13:41.0 |
HIP 40054 |
28.16 |
| 2026-04-06 00:00 |
08:10:13.94 |
+21:13:43.9 |
HIP 40054 |
28.54 |
| 2026-04-06 12:00 |
08:10:09.52 |
+21:13:46.0 |
HIP 39826 |
28.07 |
| 2026-04-07 00:00 |
08:10:05.39 |
+21:13:47.3 |
HIP 39826 |
27.15 |
| 2026-04-07 12:00 |
08:10:01.52 |
+21:13:47.8 |
HIP 39826 |
26.29 |
| 2026-04-08 00:00 |
08:09:57.94 |
+21:13:47.5 |
HIP 39826 |
25.49 |
| 2026-04-08 12:00 |
08:09:54.62 |
+21:13:46.4 |
HIP 39826 |
24.74 |
| 2026-04-09 00:00 |
08:09:51.58 |
+21:13:44.5 |
HIP 39826 |
24.06 |
| 2026-04-09 12:00 |
08:09:48.81 |
+21:13:41.8 |
HIP 39826 |
23.43 |
| 2026-04-10 00:00 |
08:09:46.30 |
+21:13:38.3 |
HIP 39826 |
22.86 |
| 2026-04-10 12:00 |
08:09:44.07 |
+21:13:34.1 |
HIP 39826 |
22.34 |
| 2026-04-11 00:00 |
08:09:42.09 |
+21:13:29.1 |
HIP 39826 |
21.88 |
| 2026-04-11 12:00 |
08:09:40.38 |
+21:13:23.3 |
HIP 39826 |
21.47 |
| 2026-04-12 00:00 |
08:09:38.94 |
+21:13:16.8 |
HIP 39826 |
21.12 |
| 2026-04-12 12:00 |
08:09:37.75 |
+21:13:09.6 |
HIP 39826 |
20.82 |
| 2026-04-13 00:00 |
08:09:36.82 |
+21:13:01.5 |
HIP 39826 |
20.57 |
| 2026-04-13 12:00 |
08:09:36.15 |
+21:12:52.8 |
HIP 39826 |
20.37 |
| 2026-04-14 00:00 |
08:09:35.74 |
+21:12:43.3 |
HIP 39826 |
20.23 |
| 2026-04-14 12:00 |
08:09:35.57 |
+21:12:33.1 |
HIP 39826 |
20.14 |
| 2026-04-15 00:00 |
08:09:35.66 |
+21:12:22.2 |
HIP 39826 |
20.11 |
| 2026-04-15 12:00 |
08:09:36.00 |
+21:12:10.6 |
HIP 39826 |
20.13 |
| 2026-04-16 00:00 |
08:09:36.59 |
+21:11:58.2 |
HIP 39826 |
20.20 |