메타데이터
| 항목 |
값 |
| Designation |
487P/Siding Spring |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-10-20T18:47:47.019840Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:51Z |
| Obs used |
1401 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
12.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-07-05T08:27:27.360000Z |
| Discovery magnitude (MPC) |
19.10 V |
| Discovery observatory (MPC) |
I47 · Pierre Auger Observatory, Malargüe |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-08-22.0000000 |
| e |
0.64812734 |
| q (au) |
1.817415 |
| a (au) |
5.164980 |
| i (deg) |
39.365304 |
| Ω (om, deg) |
49.200900 |
| ω (w, deg) |
0.816323 |
| M (ma, deg) |
293.601469 |
밝기
산란 + 전체 선형
$$
M_a = (15.177 + 2.625\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.177 |
| n |
2.625 |
| gf |
1.000 |
| gb |
-0.640 |
| k |
0.800 |
| 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 |
| 2024-07-05 |
2024-10-17 |
+24.0739 |
-6.359 |
| 2024-10-22 |
2025-04-19 |
-0.5771 |
+0.059 |
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 |
12:32:08.92 |
+34:28:33.0 |
HIP 61036 |
19.73 |
| 2026-05-12 12:00 |
12:31:55.42 |
+34:25:17.9 |
HIP 61036 |
17.69 |
| 2026-05-13 00:00 |
12:31:42.17 |
+34:22:01.2 |
HIP 61036 |
16.59 |
| 2026-05-13 12:00 |
12:31:29.15 |
+34:18:42.8 |
HIP 61036 |
16.60 |
| 2026-05-14 00:00 |
12:31:16.37 |
+34:15:22.9 |
HIP 61036 |
17.71 |
| 2026-05-14 12:00 |
12:31:03.83 |
+34:12:01.4 |
HIP 61036 |
19.73 |
| 2026-05-15 00:00 |
12:30:51.53 |
+34:08:38.4 |
HIP 61036 |
22.41 |
| 2026-05-15 12:00 |
12:30:39.47 |
+34:05:13.8 |
HIP 61039 |
20.29 |
| 2026-05-16 00:00 |
12:30:27.64 |
+34:01:47.8 |
HIP 61039 |
16.96 |
| 2026-05-16 12:00 |
12:30:16.06 |
+33:58:20.2 |
HIP 61039 |
14.08 |
| 2026-05-17 00:00 |
12:30:04.72 |
+33:54:51.2 |
HIP 61039 |
11.96 |
| 2026-05-17 12:00 |
12:29:53.63 |
+33:51:20.8 |
HIP 61039 |
11.04 |
| 2026-05-18 00:00 |
12:29:42.77 |
+33:47:49.0 |
HIP 61039 |
11.62 |
| 2026-05-18 12:00 |
12:29:32.15 |
+33:44:15.8 |
HIP 61039 |
13.48 |
| 2026-05-19 00:00 |
12:29:21.77 |
+33:40:41.2 |
HIP 61039 |
16.20 |
| 2026-05-19 12:00 |
12:29:11.64 |
+33:37:05.3 |
HIP 61039 |
19.40 |
| 2026-05-20 00:00 |
12:29:01.74 |
+33:33:28.1 |
HIP 61039 |
22.89 |
| 2026-05-20 12:00 |
12:28:52.08 |
+33:29:49.5 |
HIP 61039 |
26.55 |
| 2026-05-21 00:00 |
12:28:42.67 |
+33:26:09.8 |
HIP 61039 |
30.31 |
| 2026-05-21 12:00 |
12:28:33.49 |
+33:22:28.8 |
HIP 60887 |
27.14 |
| 2026-05-22 00:00 |
12:28:24.55 |
+33:18:46.5 |
HIP 60887 |
23.67 |
| 2026-05-22 12:00 |
12:28:15.85 |
+33:15:03.1 |
HIP 60887 |
20.42 |
| 2026-05-23 00:00 |
12:28:07.39 |
+33:11:18.5 |
HIP 60887 |
17.51 |
| 2026-05-23 12:00 |
12:27:59.17 |
+33:07:32.7 |
HIP 60887 |
15.14 |
| 2026-05-24 00:00 |
12:27:51.18 |
+33:03:45.9 |
HIP 60887 |
13.60 |
| 2026-05-24 12:00 |
12:27:43.43 |
+32:59:57.9 |
HIP 60887 |
13.17 |
| 2026-05-25 00:00 |
12:27:35.91 |
+32:56:08.8 |
HIP 60887 |
13.96 |
| 2026-05-25 12:00 |
12:27:28.63 |
+32:52:18.7 |
HIP 60887 |
15.78 |
| 2026-05-26 00:00 |
12:27:21.59 |
+32:48:27.5 |
HIP 60887 |
18.32 |
| 2026-05-26 12:00 |
12:27:14.77 |
+32:44:35.3 |
HIP 60887 |
21.34 |
| 2026-05-27 00:00 |
12:27:08.19 |
+32:40:42.1 |
HIP 60887 |
24.65 |
| 2026-05-27 12:00 |
12:27:01.84 |
+32:36:48.0 |
HIP 60887 |
28.15 |
| 2026-05-28 00:00 |
12:26:55.73 |
+32:32:52.9 |
HIP 60887 |
31.78 |
| 2026-05-28 12:00 |
12:26:49.84 |
+32:28:56.8 |
HIP 60887 |
35.50 |
| 2026-05-29 00:00 |
12:26:44.18 |
+32:24:59.8 |
HIP 60605 |
37.72 |
| 2026-05-29 12:00 |
12:26:38.75 |
+32:21:01.9 |
HIP 60605 |
33.71 |
| 2026-05-30 00:00 |
12:26:33.55 |
+32:17:03.2 |
HIP 60605 |
29.74 |
| 2026-05-30 12:00 |
12:26:28.57 |
+32:13:03.5 |
HIP 60605 |
25.83 |
| 2026-05-31 00:00 |
12:26:23.82 |
+32:09:03.0 |
HIP 60605 |
22.02 |
| 2026-05-31 12:00 |
12:26:19.30 |
+32:05:01.7 |
HIP 60605 |
18.37 |
| 2026-06-01 00:00 |
12:26:15.00 |
+32:00:59.6 |
HIP 60605 |
15.01 |
| 2026-06-01 12:00 |
12:26:10.93 |
+31:56:56.7 |
HIP 60605 |
12.17 |
| 2026-06-02 00:00 |
12:26:07.07 |
+31:52:53.0 |
HIP 60605 |
10.31 |