메타데이터
| 항목 |
값 |
| Designation |
C/2015 O1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-19T00:42:22.034880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
3677 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-02-12.0000000 |
| e |
0.99999427 |
| q (au) |
3.729638 |
| a (au) |
651202.297761 |
| i (deg) |
127.211078 |
| Ω (om, deg) |
299.855849 |
| ω (w, deg) |
89.593861 |
| M (ma, deg) |
360.000000 |
밝기
산란 + 전체 선형
$$
M_a = (7.999 + 2.835\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.999 |
| n |
2.835 |
| gf |
0.898 |
| gb |
-0.500 |
| k |
0.965 |
| δ90 |
1.020 |
| 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 |
| 2015-06-15 |
2017-06-06 |
-1.5915 |
+0.977 |
| 2017-06-06 |
2018-02-18 |
+13.0862 |
-8.231 |
| 2018-02-21 |
2020-03-20 |
+2.8414 |
-2.032 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:10:42.92 |
-04:55:26.8 |
HIP 29358 |
12.04 |
| 2026-06-01 12:00 |
06:10:47.60 |
-04:55:21.4 |
HIP 29358 |
11.29 |
| 2026-06-02 00:00 |
06:10:52.28 |
-04:55:16.4 |
HIP 29358 |
10.61 |
| 2026-06-02 12:00 |
06:10:56.99 |
-04:55:11.7 |
HIP 29358 |
10.02 |
| 2026-06-03 00:00 |
06:11:01.71 |
-04:55:07.3 |
HIP 29358 |
9.53 |
| 2026-06-03 12:00 |
06:11:06.44 |
-04:55:03.2 |
HIP 29358 |
9.16 |
| 2026-06-04 00:00 |
06:11:11.18 |
-04:54:59.4 |
HIP 29358 |
8.92 |
| 2026-06-04 12:00 |
06:11:15.94 |
-04:54:56.0 |
HIP 29358 |
8.83 |
| 2026-06-05 00:00 |
06:11:20.72 |
-04:54:52.8 |
HIP 29358 |
8.90 |
| 2026-06-05 12:00 |
06:11:25.50 |
-04:54:50.0 |
HIP 29358 |
9.12 |
| 2026-06-06 00:00 |
06:11:30.30 |
-04:54:47.5 |
HIP 29358 |
9.48 |
| 2026-06-06 12:00 |
06:11:35.11 |
-04:54:45.4 |
HIP 29358 |
9.96 |
| 2026-06-07 00:00 |
06:11:39.94 |
-04:54:43.5 |
HIP 29358 |
10.56 |
| 2026-06-07 12:00 |
06:11:44.77 |
-04:54:42.0 |
HIP 29358 |
11.25 |
| 2026-06-08 00:00 |
06:11:49.62 |
-04:54:40.8 |
HIP 29358 |
12.03 |
| 2026-06-08 12:00 |
06:11:54.47 |
-04:54:40.0 |
HIP 29358 |
12.86 |
| 2026-06-09 00:00 |
06:11:59.34 |
-04:54:39.5 |
HIP 29358 |
13.75 |
| 2026-06-09 12:00 |
06:12:04.22 |
-04:54:39.2 |
HIP 29513 |
14.67 |
| 2026-06-10 00:00 |
06:12:09.11 |
-04:54:39.4 |
HIP 29513 |
13.46 |
| 2026-06-10 12:00 |
06:12:14.01 |
-04:54:39.8 |
HIP 29513 |
12.24 |
| 2026-06-11 00:00 |
06:12:18.92 |
-04:54:40.6 |
HIP 29513 |
11.03 |
| 2026-06-11 12:00 |
06:12:23.83 |
-04:54:41.7 |
HIP 29513 |
9.81 |
| 2026-06-12 00:00 |
06:12:28.76 |
-04:54:43.1 |
HIP 29513 |
8.60 |
| 2026-06-12 12:00 |
06:12:33.69 |
-04:54:44.9 |
HIP 29513 |
7.38 |
| 2026-06-13 00:00 |
06:12:38.63 |
-04:54:47.0 |
HIP 29513 |
6.17 |
| 2026-06-13 12:00 |
06:12:43.58 |
-04:54:49.4 |
HIP 29513 |
4.96 |
| 2026-06-14 00:00 |
06:12:48.54 |
-04:54:52.2 |
HIP 29513 |
3.77 |
| 2026-06-14 12:00 |
06:12:53.50 |
-04:54:55.3 |
HIP 29513 |
2.61 |
| 2026-06-15 00:00 |
06:12:58.47 |
-04:54:58.7 |
HIP 29513 |
1.57 |
| 2026-06-15 12:00 |
06:13:03.45 |
-04:55:02.4 |
HIP 29513 |
1.08 |
| 2026-06-16 00:00 |
06:13:08.43 |
-04:55:06.5 |
HIP 29513 |
1.72 |
| 2026-06-16 12:00 |
06:13:13.41 |
-04:55:11.0 |
HIP 29513 |
2.80 |
| 2026-06-17 00:00 |
06:13:18.41 |
-04:55:15.7 |
HIP 29513 |
3.97 |
| 2026-06-17 12:00 |
06:13:23.40 |
-04:55:20.8 |
HIP 29513 |
5.18 |
| 2026-06-18 00:00 |
06:13:28.40 |
-04:55:26.2 |
HIP 29513 |
6.41 |
| 2026-06-18 12:00 |
06:13:33.40 |
-04:55:32.0 |
HIP 29526 |
7.24 |
| 2026-06-19 00:00 |
06:13:38.41 |
-04:55:38.0 |
HIP 29526 |
8.12 |
| 2026-06-19 12:00 |
06:13:43.42 |
-04:55:44.5 |
HIP 29526 |
9.08 |
| 2026-06-20 00:00 |
06:13:48.43 |
-04:55:51.2 |
HIP 29526 |
10.11 |
| 2026-06-20 12:00 |
06:13:53.45 |
-04:55:58.3 |
HIP 29526 |
11.18 |
| 2026-06-21 00:00 |
06:13:58.46 |
-04:56:05.7 |
HIP 29526 |
12.28 |
| 2026-06-21 12:00 |
06:14:03.48 |
-04:56:13.4 |
HIP 29526 |
13.41 |
| 2026-06-22 00:00 |
06:14:08.50 |
-04:56:21.5 |
HIP 29526 |
14.56 |