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油井 亀美也 Kimiya.Yui engagement report

@Astro_Kimiya - 258K followers on X

Measured over 15 original posts from a 30-day window, last computed on September 8, 2026.

Engagement

Top quarter for its size
Per follower
0.56%
of 258K followers
Per impression
3.96%
37K views on a typical post
Reach
14.1%
of its followers see a post
Typical post
1.4K
interactions (median)
Saved
0.055%
20 bookmarks on a typical post
Posting rate
0.5/day
active 50% of days
Peak time
08:00 UTC
Tuesday

A typical post picks up 1.4K interactions against 258K followers, an engagement rate of 0.56%. Measured over 15 original posts, its engagement rate beats 89% of 6,874 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 37K times each, and 3.96% of those impressions turn into an interaction. That is about 14.1% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.5 post a day over the last 30 days, with activity on roughly 50% of days. Most posts go out around 08:00 UTC, and Tuesday is the busiest day of the week. Of the 15 posts sampled, 60% carry an image or video and 7% link out. The account's strongest tracked post pulled 4.7K interactions, about 3.3x its own typical post.

Measured over 15 original posts from a 30-day window, last computed on September 8, 2026.

Compared with accounts its own size

油井 亀美也 Kimiya.Yui's engagement rate beats 89% of the tracked X accounts closest to it in follower count (6,874 accounts, accounts of similar size (decile 7 of 10)). A percentile is spread evenly by construction, so 50 really is the middle of that group and 90 really is its top tenth.

On engagement per impression rather than per follower it beats 84% of the same group. When those two numbers disagree, the gap is about how far its posts travel rather than how people react to them.

Where this sits in the catalog

At 0.56%, 油井 亀美也 Kimiya.Yui sits above the 75th percentile of the 65,980 accounts in this comparison. That places it in the top 25% band, which runs 0.499% to 2.09%.

p100.002%
p250.016%
p50 (median)0.1%
p750.499%
p902.09%
p99120.0%
Engagement rate as a share of followers, across the 65,980 accounts we have scanned enough to measure. The axis is logarithmic, because the top and bottom of this population are about 57,142 times apart and a linear axis would flatten everything below the median into a single point.
Show the percentile table
Engagement rate percentiles
PercentileEngagement rate
10th percentile0.002%
25th percentile0.016%
50th percentile0.1%
75th percentile0.499%
90th percentile2.09%
99th percentile120.0%

This ruler is the whole measured catalog, not a size-matched group: it shows where the raw rate falls across every account we can measure, all of which are large. For a like-for-like comparison, read the size-band percentile above instead. See how the bands are built

Posting timing

This account posts most often around 08:00 UTC, and Tuesday is its busiest day of the week. The bars below are the catalog-wide pattern, with this account's own busiest slot marked. They do not show how this account performs at each hour: we keep one aggregate per account, not one per hour, so that measurement does not exist in our data.

Engagement by hour posted, UTCTwenty-four bars, one per UTC hour. Each bar shows how posts published in that hour compare with their own authors' median engagement. Bars above the centre line ran higher than the median, bars below ran lower. A marker flags Busiest hour: 08:00 UTC.
0003060912151821
Above the authors' own mediansBelowScale: plus or minus 111%Busiest hour: 08:00 UTC
Show engagement by hour posted, utc as a table
Engagement by hour posted, UTC
Hour (UTC)Vs author medianPosts
00:00 UTC-1%89K
01:00 UTC-2%90K
02:00 UTC-3%88K
03:00 UTC-4%94K
04:00 UTC-5%76K
05:00 UTC-4%75K
06:00 UTC-5%86K
07:00 UTC-5%93K
08:00 UTC-4%108K
09:00 UTC-4%124K
10:00 UTC-3%129K
11:00 UTC-3%141K
12:00 UTC-3%154K
13:00 UTC-3%167K
14:00 UTC-4%173K
15:00 UTC-2%176K
16:00 UTC-3%171K
17:00 UTC-3%159K
18:00 UTC-2%149K
19:00 UTC-2%141K
20:00 UTC-1%131K
21:00 UTC0%116K
22:00 UTC-2%100K
23:00 UTC-1%90K
Engagement by day of weekSeven bars, one per weekday, Sunday first. Each bar shows how posts published on that day compare with their own authors' median engagement. Bars above the centre line ran higher than the median, bars below ran lower. A marker flags Busiest day: Tuesday.
SunMonTueWedThuFriSat
Above the authors' own mediansBelowScale: plus or minus 111%Busiest day: Tuesday
Show engagement by day of week as a table
Engagement by day of week
DayVs author medianPosts
Sunday+5%393K
Monday+1%483K
Tuesday-2%520K
Wednesday-3%472K
Thursday-2%430K
Friday-3%447K
Saturday+2%393K
See what moves engagement across the whole catalogWhat counts as a good engagement rate at this size

Formats this account uses

Its own posting mix on the left, and what each of those formats does across every account we track on the right. Only formats where the effect clears our publish test appear here, so an empty row is a format we could not measure rather than one that does nothing.

This account's posting mix compared with catalog-wide effects
FormatThis accountCatalog effect95% intervalAccounts behind it
Image or video60% of posts+111%+108% to +115%34K
Outbound link7% of posts-41%-42% to -40%32K
Typical length--3%-3% to -2%54K
  • 60% of this account's sampled posts carry an image or video. Across the catalog, posts with an image or video run 111% above the same accounts' other posts.
  • 7% of its posts carry a link off X. Across the catalog, posts with an outbound link run 41% below the same accounts' other posts.
  • Its average post runs 140 characters, which falls in the 80 - 180 characters band. Across the catalog, posts of 80 to 180 characters run 3% below the same accounts' other posts.

These are catalog-wide differences applied to this account's own posting mix, not a measurement of how each format performs for this account specifically. We keep one median per account, not one per format per account, so the second thing is not something this data can tell you.

Best tweets

  • Aug 7, 20263.3x their median

    皆さん、こんばんは! 今日家に帰ると、愛犬のくま吉君が夏らしいスタイルにカットされていました。 という事で、動画を共有させていただきます! https://t.co/k2ldwA6O9L

    4.5K18844862K viewsView on X
  • Jul 8, 20262.9x their median

    皆さん、こんばんは! 宇宙ステーション長期滞在後は、滞在中にお休みできなかった分の休暇が取得できる事になっています。 という事で、私も今日から少し長めのお休みを頂く予定です。 何をしようかと、今から楽しみです! 休暇中は、ポストも少なくなると思いますが、ご容赦ください。

    4.1K12149180K viewsView on X
  • Sep 1, 20262.7x their median

    秋山豊寛さんが亡くなられたのですね。。 ソユーズ宇宙船で宇宙へ行くための訓練を受け、宇宙でジャーナリストとして活動するという、世界初の偉業を成し遂げた方として、宇宙開発の歴史に名を刻んでいます。今考えても、かなり先進的な活動ですね。 心より御冥福をお祈り申し上げます。

    3.5K34612464K viewsView on X
  • Jul 1, 20262.3x their median

    皆さん、こんばんは! 仕事を終えて家に帰ると、いつもこの顔が待っていて疲れが吹き飛びます笑。 くまちゃん、癒しをありがとう! https://t.co/764K4RcBL5

    3.2K13735346K viewsView on X
  • Jul 6, 20262.3x their median

    皆さん、こんばんは! 今日は、サラダ記念日ですね。 国語の成績が3だった(10段階評価)私が、この日に短歌を詠むのは、とても勇気がいるのです(笑)。 「富士さんの衣装みながら独り言私の為のおめかしですね」 #MyEarth短歌 https://t.co/ekjETHqdu9

    3.1K185379146K viewsView on X
  • Aug 5, 20261.9x their median

    皆さん、おはようございます! 恥ずかしながら、夏風邪をひいて、お休みをいただいていました。 今日は、久しぶりに筑波宇宙センターへ出勤です! 今週末は、富山県と福島県で講演が予定されていますが、元気になりましたので、安心してくださいね! 皆様方との交流を楽しみにしています! https://t.co/KlUbsNg3OM

    2.6K10332253K viewsView on X
  • Jun 19, 20261.9x their median

    皆さん、こんばんは! 久しぶりに家に帰ると、くま吉が大歓迎して迎えてくれました。 家はいいですね。 https://t.co/FUYNvd4igV

    2.6K10636437K viewsView on X
  • Aug 25, 20261.8x their median

    皆さん、こんばんは! ISSから撮影した何十万枚もの写真ですが、少しづつ整理して皆さんに紹介する事にしました。こちらは、今年の1月2日に撮影した写真です。 そこで問題! この写真に写っている星座は? ヒント:黄道光が写っていますね。日没直後の写真で、この光の中には、冬生まれの方の星占いの星座が。 (答え合わせの期待度が高ければ、画伯が登場するかも?笑)

    2.4K14945949K viewsView on X
  • Sep 4, 20261.8x their median

    皆さん、こんにちは! 飛行機の乗り継ぎ待ちの間に、今自分がいる場所と、最初の目的地を宇宙からの写真で確認しました笑。 ミュンヘンがここで、ヴェローナがここ(写真の編集ができないので、答えを示せずに申し訳ありません)。 https://t.co/np5xpVf074

    2.4K15229349K viewsView on X
  • Aug 31, 20261.7x their median

    皆さん、こんばんは! 今日は、とても短いタイムラプスの紹介です。 昇る北極星を見つけてみてください。 画面の左端に写っているカシオペヤ座を参考にすると良いかもしれません。 中央やや右の北斗七星の一部も参考になるかも。 https://t.co/zfpR5obB4D

    2.3K22325447K viewsView on X

Ranked by total interactions across everything we have tracked for this account, which is a longer history than the 30-day window the rates above use. The multiple compares each post to this account's own median.

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Reading these numbers

A typical post picks up 1.4K interactions against 258K followers, an engagement rate of 0.56%. Measured over 15 original posts, its engagement rate beats 89% of 6,874 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 37K times each, and 3.96% of those impressions turn into an interaction. That is about 14.1% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.5 post a day over the last 30 days, with activity on roughly 50% of days. Most posts go out around 08:00 UTC, and Tuesday is the busiest day of the week. Of the 15 posts sampled, 60% carry an image or video and 7% link out. The account's strongest tracked post pulled 4.7K interactions, about 3.3x its own typical post.

What is 油井 亀美也 Kimiya.Yui's engagement rate on X?
油井 亀美也 Kimiya.Yui (@Astro_Kimiya) has an engagement rate of 0.56%, based on the median interactions across 15 original posts from the last 30 days against 258,368 followers. Replies, reposts and quote-posts of other people are excluded from that sample.
Is that a good engagement rate?
At 0.56%, 油井 亀美也 Kimiya.Yui sits above the 75th percentile of the 65,980 accounts in this comparison. Those comparison accounts are all large ones, because our scanning cadence is weighted towards big accounts, so this is a ranking among peers of similar scale rather than a ranking across X.
Does @Astro_Kimiya have real engagement?
Its engagement rate beats 89% of the tracked X accounts closest to it in follower count (6,874 accounts), which puts it in the top quarter for its size group. Ranking inside a size band matters because engagement rate falls as accounts grow, so a raw rate would mostly re-measure the follower count. It is a starting point for a look at follower quality, not a verdict on it.
When does @Astro_Kimiya post?
Most posts go out around 08:00 UTC, and Tuesday is its busiest day, at roughly 0.5 posts per day across the measured window.

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